fix(sdk): infer ToolResponse.Type for binary data in NewTool/NewParallelTool

- Infer Type="image" for image/* MIME types and Type="media" for all other binary content so the downstream framework creates a media content block instead of silently discarding Data bytes (#17) - Extract shared toolOutputToResponse() helper to eliminate duplication - Add ImageResult() and MediaResult() convenience constructors - Add LLMToolCall and LLMToolResponse type aliases so SDK consumers can call Tool.Run() without importing the underlying framework - Add 6 regression tests covering image, media, and text responses Closes #17
perf(session,ui): reduce syscalls, allocations, and subprocess spam
2026-06-20 22:26:17 +00:00 · 2026-04-22 16:58:07 +03:00 · 2026-04-22 16:48:17 +03:00 · 2026-04-22 13:06:37 +03:00 · 2026-04-22 11:56:06 +03:00 · 2026-04-22 11:55:40 +03:00
26 changed files with 930 additions and 255 deletions
@@ -1,8 +0,0 @@
-{
-  "$schema": "https://opencode.ai/config.json",
-  "permission": {
-    "external_directory": {
-      "~/go/**": "deny"
-    }
-  }
-}
@@ -646,7 +646,28 @@ host, _ := kit.New(ctx, &kit.Options{
 })
 ```

-Use `kit.NewParallelTool` for tools safe to run concurrently. See the [SDK docs](/sdk/overview) for full details on struct tags, `ToolOutput` fields, and `ToolCallIDFromContext`.
+Use `kit.NewParallelTool` for tools safe to run concurrently. Binary data (images, audio, etc.) in `ToolOutput.Data` is automatically forwarded to the LLM when `MediaType` is set. See the [SDK docs](/sdk/overview) for full details on struct tags, `ToolOutput` fields, and `ToolCallIDFromContext`.
+
+#### Return Helpers
+
+| Helper | Description |
+| --- | --- |
+| `kit.TextResult(content)` | Successful text result |
+| `kit.ErrorResult(content)` | Error result (LLM sees it as a tool error) |
+| `kit.ImageResult(content, data, mediaType)` | Image result with binary data (e.g. `"image/png"`) |
+| `kit.MediaResult(content, data, mediaType)` | Non-image media result (e.g. `"audio/mpeg"`) |
+
+#### ToolOutput Fields
+
+```go
+kit.ToolOutput{
+    Content:   "result text",     // text returned to the LLM
+    IsError:   false,             // true = LLM sees this as an error
+    Data:      pngBytes,          // optional binary data (images, audio)
+    MediaType: "image/png",       // MIME type for binary Data
+    Metadata:  map[string]any{},  // opaque metadata for hooks/UI (not sent to LLM)
+}
+```

 ### With Callbacks

@@ -4,8 +4,8 @@ go 1.26.2

 require (
 	charm.land/bubbles/v2 v2.1.0
-	charm.land/bubbletea/v2 v2.0.5
-	charm.land/fantasy v0.17.2
+	charm.land/bubbletea/v2 v2.0.6
+	charm.land/fantasy v0.19.0
 	charm.land/huh/v2 v2.0.3
 	charm.land/lipgloss/v2 v2.0.3
 	github.com/alecthomas/chroma/v2 v2.23.1
@@ -14,15 +14,15 @@ require (
 	github.com/charmbracelet/fang v1.0.0
 	github.com/charmbracelet/log v1.0.0
 	github.com/charmbracelet/openai-go v0.0.0-20260319145158-d0740cc34266
-	github.com/charmbracelet/ultraviolet v0.0.0-20260414011438-8c69ec811b1e
+	github.com/charmbracelet/ultraviolet v0.0.0-20260420095748-421e4a7fa8d7
 	github.com/charmbracelet/x/editor v0.2.0
 	github.com/clipperhouse/displaywidth v0.11.0
 	github.com/clipperhouse/uax29/v2 v2.7.0
-	github.com/coder/acp-go-sdk v0.6.3
+	github.com/coder/acp-go-sdk v0.12.0
 	github.com/fsnotify/fsnotify v1.9.0
 	github.com/indaco/herald v0.13.0
 	github.com/indaco/herald-md v0.3.0
-	github.com/mark3labs/mcp-go v0.48.0
+	github.com/mark3labs/mcp-go v0.49.0
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/viper v1.21.0
 	github.com/traefik/yaegi v0.16.1
@@ -35,23 +35,23 @@ require (
 	cloud.google.com/go/auth v0.20.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/compute/metadata v0.9.0 // indirect
-	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.1 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.12.0 // indirect
-	github.com/aws/aws-sdk-go-v2 v1.41.5 // indirect
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.8 // indirect
-	github.com/aws/aws-sdk-go-v2/config v1.32.14 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.19.14 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.21 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.21 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.21 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.6 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.7 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.21 // indirect
-	github.com/aws/aws-sdk-go-v2/service/signin v1.0.9 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.30.15 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.19 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.41.10 // indirect
-	github.com/aws/smithy-go v1.24.3 // indirect
+	github.com/aws/aws-sdk-go-v2 v1.41.6 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.9 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.32.16 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.19.15 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.22 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.22 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.22 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.23 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.8 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.22 // indirect
+	github.com/aws/aws-sdk-go-v2/service/signin v1.0.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.30.16 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.20 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.42.0 // indirect
+	github.com/aws/smithy-go v1.25.0 // indirect
 	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/charmbracelet/anthropic-sdk-go v0.0.0-20260223140439-63879b0b8dab // indirect
@@ -59,14 +59,14 @@ require (
 	github.com/charmbracelet/harmonica v0.2.0 // indirect
 	github.com/charmbracelet/lipgloss v1.1.1-0.20250404203927-76690c660834 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
-	github.com/charmbracelet/x/exp/charmtone v0.0.0-20260413165052-6921c759c913 // indirect
+	github.com/charmbracelet/x/exp/charmtone v0.0.0-20260420102150-fe550f2efce5 // indirect
 	github.com/charmbracelet/x/exp/ordered v0.1.0 // indirect
-	github.com/charmbracelet/x/exp/slice v0.0.0-20260413165052-6921c759c913 // indirect
+	github.com/charmbracelet/x/exp/slice v0.0.0-20260420102150-fe550f2efce5 // indirect
 	github.com/charmbracelet/x/exp/strings v0.1.0 // indirect
 	github.com/charmbracelet/x/json v0.2.0 // indirect
 	github.com/charmbracelet/x/termios v0.1.1 // indirect
 	github.com/charmbracelet/x/windows v0.2.2 // indirect
-	github.com/dlclark/regexp2 v1.11.5 // indirect
+	github.com/dlclark/regexp2 v1.12.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-json-experiment/json v0.0.0-20260214004413-d219187c3433 // indirect
@@ -79,13 +79,13 @@ require (
 	github.com/google/jsonschema-go v0.4.2 // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.14 // indirect
-	github.com/googleapis/gax-go/v2 v2.21.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.15 // indirect
+	github.com/googleapis/gax-go/v2 v2.22.0 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
-	github.com/kaptinlin/go-i18n v0.4.0 // indirect
-	github.com/kaptinlin/jsonpointer v0.4.17 // indirect
-	github.com/kaptinlin/jsonschema v0.7.7 // indirect
-	github.com/kaptinlin/messageformat-go v0.4.20 // indirect
+	github.com/kaptinlin/go-i18n v0.4.2 // indirect
+	github.com/kaptinlin/jsonpointer v0.4.18 // indirect
+	github.com/kaptinlin/jsonschema v0.7.8 // indirect
+	github.com/kaptinlin/messageformat-go v0.5.2 // indirect
 	github.com/mitchellh/hashstructure/v2 v2.0.2 // indirect
 	github.com/muesli/mango v0.2.0 // indirect
 	github.com/muesli/mango-cobra v1.3.0 // indirect
@@ -115,9 +115,9 @@ require (
 	golang.org/x/net v0.53.0 // indirect
 	golang.org/x/oauth2 v0.36.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
-	google.golang.org/api v0.275.0 // indirect
+	google.golang.org/api v0.276.0 // indirect
 	google.golang.org/genai v1.54.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260420184626-e10c466a9529 // indirect
 	google.golang.org/grpc v1.80.0 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
@@ -134,7 +134,7 @@ require (
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/spf13/pflag v1.0.10 // indirect
+	github.com/spf13/pflag v1.0.10
 	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.43.0 // indirect
 	golang.org/x/text v0.36.0
@@ -1,9 +1,9 @@
 charm.land/bubbles/v2 v2.1.0 h1:YSnNh5cPYlYjPxRrzs5VEn3vwhtEn3jVGRBT3M7/I0g=
 charm.land/bubbles/v2 v2.1.0/go.mod h1:l97h4hym2hvWBVfmJDtrEHHCtkIKeTEb3TTJ4ZOB3wY=
-charm.land/bubbletea/v2 v2.0.5 h1:TQlLFqxo39AAHSVuOhJ5D3nH7O9Nk8JGinsfWQ4y1U4=
-charm.land/bubbletea/v2 v2.0.5/go.mod h1:dvbsYZD+MHkdIZl+Z67D212hEvB+GII2tfH8f9SnoDw=
-charm.land/fantasy v0.17.2 h1:ojTMufMxY/PVH7TzYUxht2SVkvD90iCTJfmPR6c8BR8=
-charm.land/fantasy v0.17.2/go.mod h1:V9cCIUMZB9g3Bq40aKEY8xBNzDd48EdfHp2OMS0uzWs=
+charm.land/bubbletea/v2 v2.0.6 h1:UHN/91OyuhaOFGSrBXQ/hMZD8IO1Uc4BvHlgHXL2WJo=
+charm.land/bubbletea/v2 v2.0.6/go.mod h1:MH/D8ZLlN3op37vQvijKuU29g3rqTp+aQapURFonF9g=
+charm.land/fantasy v0.19.0 h1:fnNXkIJ/xcIW3sdVtWxjtQGpWWe8pDGhBCWSHkgbrd0=
+charm.land/fantasy v0.19.0/go.mod h1:V9cCIUMZB9g3Bq40aKEY8xBNzDd48EdfHp2OMS0uzWs=
 charm.land/huh/v2 v2.0.3 h1:2cJsMqEPwSywGHvdlKsJyQKPtSJLVnFKyFbsYZTlLkU=
 charm.land/huh/v2 v2.0.3/go.mod h1:93eEveeeqn47MwiC3tf+2atZ2l7Is88rAtmZNZ8x9Wc=
 charm.land/lipgloss/v2 v2.0.3 h1:yM2zJ4Cf5Y51b7RHIwioil4ApI/aypFXXVHSwlM6RzU=
@@ -16,8 +16,8 @@ cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIi
 cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c=
 cloud.google.com/go/compute/metadata v0.9.0 h1:pDUj4QMoPejqq20dK0Pg2N4yG9zIkYGdBtwLoEkH9Zs=
 cloud.google.com/go/compute/metadata v0.9.0/go.mod h1:E0bWwX5wTnLPedCKqk3pJmVgCBSM6qQI1yTBdEb3C10=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0 h1:fou+2+WFTib47nS+nz/ozhEBnvU96bKHy6LjRsY4E28=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0/go.mod h1:t76Ruy8AHvUAC8GfMWJMa0ElSbuIcO03NLpynfbgsPA=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.1 h1:jHb/wfvRikGdxMXYV3QG/SzUOPYN9KEUUuC0Yd0/vC0=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.1/go.mod h1:pzBXCYn05zvYIrwLgtK8Ap8QcjRg+0i76tMQdWN6wOk=
 github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1 h1:Hk5QBxZQC1jb2Fwj6mpzme37xbCDdNTxU7O9eb5+LB4=
 github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1/go.mod h1:IYus9qsFobWIc2YVwe/WPjcnyCkPKtnHAqUYeebc8z0=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.12.0 h1:fhqpLE3UEXi9lPaBRpQ6XuRW0nU7hgg4zlmZZa+a9q4=
@@ -34,36 +34,36 @@ github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs
 github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
 github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
-github.com/aws/aws-sdk-go-v2 v1.41.5 h1:dj5kopbwUsVUVFgO4Fi5BIT3t4WyqIDjGKCangnV/yY=
-github.com/aws/aws-sdk-go-v2 v1.41.5/go.mod h1:mwsPRE8ceUUpiTgF7QmQIJ7lgsKUPQOUl3o72QBrE1o=
-github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.8 h1:eBMB84YGghSocM7PsjmmPffTa+1FBUeNvGvFou6V/4o=
-github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.8/go.mod h1:lyw7GFp3qENLh7kwzf7iMzAxDn+NzjXEAGjKS2UOKqI=
-github.com/aws/aws-sdk-go-v2/config v1.32.14 h1:opVIRo/ZbbI8OIqSOKmpFaY7IwfFUOCCXBsUpJOwDdI=
-github.com/aws/aws-sdk-go-v2/config v1.32.14/go.mod h1:U4/V0uKxh0Tl5sxmCBZ3AecYny4UNlVmObYjKuuaiOo=
-github.com/aws/aws-sdk-go-v2/credentials v1.19.14 h1:n+UcGWAIZHkXzYt87uMFBv/l8THYELoX6gVcUvgl6fI=
-github.com/aws/aws-sdk-go-v2/credentials v1.19.14/go.mod h1:cJKuyWB59Mqi0jM3nFYQRmnHVQIcgoxjEMAbLkpr62w=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.21 h1:NUS3K4BTDArQqNu2ih7yeDLaS3bmHD0YndtA6UP884g=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.21/go.mod h1:YWNWJQNjKigKY1RHVJCuupeWDrrHjRqHm0N9rdrWzYI=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.21 h1:Rgg6wvjjtX8bNHcvi9OnXWwcE0a2vGpbwmtICOsvcf4=
-github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.21/go.mod h1:A/kJFst/nm//cyqonihbdpQZwiUhhzpqTsdbhDdRF9c=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.21 h1:PEgGVtPoB6NTpPrBgqSE5hE/o47Ij9qk/SEZFbUOe9A=
-github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.21/go.mod h1:p+hz+PRAYlY3zcpJhPwXlLC4C+kqn70WIHwnzAfs6ps=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.8.6 h1:qYQ4pzQ2Oz6WpQ8T3HvGHnZydA72MnLuFK9tJwmrbHw=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.8.6/go.mod h1:O3h0IK87yXci+kg6flUKzJnWeziQUKciKrLjcatSNcY=
-github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.7 h1:5EniKhLZe4xzL7a+fU3C2tfUN4nWIqlLesfrjkuPFTY=
-github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.7/go.mod h1:x0nZssQ3qZSnIcePWLvcoFisRXJzcTVvYpAAdYX8+GI=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.21 h1:c31//R3xgIJMSC8S6hEVq+38DcvUlgFY0FM6mSI5oto=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.21/go.mod h1:r6+pf23ouCB718FUxaqzZdbpYFyDtehyZcmP5KL9FkA=
-github.com/aws/aws-sdk-go-v2/service/signin v1.0.9 h1:QKZH0S178gCmFEgst8hN0mCX1KxLgHBKKY/CLqwP8lg=
-github.com/aws/aws-sdk-go-v2/service/signin v1.0.9/go.mod h1:7yuQJoT+OoH8aqIxw9vwF+8KpvLZ8AWmvmUWHsGQZvI=
-github.com/aws/aws-sdk-go-v2/service/sso v1.30.15 h1:lFd1+ZSEYJZYvv9d6kXzhkZu07si3f+GQ1AaYwa2LUM=
-github.com/aws/aws-sdk-go-v2/service/sso v1.30.15/go.mod h1:WSvS1NLr7JaPunCXqpJnWk1Bjo7IxzZXrZi1QQCkuqM=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.19 h1:dzztQ1YmfPrxdrOiuZRMF6fuOwWlWpD2StNLTceKpys=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.19/go.mod h1:YO8TrYtFdl5w/4vmjL8zaBSsiNp3w0L1FfKVKenZT7w=
-github.com/aws/aws-sdk-go-v2/service/sts v1.41.10 h1:p8ogvvLugcR/zLBXTXrTkj0RYBUdErbMnAFFp12Lm/U=
-github.com/aws/aws-sdk-go-v2/service/sts v1.41.10/go.mod h1:60dv0eZJfeVXfbT1tFJinbHrDfSJ2GZl4Q//OSSNAVw=
-github.com/aws/smithy-go v1.24.3 h1:XgOAaUgx+HhVBoP4v8n6HCQoTRDhoMghKqw4LNHsDNg=
-github.com/aws/smithy-go v1.24.3/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=
+github.com/aws/aws-sdk-go-v2 v1.41.6 h1:1AX0AthnBQzMx1vbmir3Y4WsnJgiydmnJjiLu+LvXOg=
+github.com/aws/aws-sdk-go-v2 v1.41.6/go.mod h1:dy0UzBIfwSeot4grGvY1AqFWN5zgziMmWGzysDnHFcQ=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.9 h1:adBsCIIpLbLmYnkQU+nAChU5yhVTvu5PerROm+/Kq2A=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.9/go.mod h1:uOYhgfgThm/ZyAuJGNQ5YgNyOlYfqnGpTHXvk3cpykg=
+github.com/aws/aws-sdk-go-v2/config v1.32.16 h1:Q0iQ7quUgJP0F/SCRTieScnaMdXr9h/2+wze1u3cNeM=
+github.com/aws/aws-sdk-go-v2/config v1.32.16/go.mod h1:duCCnJEFqpt2RC6no1iK6q+8HpwOAkiUua0pY507dQc=
+github.com/aws/aws-sdk-go-v2/credentials v1.19.15 h1:fyvgWTszojq8hEnMi8PPBTvZdTtEVmAVyo+NFLHBhH4=
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 github.com/mattn/go-runewidth v0.0.23 h1:7ykA0T0jkPpzSvMS5i9uoNn2Xy3R383f9HDx3RybWcw=
@@ -310,16 +310,16 @@ golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
 golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
-google.golang.org/api v0.275.0 h1:vfY5d9vFVJeWEZT65QDd9hbndr7FyZ2+6mIzGAh71NI=
-google.golang.org/api v0.275.0/go.mod h1:Fnag/EWUPIcJXuIkP1pjoTgS5vdxlk3eeemL7Do6bvw=
+google.golang.org/api v0.276.0 h1:nVArUtfLEihtW+b0DdcqRGK1xoEm2+ltAihyztq7MKY=
+google.golang.org/api v0.276.0/go.mod h1:Fnag/EWUPIcJXuIkP1pjoTgS5vdxlk3eeemL7Do6bvw=
 google.golang.org/genai v1.54.0 h1:ZQCa70WMTJDI11FdqWCzGvZ5PanpcpfoO6jl/lrSnGU=
 google.golang.org/genai v1.54.0/go.mod h1:A3kkl0nyBjyFlNjgxIwKq70julKbIxpSxqKO5gw/gmk=
 google.golang.org/genproto v0.0.0-20260406210006-6f92a3bedf2d h1:N1Ec54vZnIPd7MnxRiYLW+oY4fDR4BOS/LrssdD9+ek=
 google.golang.org/genproto v0.0.0-20260406210006-6f92a3bedf2d/go.mod h1:c2hJ1grtnH0xUiEKGDGkjGNTJ1Hy2LrblyKOHF0sqRM=
 google.golang.org/genproto/googleapis/api v0.0.0-20260406210006-6f92a3bedf2d h1:/aDRtSZJjyLQzm75d+a1wOJaqyKBMvIAfeQmoa3ORiI=
 google.golang.org/genproto/googleapis/api v0.0.0-20260406210006-6f92a3bedf2d/go.mod h1:etfGUgejTiadZAUaEP14NP97xi1RGeawqkjDARA/UOs=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 h1:RmoJA1ujG+/lRGNfUnOMfhCy5EipVMyvUE+KNbPbTlw=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260420184626-e10c466a9529 h1:XF8+t6QQiS0o9ArVan/HW8Q7cycNPGsJf6GA2nXxYAg=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260420184626-e10c466a9529/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
 google.golang.org/grpc v1.80.0 h1:Xr6m2WmWZLETvUNvIUmeD5OAagMw3FiKmMlTdViWsHM=
 google.golang.org/grpc v1.80.0/go.mod h1:ho/dLnxwi3EDJA4Zghp7k2Ec1+c2jqup0bFkw07bwF4=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
@@ -177,22 +177,55 @@ func (a *Agent) SetSessionMode(_ context.Context, _ acp.SetSessionModeRequest) (
 	return acp.SetSessionModeResponse{}, nil
 }

-// SetSessionModel changes the active model for a session.
-func (a *Agent) SetSessionModel(ctx context.Context, params acp.SetSessionModelRequest) (acp.SetSessionModelResponse, error) {
-	sessionID := string(params.SessionId)
+// ListSessions returns an empty session list. Kit doesn't persist sessions
+// across restarts in ACP mode, so this is effectively a no-op.
+func (a *Agent) ListSessions(_ context.Context, _ acp.ListSessionsRequest) (acp.ListSessionsResponse, error) {
+	return acp.ListSessionsResponse{
+		Sessions: []acp.SessionInfo{},
+	}, nil
+}
+
+// SetSessionConfigOption handles session configuration changes. Currently
+// supports the "model" config option to change the active model for a session.
+func (a *Agent) SetSessionConfigOption(ctx context.Context, params acp.SetSessionConfigOptionRequest) (acp.SetSessionConfigOptionResponse, error) {
+	// Extract session ID and config ID from whichever variant is present.
+	var sessionID string
+	var configID string
+	var value string
+
+	switch {
+	case params.ValueId != nil:
+		sessionID = string(params.ValueId.SessionId)
+		configID = string(params.ValueId.ConfigId)
+		value = string(params.ValueId.Value)
+	case params.Boolean != nil:
+		sessionID = string(params.Boolean.SessionId)
+		configID = string(params.Boolean.ConfigId)
+		// Boolean config options are not used for model selection.
+		log.Debug("acp: set_session_config_option (boolean)", "session", sessionID, "config", configID, "value", params.Boolean.Value)
+		return acp.SetSessionConfigOptionResponse{}, nil
+	default:
+		return acp.SetSessionConfigOptionResponse{}, acp.NewInvalidParams("unsupported config option variant")
+	}
+
 	sess, ok := a.registry.get(sessionID)
 	if !ok {
-		return acp.SetSessionModelResponse{}, acp.NewInvalidParams(fmt.Sprintf("session not found: %s", sessionID))
+		return acp.SetSessionConfigOptionResponse{}, acp.NewInvalidParams(fmt.Sprintf("session not found: %s", sessionID))
 	}

-	modelID := string(params.ModelId)
-	log.Debug("acp: set_session_model", "session", sessionID, "model", modelID)
+	log.Debug("acp: set_session_config_option", "session", sessionID, "config", configID, "value", value)

-	if err := sess.kit.SetModel(ctx, modelID); err != nil {
-		return acp.SetSessionModelResponse{}, fmt.Errorf("set model: %w", err)
+	// Handle known config options.
+	switch configID {
+	case "model":
+		if err := sess.kit.SetModel(ctx, value); err != nil {
+			return acp.SetSessionConfigOptionResponse{}, fmt.Errorf("set model: %w", err)
+		}
+	default:
+		log.Debug("acp: unknown config option", "config", configID)
 	}

-	return acp.SetSessionModelResponse{}, nil
+	return acp.SetSessionConfigOptionResponse{}, nil
 }

 // ---------------------------------------------------------------------------
@@ -63,6 +63,11 @@ type TreeManager struct {

 	// file is the open file handle for appending entries. Nil for in-memory.
 	file *os.File
+
+	// writer is a buffered writer wrapping file. Writes go through this
+	// buffer and are flushed to disk at explicit sync points (after each
+	// public Append* call, in Close, etc.) to reduce syscall overhead.
+	writer *bufio.Writer
 }

 // --- Constructors ---
@@ -105,11 +110,16 @@ func CreateTreeSession(cwd string) (*TreeManager, error) {
 		return nil, fmt.Errorf("failed to create session file: %w", err)
 	}
 	tm.file = f
+	tm.writer = bufio.NewWriter(f)

 	if err := tm.writeEntry(&header); err != nil {
 		_ = f.Close()
 		return nil, fmt.Errorf("failed to write session header: %w", err)
 	}
+	if err := tm.flushLocked(); err != nil {
+		_ = f.Close()
+		return nil, fmt.Errorf("failed to flush session header: %w", err)
+	}

 	return tm, nil
 }
@@ -150,6 +160,7 @@ func (tm *TreeManager) ForkToNewSession(cwd string, targetID string) (*TreeManag
 		return nil, fmt.Errorf("failed to recreate session file: %w", err)
 	}
 	newTm.file = f
+	newTm.writer = bufio.NewWriter(f)

 	if err := newTm.writeEntry(&newTm.header); err != nil {
 		_ = f.Close()
@@ -289,6 +300,12 @@ func (tm *TreeManager) ForkToNewSession(cwd string, targetID string) (*TreeManag
 		}
 	}

+	// Flush all buffered writes from the fork in a single syscall.
+	if err := newTm.flushLocked(); err != nil {
+		_ = f.Close()
+		return nil, fmt.Errorf("failed to flush forked session: %w", err)
+	}
+
 	// Set the leaf to the last entry in the new session.
 	newTm.leafID = prevNewID

@@ -374,6 +391,7 @@ func OpenTreeSession(path string) (*TreeManager, error) {
 		return nil, fmt.Errorf("failed to open session file for append: %w", err)
 	}
 	tm.file = f
+	tm.writer = bufio.NewWriter(f)

 	return tm, nil
 }
@@ -427,6 +445,9 @@ func (tm *TreeManager) AppendMessage(msg message.Message) (string, error) {
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush message: %w", err)
+	}

 	tm.leafID = entry.ID
 	return entry.ID, nil
@@ -451,6 +472,9 @@ func (tm *TreeManager) AppendModelChange(provider, modelID string) (string, erro
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush model change: %w", err)
+	}

 	tm.leafID = entry.ID
 	return entry.ID, nil
@@ -465,6 +489,9 @@ func (tm *TreeManager) AppendBranchSummary(fromID, summary string) (string, erro
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush branch summary: %w", err)
+	}

 	tm.leafID = entry.ID
 	return entry.ID, nil
@@ -479,6 +506,9 @@ func (tm *TreeManager) AppendLabel(targetID, label string) (string, error) {
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush label: %w", err)
+	}

 	tm.labels[targetID] = label
 	tm.leafID = entry.ID
@@ -494,6 +524,9 @@ func (tm *TreeManager) AppendSessionInfo(name string) (string, error) {
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush session info: %w", err)
+	}

 	tm.sessionName = name
 	tm.leafID = entry.ID
@@ -510,6 +543,9 @@ func (tm *TreeManager) AppendExtensionData(extType, data string) (string, error)
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush extension data: %w", err)
+	}

 	tm.leafID = entry.ID
 	return entry.ID, nil
@@ -541,6 +577,9 @@ func (tm *TreeManager) AppendCompaction(summary, firstKeptEntryID string, tokens
 	if err := tm.appendAndPersist(entry); err != nil {
 		return "", err
 	}
+	if err := tm.flushLocked(); err != nil {
+		return "", fmt.Errorf("failed to flush compaction: %w", err)
+	}

 	tm.leafID = entry.ID
 	return entry.ID, nil
@@ -926,11 +965,31 @@ func (tm *TreeManager) IsEmpty() bool {
 	return tm.MessageCount() == 0
 }

-// Close closes the underlying file handle.
+// Flush writes any buffered data to the underlying file.
+func (tm *TreeManager) Flush() error {
+	tm.mu.Lock()
+	defer tm.mu.Unlock()
+	return tm.flushLocked()
+}
+
+// flushLocked writes buffered data to disk. Caller must hold the lock.
+func (tm *TreeManager) flushLocked() error {
+	if tm.writer != nil {
+		return tm.writer.Flush()
+	}
+	return nil
+}
+
+// Close flushes any buffered writes and closes the underlying file handle.
 func (tm *TreeManager) Close() error {
 	tm.mu.Lock()
 	defer tm.mu.Unlock()
 	if tm.file != nil {
+		// Flush buffered data before closing.
+		if tm.writer != nil {
+			_ = tm.writer.Flush()
+			tm.writer = nil
+		}
 		err := tm.file.Close()
 		tm.file = nil
 		return err
@@ -1090,13 +1149,22 @@ func (tm *TreeManager) GetLastCompaction() *CompactionEntry {

 // AddLLMMessages appends multiple LLM messages as entries. This is
 // used when syncing from the agent's ConversationMessages after a step.
+// All entries are buffered and flushed to disk in a single batch.
 func (tm *TreeManager) AddLLMMessages(msgs []fantasy.Message) error {
+	tm.mu.Lock()
+	defer tm.mu.Unlock()
+
 	for _, msg := range msgs {
-		if _, err := tm.AppendLLMMessage(msg); err != nil {
+		entry, err := NewMessageEntry(tm.leafID, message.FromLLMMessage(msg))
+		if err != nil {
 			return err
 		}
+		if err := tm.appendAndPersist(entry); err != nil {
+			return err
+		}
+		tm.leafID = entry.ID
 	}
-	return nil
+	return tm.flushLocked()
 }

 // Deprecated: Use AddLLMMessages instead.
@@ -1148,12 +1216,20 @@ func (tm *TreeManager) appendAndPersist(entry any) error {
 	return nil
 }

-// writeEntry serializes an entry and appends it as a line to the file.
+// writeEntry serializes an entry and appends it to the buffered writer.
+// The data is not flushed to disk until flushLocked is called.
 func (tm *TreeManager) writeEntry(entry any) error {
 	data, err := json.Marshal(entry)
 	if err != nil {
 		return fmt.Errorf("failed to marshal entry: %w", err)
 	}
+	if tm.writer != nil {
+		if _, err := tm.writer.Write(data); err != nil {
+			return err
+		}
+		return tm.writer.WriteByte('\n')
+	}
+	// Fallback for direct file writes (shouldn't happen in normal flow).
 	data = append(data, '\n')
 	_, err = tm.file.Write(data)
 	return err
@@ -19,7 +19,7 @@ import (

 // newTestInput creates an InputComponent with the given AppController (may be nil).
 func newTestInput(ctrl AppController) *InputComponent {
-	return NewInputComponent(80, "test input", ctrl)
+	return NewInputComponent(80, ctrl)
 }

 // sendInputMsg calls component.Update with the given message, returns the
@@ -6,6 +6,8 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"sync"
+	"time"
 )

 // FileSuggestion represents a single file, directory, or MCP resource
@@ -31,6 +33,51 @@ type FileSuggestion struct {
 // maxFileSuggestions is the maximum number of file suggestions returned.
 const maxFileSuggestions = 20

+// fileListCache caches the result of listFiles() keyed by directory to avoid
+// re-running git subprocesses on every keystroke during @file completion.
+var fileListCache struct {
+	mu       sync.Mutex
+	dir      string           // searchDir that produced the cached entries
+	cwd      string           // cwd used for the git query
+	entries  []FileSuggestion // cached file list
+	expireAt time.Time        // when the cache entry expires
+}
+
+// fileListCacheTTL controls how long a cached file list stays valid.
+// During rapid typing the list is reused; after the TTL a fresh git
+// ls-files is executed so newly created files become visible.
+const fileListCacheTTL = 3 * time.Second
+
+// getCachedFileList returns the file list for searchDir, using a short-lived
+// cache to avoid repeated subprocess calls during @file autocompletion.
+func getCachedFileList(searchDir, cwd string) []FileSuggestion {
+	fileListCache.mu.Lock()
+	defer fileListCache.mu.Unlock()
+
+	now := time.Now()
+	if fileListCache.dir == searchDir &&
+		fileListCache.cwd == cwd &&
+		now.Before(fileListCache.expireAt) {
+		// Return a copy so callers can mutate (e.g. prepend baseDir).
+		cp := make([]FileSuggestion, len(fileListCache.entries))
+		copy(cp, fileListCache.entries)
+		return cp
+	}
+
+	// Cache miss or expired — run the real (potentially expensive) lookup.
+	files := listFiles(searchDir, cwd)
+
+	fileListCache.dir = searchDir
+	fileListCache.cwd = cwd
+	fileListCache.entries = files
+	fileListCache.expireAt = now.Add(fileListCacheTTL)
+
+	// Return a copy.
+	cp := make([]FileSuggestion, len(files))
+	copy(cp, files)
+	return cp
+}
+
 // ExtractAtPrefix checks the current line for an @-file trigger at cursorCol.
 // It returns:
 //   - hasAt: true if a valid @ trigger was found
@@ -99,7 +146,7 @@ func GetFileSuggestions(prefix string, cwd string) []FileSuggestion {
 		}
 	}

-	files := listFiles(searchDir, cwd)
+	files := getCachedFileList(searchDir, cwd)
 	if len(files) == 0 {
 		return nil
 	}
@@ -17,6 +17,7 @@ type Renderer interface {
 	RenderReasoningBlock(content string, timestamp time.Time) UIMessage
 	RenderToolMessage(toolName, toolArgs, toolResult string, isError bool) UIMessage
 	RenderSystemMessage(content string, timestamp time.Time) UIMessage
+	RenderCustomMessage(content, label string, timestamp time.Time) UIMessage
 	RenderErrorMessage(errorMsg string, timestamp time.Time) UIMessage
 	RenderDebugMessage(message string, timestamp time.Time) UIMessage
 	RenderDebugConfigMessage(config map[string]any, timestamp time.Time) UIMessage
@@ -40,7 +40,6 @@ type InputComponent struct {
 	width       int
 	lastValue   string
 	popupHeight int
-	title       string
 	submitNext  bool // defer submit one tick so popup dismisses cleanly

 	// Argument completion state. When the user types "/cmd " followed by
@@ -106,17 +105,17 @@ type clipboardImageMsg struct {
 	err   error
 }

-// NewInputComponent creates a new InputComponent with the given width, title,
-// and optional AppController. If appCtrl is nil the component still works but
+// NewInputComponent creates a new InputComponent with the given width and
+// optional AppController. If appCtrl is nil the component still works but
 // /clear and /clear-queue are no-ops.
-func NewInputComponent(width int, title string, appCtrl AppController) *InputComponent {
+func NewInputComponent(width int, appCtrl AppController) *InputComponent {
 	ta := textarea.New()
 	ta.Placeholder = "Type your message..."
 	ta.ShowLineNumbers = false
 	ta.Prompt = ""
 	ta.CharLimit = 0
 	ta.SetWidth(width - 8) // Account for container padding, border and internal padding
-	ta.SetHeight(3)        // Default to 3 lines like huh
+	ta.SetHeight(4)        // 4 lines for comfortable multi-line input
 	ta.Focus()

 	// Override InsertNewline so only ctrl+j and shift+enter insert newlines.
@@ -141,8 +140,8 @@ func NewInputComponent(width int, title string, appCtrl AppController) *InputCom
 		commands:    commands.SlashCommands,
 		width:       width,
 		popupHeight: 7,
-		title:       title,
 		appCtrl:     appCtrl,
+		hideHint:    true,
 	}
 }

@@ -520,19 +519,13 @@ func (s *InputComponent) resetHistoryBrowsing() {
 	s.savedInput = ""
 }

-// View implements tea.Model. Renders the title, textarea, autocomplete popup
+// View implements tea.Model. Renders the textarea, autocomplete popup
 // (if visible), and help text.
 func (s *InputComponent) View() tea.View {
 	containerStyle := lipgloss.NewStyle()

 	theme := style.GetTheme()

-	// PaddingLeft(3) aligns with message content: border(1) + paddingLeft(2).
-	titleStyle := lipgloss.NewStyle().
-		Foreground(theme.Text).
-		MarginBottom(1).
-		PaddingLeft(3)
-
 	inputBoxStyle := lipgloss.NewStyle().
 		Border(lipgloss.ThickBorder()).
 		BorderLeft(true).
@@ -540,12 +533,12 @@ func (s *InputComponent) View() tea.View {
 		BorderTop(false).
 		BorderBottom(false).
 		BorderForeground(theme.Primary).
+		MarginTop(1).
+		MarginBottom(1).
 		PaddingLeft(2).    // match message block paddingLeft
 		Width(s.width - 1) // full width minus left border

 	var view strings.Builder
-	view.WriteString(titleStyle.Render(s.title))
-	view.WriteString("\n")
 	view.WriteString(inputBoxStyle.Render(s.textarea.View()))

 	// Popup is now rendered as a centered overlay in AppModel.View()
@@ -109,8 +109,8 @@ func (m *TextMessageItem) renderContent(width int) string {
 // It accumulates content chunks and re-renders on each update for live display.
 type StreamingMessageItem struct {
 	id            string
-	role          string // "assistant" or "reasoning"
-	content       string // Accumulated streaming content
+	role          string          // "assistant" or "reasoning"
+	content       strings.Builder // Accumulated streaming content
 	timestamp     time.Time
 	startTime     time.Time // When streaming started (for live duration counter)
 	modelName     string
@@ -156,10 +156,10 @@ func (s *StreamingMessageItem) Render(width int) string {
 			durationMs = time.Since(s.startTime).Milliseconds()
 		}
 		ty := createTypography(style.GetTheme())
-		rendered = render.ReasoningBlock(s.content, durationMs, width, ty, style.GetTheme())
+		rendered = render.ReasoningBlock(s.content.String(), durationMs, width, ty, style.GetTheme())
 	} else {
 		// Render as assistant message
-		rendered = render.AssistantBlock(s.content, width, style.GetTheme())
+		rendered = render.AssistantBlock(s.content.String(), width, style.GetTheme())
 	}

 	// Cache and return (but reasoning is never cached due to live duration)
@@ -187,7 +187,7 @@ func (s *StreamingMessageItem) Height() int {

 // AppendChunk adds a content chunk and invalidates the render cache.
 func (s *StreamingMessageItem) AppendChunk(chunk string) {
-	s.content += chunk
+	s.content.WriteString(chunk)
 	s.cachedWidth = 0 // Invalidate cache
 }

@@ -243,9 +243,7 @@ func (m *StreamingBashOutputItem) Render(width int) string {

 	// Header with command
 	if m.command != "" {
-		headerStyle := lipgloss.NewStyle().
-			Foreground(theme.Muted).
-			Italic(true)
+		headerStyle := style.GetCachedStyles().BashHeader
 		parts = append(parts, headerStyle.Render(fmt.Sprintf("▸ %s", m.command)))
 	}

@@ -150,9 +150,26 @@ func (r *MessageRenderer) SetWidth(width int) {
 	r.width = width
 }

-// RenderUserMessage renders a user's input message using herald Tip alert
+// RenderUserMessage renders a user's input message with a colored left border.
 func (r *MessageRenderer) RenderUserMessage(content string, timestamp time.Time) UIMessage {
-	rendered := render.UserBlock(content, r.width, r.ty, style.GetTheme())
+	if strings.TrimSpace(content) == "" {
+		content = "(empty message)"
+	}
+
+	theme := style.GetTheme()
+
+	// Highlight @file tokens with accent color.
+	content = render.HighlightFileTokens(content, theme)
+
+	rendered := renderContentBlock(
+		content,
+		r.width,
+		WithAlign(lipgloss.Left),
+		WithBorderColor(theme.Success),
+		WithPaddingTop(0),
+		WithPaddingBottom(0),
+		WithMarginBottom(1),
+	)

 	return UIMessage{
 		Type:      UserMessage,
@@ -200,6 +217,19 @@ func (r *MessageRenderer) RenderSystemMessage(content string, timestamp time.Tim
 	}
 }

+// RenderCustomMessage renders a message with a custom alert label (e.g. "Help").
+// Content is rendered as markdown.
+func (r *MessageRenderer) RenderCustomMessage(content, label string, timestamp time.Time) UIMessage {
+	rendered := render.CustomBlock(content, label, r.width, style.GetTheme())
+
+	return UIMessage{
+		Type:      SystemMessage,
+		Content:   rendered,
+		Height:    lipgloss.Height(rendered),
+		Timestamp: timestamp,
+	}
+}
+
 // RenderDebugMessage renders diagnostic and debugging information
 func (r *MessageRenderer) RenderDebugMessage(message string, timestamp time.Time) UIMessage {
 	header := r.ty.H6("🔍 Debug Output")
@@ -308,7 +338,7 @@ func (r *MessageRenderer) RenderToolMessage(toolName, toolArgs, toolResult strin
 	// Build the content: icon + name + params on first line, then body
 	headerLine := styledIcon + " " + styledName
 	if params != "" {
-		headerLine += " " + lipgloss.NewStyle().Foreground(theme.Muted).Render(params)
+		headerLine += " " + style.GetCachedStyles().ToolMuted.Render(params)
 	}

 	// Get body content
@@ -399,7 +429,8 @@ func createTypography(theme style.Theme) *herald.Typography {
 		herald.WithCodeLineNumbers(true),
 		// Customize alert labels
 		herald.WithAlertLabel(herald.AlertNote, "Info"),
-		herald.WithAlertLabel(herald.AlertTip, "You"),
+		herald.WithAlertLabel(herald.AlertTip, ""),
+		herald.WithAlertIcon(herald.AlertTip, ""),
 		herald.WithAlertLabel(herald.AlertWarning, "Working"),
 		herald.WithAlertLabel(herald.AlertCaution, "Error"),
 	)
@@ -873,7 +873,7 @@ func NewAppModel(appCtrl AppController, opts AppModelOptions) *AppModel {
 	m.messages = []MessageItem{}

 	// Wire up child components now that we have the concrete implementations.
-	m.input = NewInputComponent(width, "Enter your prompt (Type /help for commands, Ctrl+C twice to quit)", appCtrl)
+	m.input = NewInputComponent(width, appCtrl)

 	// Wire up cwd for @file autocomplete.
 	if ic, ok := m.input.(*InputComponent); ok && opts.Cwd != "" {
@@ -1044,7 +1044,7 @@ func (m *AppModel) AddStartupMessageToScrollList() {
 	// Add a visual separator after startup info: blank line + HR + blank line.
 	// Uses a single pre-rendered item so there are no left borders on the spacing.
 	theme := style.GetTheme()
-	separator := strings.Repeat("─", 80)
+	separator := strings.Repeat("─", m.width)
 	separatorStyled := lipgloss.NewStyle().
 		Foreground(theme.Border).
 		Render(separator)
@@ -2440,8 +2440,10 @@ func (m *AppModel) View() tea.View {
 	scrollbackView := m.renderScrollback()

 	// Propagate hint visibility to the input component before rendering.
+	// Hints are hidden by default for a cleaner UI; extensions cannot
+	// override this.
 	if ic, ok := m.input.(*InputComponent); ok {
-		ic.hideHint = vis.HideInputHint
+		ic.hideHint = true
 		ic.agentBusy = m.state == stateWorking
 	}

@@ -2635,9 +2637,14 @@ func (m *AppModel) renderStatusBar() string {
 		middleSide = "  " + middleSide
 	}

-	// Right side: provider · model + usage stats.
+	// Right side: help hint + provider · model + usage stats.
+	// Order matters for progressive truncation — least important first.
 	var rightParts []string

+	rightParts = append(rightParts, lipgloss.NewStyle().
+		Foreground(theme.VeryMuted).
+		Render("/help for help"))
+
 	var modelLabel string
 	if m.providerName != "" && m.modelName != "" {
 		modelLabel = m.providerName + " · " + m.modelName
@@ -2656,11 +2663,11 @@ func (m *AppModel) renderStatusBar() string {
 		}
 	}

-	rightSide := strings.Join(rightParts, "  ")
+	rightSide := strings.Join(rightParts, "  |  ")

 	// Progressive truncation to keep the status bar on one line.
 	// When content exceeds terminal width, drop sections in order:
-	// middle (extensions/thinking) → usage stats → model label → right side.
+	// middle (extensions/thinking) → help hint → usage → model → all.
 	leftW := lipgloss.Width(leftSide)
 	middleW := lipgloss.Width(middleSide)
 	rightW := lipgloss.Width(rightSide)
@@ -2671,13 +2678,19 @@ func (m *AppModel) renderStatusBar() string {
 		middleSide = ""
 		middleW = 0
 	}
+	if leftW+rightW+1 > m.width && len(rightParts) > 2 {
+		// Drop help hint first.
+		rightParts = rightParts[1:]
+		rightSide = strings.Join(rightParts, "  |  ")
+		rightW = lipgloss.Width(rightSide)
+	}
 	if leftW+rightW+1 > m.width && len(rightParts) > 1 {
-		// Drop usage stats, keep model label.
-		rightSide = rightParts[0]
+		// Drop usage (last) next, keep model label.
+		rightParts = rightParts[:len(rightParts)-1]
+		rightSide = strings.Join(rightParts, "  |  ")
 		rightW = lipgloss.Width(rightSide)
 	}
 	if leftW+rightW+1 > m.width {
-		// Drop right side entirely.
 		rightSide = ""
 		rightW = 0
 	}
@@ -2721,7 +2734,7 @@ func (m *AppModel) cycleThinkingLevel() {
 // renderSeparator renders the separator line with an optional queue/steer count badge.
 func (m *AppModel) renderSeparator() string {
 	theme := style.GetTheme()
-	lineStyle := lipgloss.NewStyle().Foreground(theme.Muted)
+	lineStyle := lipgloss.NewStyle().Foreground(theme.Border)
 	queueLen := len(m.queuedMessages)
 	steerLen := len(m.steeringMessages)

@@ -3098,6 +3111,16 @@ func (m *AppModel) printSystemMessage(text string) {
 	m.refreshContent()
 }

+// printCustomMessage renders a message with a custom alert label into the ScrollList.
+func (m *AppModel) printCustomMessage(text, label string) {
+	styledMsg := m.renderer.RenderCustomMessage(text, label, time.Now())
+
+	msg := NewStyledMessageItem(generateMessageID(), "system", styledMsg.Content, styledMsg.Content)
+	m.messages = append(m.messages, msg)
+
+	m.refreshContent()
+}
+
 // printExtensionBlock renders a custom styled block from an extension with
 // caller-chosen border color and optional subtitle into the ScrollList.
 func (m *AppModel) printExtensionBlock(evt app.ExtensionPrintEvent) {
@@ -3481,9 +3504,10 @@ func (m *AppModel) printHelpMessage() {
 		"- `ESC` (x2): Cancel ongoing LLM generation\n" +
 		"- `Ctrl+X s`: Steer — redirect the agent mid-turn (injected between tool calls)\n" +
 		"- `Ctrl+X e`: Open `$EDITOR` to compose/edit your prompt\n" +
+		"- `Ctrl+V`: Paste image from clipboard\n" +
 		"- `Enter` (while working): Queue message for after the agent finishes\n\n" +
 		"You can also just type your message to chat with the AI assistant."
-	m.printSystemMessage(help)
+	m.printCustomMessage(help, "Help")
 }

 // printToolsMessage renders the list of available tools.
@@ -3736,15 +3760,16 @@ func (m *AppModel) distributeHeight() {
 	}

 	// Propagate hint visibility before measuring input height.
+	// Hints are always hidden for a cleaner UI.
 	if ic, ok := m.input.(*InputComponent); ok {
-		ic.hideHint = vis.HideInputHint
+		ic.hideHint = true
 	}

 	// Measure the actual rendered input (or prompt overlay) height so we
 	// don't rely on a fragile constant that drifts when styling changes.
 	// Use renderInput() which includes the editor interceptor's Render
 	// wrapper so the measured height matches what View() actually renders.
-	inputLines := 9 // fallback: title(1)+margin(1)+nl(1)+textarea(3)+nl(1)+margin(1)+help(1)
+	inputLines := 8 // fallback: marginTop(1)+textarea(4)+border-chrome(2)+marginBottom(1)
 	if m.state == statePrompt && m.prompt != nil {
 		if rendered := m.prompt.Render(); rendered != "" {
 			inputLines = lipgloss.Height(rendered)
@@ -515,12 +515,12 @@ func TestWindowResize_distributeHeight(t *testing.T) {
 	ctrl := &stubAppController{}
 	m, _, _ := newTestAppModel(ctrl)

-	// With height=30, scroll height = 30 - 1 (separator) - 9 (input) - 1 (statusBar) = 19
+	// With height=30, scroll height = 30 - 1 (separator) - 8 (input) - 1 (statusBar) = 20
 	m = sendMsg(m, tea.WindowSizeMsg{Width: 80, Height: 30})
 	_ = m

-	if m.scrollList.height != 19 {
-		t.Fatalf("expected scroll list height=19, got %d", m.scrollList.height)
+	if m.scrollList.height != 20 {
+		t.Fatalf("expected scroll list height=20, got %d", m.scrollList.height)
 	}
 }

@@ -892,7 +892,7 @@ func TestCtrlC_clearsInput_firstPress(t *testing.T) {
 	m, _, _ := newTestAppModel(ctrl)

 	// Replace with real InputComponent that has content
-	input := NewInputComponent(80, "test", ctrl)
+	input := NewInputComponent(80, ctrl)
 	input.textarea.SetValue("some text content")
 	m.input = input

@@ -937,7 +937,7 @@ func TestCtrlC_resetAfterSubmit(t *testing.T) {
 	m, _, _ := newTestAppModel(ctrl)

 	// Replace with real InputComponent
-	input := NewInputComponent(80, "test", ctrl)
+	input := NewInputComponent(80, ctrl)
 	input.textarea.SetValue("content")
 	m.input = input

@@ -986,7 +986,7 @@ func TestCtrlC_emptyInput_armsQuit(t *testing.T) {
 	m, _, _ := newTestAppModel(ctrl)

 	// Replace with real InputComponent (empty by default)
-	input := NewInputComponent(80, "test", ctrl)
+	input := NewInputComponent(80, ctrl)
 	m.input = input

 	// First Ctrl+C on empty input should arm the flag, not quit.
@@ -36,16 +36,16 @@ func UserBlock(content string, width int, ty *herald.Typography, theme style.The

 	// Highlight @file tokens with accent color so file references are
 	// visually distinct from surrounding prompt text.
-	content = highlightFileTokens(content, theme)
+	content = HighlightFileTokens(content, theme)

 	rendered := ty.Tip(content)
 	return styleMarginBottom(theme, rendered)
 }

-// highlightFileTokens wraps @file tokens in the given text with the theme
+// HighlightFileTokens wraps @file tokens in the given text with the theme
 // accent color so they stand out visually in rendered user messages.
-func highlightFileTokens(text string, theme style.Theme) string {
-	accentStyle := lipgloss.NewStyle().Foreground(theme.Accent).Bold(true)
+func HighlightFileTokens(text string, theme style.Theme) string {
+	accentStyle := style.GetCachedStyles().FileTokenAccent
 	return fileTokenPattern.ReplaceAllStringFunc(text, func(token string) string {
 		return accentStyle.Render(token)
 	})
@@ -69,15 +69,14 @@ func ReasoningBlock(content string, duration int64, width int, ty *herald.Typogr
 		return ""
 	}

-	// Match live streaming styling: muted italic text. Wrap before styling so
-	// ANSI sequences from italics don't interfere with width calculations.
+	// Match live streaming styling: muted italic text.
 	lines := strings.Split(strings.TrimRight(content, "\n"), "\n")
 	contentStr := strings.TrimLeft(strings.Join(lines, "\n"), " \t\n")
-	if width > 4 { // mirror other blocks (User/Assistant) which subtract 4
-		contentStr = lipgloss.Wrap(contentStr, width-4, "")
+	if width > 4 {
+		contentStr = wrapText(contentStr, width-4)
 	}
-	mutedStyle := lipgloss.NewStyle().Foreground(theme.Muted)
-	contentRendered := mutedStyle.Render(ty.Italic(contentStr))
+	cs := style.GetCachedStyles()
+	contentRendered := cs.Muted.Render(ty.Italic(contentStr))

 	// Build label based on duration
 	if duration > 0 {
@@ -87,14 +86,14 @@ func ReasoningBlock(content string, duration int64, width int, ty *herald.Typogr
 		} else {
 			durationStr = fmt.Sprintf("%.1fs", float64(duration)/1000)
 		}
-		labelPart := lipgloss.NewStyle().Foreground(theme.VeryMuted).Render("Thought for ")
-		durationPart := lipgloss.NewStyle().Foreground(theme.Accent).Render(durationStr)
+		labelPart := cs.VeryMuted.Render("Thought for ")
+		durationPart := cs.Accent.Render(durationStr)
 		label := labelPart + durationPart
 		rendered := contentRendered + "\n" + label
 		return styleMarginBottom(theme, rendered)
 	}

-	label := lipgloss.NewStyle().Foreground(theme.VeryMuted).Render("Thought")
+	label := cs.VeryMuted.Render("Thought")
 	rendered := contentRendered + "\n" + label

 	return styleMarginBottom(theme, rendered)
@@ -110,6 +109,45 @@ func SystemBlock(content string, ty *herald.Typography, theme style.Theme) strin
 	return styleMarginBottom(theme, rendered)
 }

+// CustomBlock renders a message with herald Note styling and a custom label.
+// Content is rendered as markdown before being wrapped in the alert. This
+// creates a one-off Typography instance with the given label so callers
+// can use any title (e.g. "Help", "Warning") without changing the shared
+// typography's default "Info" label.
+func CustomBlock(content, label string, width int, theme style.Theme) string {
+	if strings.TrimSpace(content) == "" {
+		content = "No content available"
+	}
+
+	// Render markdown first — subtract 4 for the alert bar prefix ("│ ").
+	mdWidth := max(width-4, 10)
+	rendered := style.ToMarkdown(content, mdWidth)
+
+	ty := herald.New(
+		herald.WithPalette(herald.ColorPalette{
+			Primary:   theme.Primary,
+			Secondary: theme.Secondary,
+			Tertiary:  theme.Info,
+			Accent:    theme.Accent,
+			Highlight: theme.Highlight,
+			Muted:     theme.Muted,
+			Text:      theme.Text,
+			Surface:   theme.Background,
+			Base:      theme.CodeBg,
+		}),
+		herald.WithAlertPalette(herald.AlertPalette{
+			Note:      theme.Info,
+			Tip:       theme.Success,
+			Important: theme.Accent,
+			Warning:   theme.Warning,
+			Caution:   theme.Error,
+		}),
+		herald.WithAlertLabel(herald.AlertNote, label),
+	)
+	alertRendered := ty.Note(rendered)
+	return styleMarginBottom(theme, alertRendered)
+}
+
 // ErrorBlock renders an error message with herald Caution styling.
 func ErrorBlock(errorMsg string, ty *herald.Typography, theme style.Theme) string {
 	rendered := ty.Caution(errorMsg)
@@ -156,5 +194,11 @@ func ToolBlock(displayName, params, body string, isError bool, width int, ty *he

 // styleMarginBottom applies a 1-line margin bottom using the theme.
 func styleMarginBottom(theme style.Theme, content string) string {
-	return lipgloss.NewStyle().MarginBottom(1).Render(content)
+	return style.GetCachedStyles().MarginBottom1.Render(content)
+}
+
+// wrapText soft-wraps a string to the given width using lipgloss, which is
+// ANSI-aware and preserves escape sequences across line breaks.
+func wrapText(s string, width int) string {
+	return lipgloss.NewStyle().Width(width).Render(s)
 }
@@ -23,7 +23,8 @@ func testTypography(theme style.Theme) *herald.Typography {
 			Surface:   theme.Background,
 			Base:      theme.CodeBg,
 		}),
-		herald.WithAlertLabel(herald.AlertTip, "You"),
+		herald.WithAlertLabel(herald.AlertTip, ""),
+		herald.WithAlertIcon(herald.AlertTip, ""),
 	)
 }

@@ -70,18 +71,18 @@ func TestHighlightFileTokens(t *testing.T) {

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			result := highlightFileTokens(tt.input, theme)
+			result := HighlightFileTokens(tt.input, theme)

 			for _, want := range tt.wantHas {
 				if !strings.Contains(result, want) {
-					t.Errorf("highlightFileTokens(%q) = %q, want substring %q", tt.input, result, want)
+					t.Errorf("HighlightFileTokens(%q) = %q, want substring %q", tt.input, result, want)
 				}
 			}

 			// If there were @tokens, the result should contain ANSI escape
 			// sequences (from lipgloss styling).
 			if fileTokenPattern.MatchString(tt.input) && !strings.Contains(result, "\x1b[") {
-				t.Errorf("highlightFileTokens(%q) should contain ANSI escapes for @tokens but got %q", tt.input, result)
+				t.Errorf("HighlightFileTokens(%q) should contain ANSI escapes for @tokens but got %q", tt.input, result)
 			}
 		})
 	}
@@ -21,12 +21,11 @@ func knightRiderFrames() []string {
 	const numDots = 8
 	const dot = "▪"

-	theme := style.GetTheme()
-
-	bright := lipgloss.NewStyle().Foreground(theme.Primary)
-	med := lipgloss.NewStyle().Foreground(theme.Muted)
-	dim := lipgloss.NewStyle().Foreground(theme.VeryMuted)
-	off := lipgloss.NewStyle().Foreground(theme.MutedBorder)
+	cs := style.GetCachedStyles()
+	bright := cs.SpinnerBright
+	med := cs.SpinnerMed
+	dim := cs.SpinnerDim
+	off := cs.SpinnerOff

 	// Scanner bounces: 0→7→0
 	positions := make([]int, 0, 2*numDots-2)
@@ -474,11 +473,10 @@ func (s *StreamComponent) renderReasoningBlock(reasoning string) string {
 	content := strings.TrimLeft(strings.Join(lines, "\n"), " \t\n")
 	// Soft-wrap to the available width so long lines don't get cut off.
 	if s.width > 4 {
-		content = lipgloss.Wrap(content, s.width-4, "")
+		content = lipgloss.NewStyle().Width(s.width - 4).Render(content)
 	}
-	theme := GetTheme()
-	mutedStyle := lipgloss.NewStyle().Foreground(theme.Muted)
-	parts = append(parts, mutedStyle.Render(s.ty.Italic(content)))
+	cs := style.GetCachedStyles()
+	parts = append(parts, cs.Muted.Render(s.ty.Italic(content)))

 	// Duration footer with VeryMuted label and Accent duration.
 	var duration time.Duration
@@ -494,8 +492,8 @@ func (s *StreamComponent) renderReasoningBlock(reasoning string) string {
 		} else {
 			durationStr = fmt.Sprintf("%.1fs", duration.Seconds())
 		}
-		label := lipgloss.NewStyle().Foreground(theme.VeryMuted).Render("Thought for ")
-		durationStyled := lipgloss.NewStyle().Foreground(theme.Accent).Render(durationStr)
+		label := cs.VeryMuted.Render("Thought for ")
+		durationStyled := cs.Accent.Render(durationStr)
 		parts = append(parts, label+durationStyled)
 	}

@@ -40,6 +40,70 @@ func GetTheme() Theme {
 func SetTheme(theme Theme) {
 	currentTheme = theme
 	markdownTypographyCache = nil // invalidate cached renderer; colors may have changed
+	styleCache = nil              // invalidate cached styles; colors may have changed
+}
+
+// CachedStyles holds pre-built lipgloss styles that are reused across
+// render frames. Invalidated by SetTheme, lazily rebuilt on next access.
+// Only accessed from BubbleTea's single-threaded Update/View cycle.
+type CachedStyles struct {
+	// render/blocks.go
+	FileTokenAccent lipgloss.Style // Foreground(Accent).Bold(true)
+	Muted           lipgloss.Style // Foreground(Muted)
+	VeryMuted       lipgloss.Style // Foreground(VeryMuted)
+	Accent          lipgloss.Style // Foreground(Accent)
+	MarginBottom1   lipgloss.Style // MarginBottom(1)
+
+	// stream.go - spinner phases
+	SpinnerBright lipgloss.Style // Foreground(Primary)
+	SpinnerMed    lipgloss.Style // Foreground(Muted)
+	SpinnerDim    lipgloss.Style // Foreground(VeryMuted)
+	SpinnerOff    lipgloss.Style // Foreground(MutedBorder)
+
+	// message_items.go - bash output
+	BashHeader lipgloss.Style // Foreground(Muted).Italic(true)
+	BashStderr lipgloss.Style // Foreground(Error)
+
+	// render/blocks.go - tool block
+	ToolSuccess lipgloss.Style // Foreground(Success)
+	ToolError   lipgloss.Style // Foreground(Error)
+	ToolInfo    lipgloss.Style // Foreground(Info).Bold(true)
+	ToolMuted   lipgloss.Style // Foreground(Muted)
+
+	// common
+	ErrorFg  lipgloss.Style // Foreground(Error)
+	TextBold lipgloss.Style // Foreground(Text).Bold(true)
+}
+
+var styleCache *CachedStyles
+
+// GetCachedStyles returns the pre-built style cache, creating it lazily
+// from the current theme. Invalidated by SetTheme.
+func GetCachedStyles() *CachedStyles {
+	if styleCache != nil {
+		return styleCache
+	}
+	theme := GetTheme()
+	styleCache = &CachedStyles{
+		FileTokenAccent: lipgloss.NewStyle().Foreground(theme.Accent).Bold(true),
+		Muted:           lipgloss.NewStyle().Foreground(theme.Muted),
+		VeryMuted:       lipgloss.NewStyle().Foreground(theme.VeryMuted),
+		Accent:          lipgloss.NewStyle().Foreground(theme.Accent),
+		MarginBottom1:   lipgloss.NewStyle().MarginBottom(1),
+		SpinnerBright:   lipgloss.NewStyle().Foreground(theme.Primary),
+		SpinnerMed:      lipgloss.NewStyle().Foreground(theme.Muted),
+		SpinnerDim:      lipgloss.NewStyle().Foreground(theme.VeryMuted),
+		SpinnerOff:      lipgloss.NewStyle().Foreground(theme.MutedBorder),
+		BashHeader:      lipgloss.NewStyle().Foreground(theme.Muted).Italic(true),
+		BashStderr:      lipgloss.NewStyle().Foreground(theme.Error),
+		ToolSuccess:     lipgloss.NewStyle().Foreground(theme.Success),
+		ToolError:       lipgloss.NewStyle().Foreground(theme.Error),
+		ToolInfo:        lipgloss.NewStyle().Foreground(theme.Info).Bold(true),
+		ToolMuted:       lipgloss.NewStyle().Foreground(theme.Muted),
+		ErrorFg:         lipgloss.NewStyle().Foreground(theme.Error),
+		TextBold:        lipgloss.NewStyle().Foreground(theme.Text).Bold(true),
+	}
+	return styleCache
 }

 // MarkdownThemeColors defines colors for markdown rendering and syntax highlighting.
@@ -1781,12 +1781,19 @@ func (m *Kit) Subagent(ctx context.Context, cfg SubagentConfig) (*SubagentResult

 	// Create child Kit instance. Pass the parent's loaded MCP config to
 	// avoid re-reading viper (which races with concurrent subagent spawns).
+	// Streaming must be explicitly enabled — Options.Streaming defaults to
+	// false, and New() unconditionally writes viper.Set("stream", opts.Streaming).
+	// Without this, the subagent would (a) pollute viper global state for
+	// other concurrent callers and (b) potentially hit provider-level
+	// differences (e.g. Anthropic non-streaming timeouts with extended
+	// thinking).
 	childOpts := &Options{
 		Model:        model,
 		SystemPrompt: systemPrompt,
 		Tools:        tools,
 		NoSession:    cfg.NoSession,
 		Quiet:        true,
+		Streaming:    true,
 		MCPConfig:    m.mcpConfig,
 	}
 	child, err := New(ctx, childOpts)
@@ -2,6 +2,7 @@ package kit

 import (
 	"context"
+	"strings"

 	"charm.land/fantasy"

@@ -52,6 +53,22 @@ func ErrorResult(content string) ToolOutput {
 	return ToolOutput{Content: content, IsError: true}
 }

+// ImageResult creates a [ToolOutput] that returns an image to the LLM.
+// The data is the raw image bytes and mediaType is the MIME type
+// (e.g. "image/png", "image/jpeg"). The optional text content accompanies
+// the image and is visible to the LLM alongside it.
+func ImageResult(content string, data []byte, mediaType string) ToolOutput {
+	return ToolOutput{Content: content, Data: data, MediaType: mediaType}
+}
+
+// MediaResult creates a [ToolOutput] that returns non-image binary media
+// (e.g. audio, video) to the LLM. The data is the raw bytes and mediaType
+// is the MIME type (e.g. "audio/wav", "video/mp4"). The optional text
+// content accompanies the media.
+func MediaResult(content string, data []byte, mediaType string) ToolOutput {
+	return ToolOutput{Content: content, Data: data, MediaType: mediaType}
+}
+
 // toolCallIDKey is the context key for the tool call ID.
 type toolCallIDKey struct{}

@@ -63,9 +80,35 @@ func ToolCallIDFromContext(ctx context.Context) string {
 	return s
 }

+// toolOutputToResponse converts a [ToolOutput] into the underlying
+// framework's ToolResponse, inferring the response Type from Data/MediaType
+// so that binary content (images, audio, etc.) is forwarded to the LLM
+// instead of being silently dropped.
+func toolOutputToResponse(result ToolOutput) fantasy.ToolResponse {
+	resp := fantasy.ToolResponse{
+		Content:   result.Content,
+		IsError:   result.IsError,
+		Data:      result.Data,
+		MediaType: result.MediaType,
+	}
+	// Infer response type from binary data so the downstream framework
+	// creates a media content block instead of a plain-text one.
+	if len(result.Data) > 0 && result.MediaType != "" {
+		if strings.HasPrefix(result.MediaType, "image/") {
+			resp.Type = "image"
+		} else {
+			resp.Type = "media"
+		}
+	}
+	if result.Metadata != nil {
+		resp = fantasy.WithResponseMetadata(resp, result.Metadata)
+	}
+	return resp
+}
+
 // NewTool creates a custom [Tool] with automatic JSON schema generation from
 // the TInput struct type. The handler receives a typed input (deserialized
-// from the LLM's JSON arguments) and returns a [ToolResult].
+// from the LLM's JSON arguments) and returns a [ToolOutput].
 //
 // Struct tags on TInput control the generated schema:
 //
@@ -77,6 +120,11 @@ func ToolCallIDFromContext(ctx context.Context) string {
 // The tool call ID is injected into the context and can be retrieved with
 // [ToolCallIDFromContext].
 //
+// Binary results: When [ToolOutput.Data] and [ToolOutput.MediaType] are set,
+// the response type is automatically inferred so the LLM receives the binary
+// content (e.g. an image) instead of only the text. Use [ImageResult] or
+// [MediaResult] for convenience.
+//
 // Example:
 //
 //	type WeatherInput struct {
@@ -84,7 +132,7 @@ func ToolCallIDFromContext(ctx context.Context) string {
 //	}
 //
 //	tool := kit.NewTool("get_weather", "Get weather for a city",
-//	    func(ctx context.Context, input WeatherInput) (kit.ToolResult, error) {
+//	    func(ctx context.Context, input WeatherInput) (kit.ToolOutput, error) {
 //	        return kit.TextResult("72°F, sunny in " + input.City), nil
 //	    },
 //	)
@@ -96,16 +144,7 @@ func NewTool[TInput any](name, description string, fn func(ctx context.Context,
 			if err != nil {
 				return fantasy.NewTextErrorResponse(err.Error()), nil
 			}
-			resp := fantasy.ToolResponse{
-				Content:   result.Content,
-				IsError:   result.IsError,
-				Data:      result.Data,
-				MediaType: result.MediaType,
-			}
-			if result.Metadata != nil {
-				resp = fantasy.WithResponseMetadata(resp, result.Metadata)
-			}
-			return resp, nil
+			return toolOutputToResponse(result), nil
 		},
 	)
 }
@@ -121,16 +160,7 @@ func NewParallelTool[TInput any](name, description string, fn func(ctx context.C
 			if err != nil {
 				return fantasy.NewTextErrorResponse(err.Error()), nil
 			}
-			resp := fantasy.ToolResponse{
-				Content:   result.Content,
-				IsError:   result.IsError,
-				Data:      result.Data,
-				MediaType: result.MediaType,
-			}
-			if result.Metadata != nil {
-				resp = fantasy.WithResponseMetadata(resp, result.Metadata)
-			}
-			return resp, nil
+			return toolOutputToResponse(result), nil
 		},
 	)
 }
@@ -117,3 +117,149 @@ func TestToolOutput_BinaryData(t *testing.T) {
 		t.Errorf("MediaType = %q, want %q", r.MediaType, "image/png")
 	}
 }
+
+// TestImageResult verifies the ImageResult convenience constructor.
+func TestImageResult(t *testing.T) {
+	data := []byte{0x89, 0x50, 0x4E, 0x47}
+	r := kit.ImageResult("here is the image", data, "image/png")
+	if r.Content != "here is the image" {
+		t.Errorf("Content = %q, want %q", r.Content, "here is the image")
+	}
+	if len(r.Data) != 4 {
+		t.Errorf("Data len = %d, want 4", len(r.Data))
+	}
+	if r.MediaType != "image/png" {
+		t.Errorf("MediaType = %q, want %q", r.MediaType, "image/png")
+	}
+	if r.IsError {
+		t.Error("ImageResult should not set IsError")
+	}
+}
+
+// TestMediaResult verifies the MediaResult convenience constructor.
+func TestMediaResult(t *testing.T) {
+	data := []byte{0xFF, 0xFB, 0x90, 0x00}
+	r := kit.MediaResult("audio clip", data, "audio/mpeg")
+	if r.Content != "audio clip" {
+		t.Errorf("Content = %q, want %q", r.Content, "audio clip")
+	}
+	if len(r.Data) != 4 {
+		t.Errorf("Data len = %d, want 4", len(r.Data))
+	}
+	if r.MediaType != "audio/mpeg" {
+		t.Errorf("MediaType = %q, want %q", r.MediaType, "audio/mpeg")
+	}
+	if r.IsError {
+		t.Error("MediaResult should not set IsError")
+	}
+}
+
+// TestNewTool_BinaryImageResponse verifies that NewTool correctly infers the
+// response type for image data so binary content is forwarded to the LLM
+// (issue #17).
+func TestNewTool_BinaryImageResponse(t *testing.T) {
+	type Input struct {
+		Path string `json:"path"`
+	}
+
+	imgData := []byte{0x89, 0x50, 0x4E, 0x47} // PNG magic bytes
+
+	tool := kit.NewTool("read_image", "Read an image file",
+		func(ctx context.Context, input Input) (kit.ToolOutput, error) {
+			return kit.ImageResult("Here is the image", imgData, "image/png"), nil
+		},
+	)
+
+	// Run the tool and inspect the raw ToolResponse via the AgentTool interface.
+	resp, err := tool.Run(context.Background(), kit.LLMToolCall{
+		ID:    "call_1",
+		Name:  "read_image",
+		Input: `{"path": "test.png"}`,
+	})
+	if err != nil {
+		t.Fatalf("Run() error: %v", err)
+	}
+
+	// The Type field must be "image" so the downstream framework creates a
+	// media content block instead of discarding the binary data.
+	if resp.Type != "image" {
+		t.Errorf("ToolResponse.Type = %q, want %q", resp.Type, "image")
+	}
+	if len(resp.Data) != 4 {
+		t.Errorf("ToolResponse.Data len = %d, want 4", len(resp.Data))
+	}
+	if resp.MediaType != "image/png" {
+		t.Errorf("ToolResponse.MediaType = %q, want %q", resp.MediaType, "image/png")
+	}
+	if resp.Content != "Here is the image" {
+		t.Errorf("ToolResponse.Content = %q, want %q", resp.Content, "Here is the image")
+	}
+}
+
+// TestNewTool_BinaryMediaResponse verifies type inference for non-image media.
+func TestNewTool_BinaryMediaResponse(t *testing.T) {
+	type Input struct{}
+
+	tool := kit.NewTool("get_audio", "Get audio",
+		func(ctx context.Context, input Input) (kit.ToolOutput, error) {
+			return kit.MediaResult("audio clip", []byte{0xFF, 0xFB}, "audio/mpeg"), nil
+		},
+	)
+
+	resp, err := tool.Run(context.Background(), kit.LLMToolCall{
+		ID:    "call_2",
+		Name:  "get_audio",
+		Input: `{}`,
+	})
+	if err != nil {
+		t.Fatalf("Run() error: %v", err)
+	}
+	if resp.Type != "media" {
+		t.Errorf("ToolResponse.Type = %q, want %q", resp.Type, "media")
+	}
+}
+
+// TestNewTool_TextResponseTypeNotSet verifies that text-only responses do NOT
+// get an inferred type (preserving existing behavior).
+func TestNewTool_TextResponseTypeNotSet(t *testing.T) {
+	type Input struct{}
+
+	tool := kit.NewTool("echo", "Echo",
+		func(ctx context.Context, input Input) (kit.ToolOutput, error) {
+			return kit.TextResult("hello"), nil
+		},
+	)
+
+	resp, err := tool.Run(context.Background(), kit.LLMToolCall{
+		ID: "call_3", Name: "echo", Input: `{}`,
+	})
+	if err != nil {
+		t.Fatalf("Run() error: %v", err)
+	}
+	// Text responses should not have Type set (the framework treats "" as text).
+	if resp.Type != "" {
+		t.Errorf("ToolResponse.Type = %q, want empty string for text responses", resp.Type)
+	}
+}
+
+// TestNewParallelTool_BinaryImageResponse mirrors the NewTool binary test for
+// NewParallelTool.
+func TestNewParallelTool_BinaryImageResponse(t *testing.T) {
+	type Input struct{}
+
+	tool := kit.NewParallelTool("snap", "Take a snapshot",
+		func(ctx context.Context, input Input) (kit.ToolOutput, error) {
+			return kit.ImageResult("snapshot", []byte{0xFF, 0xD8}, "image/jpeg"), nil
+		},
+	)
+
+	resp, err := tool.Run(context.Background(), kit.LLMToolCall{
+		ID: "call_4", Name: "snap", Input: `{}`,
+	})
+	if err != nil {
+		t.Fatalf("Run() error: %v", err)
+	}
+	if resp.Type != "image" {
+		t.Errorf("ToolResponse.Type = %q, want %q", resp.Type, "image")
+	}
+}
@@ -157,6 +157,18 @@ type LLMTextPart = fantasy.TextPart
 // LLMReasoningPart is a reasoning/chain-of-thought content part.
 type LLMReasoningPart = fantasy.ReasoningPart

+// LLMToolCall represents the raw tool invocation passed to a [Tool]'s Run
+// method. It carries the call ID, tool name, and the JSON-encoded input
+// arguments from the LLM. This is the execution-layer call object — distinct
+// from [ToolCall] (a message content part).
+type LLMToolCall = fantasy.ToolCall
+
+// LLMToolResponse represents the raw response returned from a [Tool]'s Run
+// method. Most SDK consumers should use [ToolOutput] with [NewTool] /
+// [NewParallelTool] instead — this alias is provided for advanced use cases
+// that need to call Tool.Run() directly (e.g. testing).
+type LLMToolResponse = fantasy.ToolResponse
+
 // LLMToolCallPart represents an LLM-initiated tool invocation within a message.
 type LLMToolCallPart = fantasy.ToolCallPart

@@ -3,10 +3,13 @@
 ACP smoke test — drives `kit acp` over JSON-RPC 2.0 stdio.

 Protocol flow:
-  1. session/new  → get sessionId
-  2. session/set_model → set opencode/kimi-k2.5
-  3. session/prompt → "What is 2+2? Answer in one sentence."
-  4. Collect session updates until done
+  1. initialize        → negotiate capabilities
+  2. session/new       → get sessionId
+  3. session/list      → verify session listing works
+  4. session/set_config_option → set model
+  5. session/prompt    → "What is 2+2? Answer in one sentence."
+  6. Collect session/update notifications until prompt response
+  7. session/cancel    → verify cancel is accepted (no-op since prompt is done)
 """

 import json
@@ -21,9 +24,24 @@ MODEL   = os.environ.get("MODEL", "opencode/kimi-k2.5")
 CWD     = os.path.expanduser("~")
 TIMEOUT = 60  # seconds to wait for the prompt to complete

+# Request ID counter — initialize=1, session/new=2, etc.
+_next_id = 0

-def rpc(method, params, req_id):
-    return json.dumps({"jsonrpc": "2.0", "id": req_id, "method": method, "params": params}) + "\n"
+
+def next_id():
+    global _next_id
+    _next_id += 1
+    return _next_id
+
+
+def rpc_request(method, params):
+    """Build a JSON-RPC 2.0 request with auto-incrementing ID."""
+    return json.dumps({"jsonrpc": "2.0", "id": next_id(), "method": method, "params": params}) + "\n"
+
+
+def rpc_notification(method, params):
+    """Build a JSON-RPC 2.0 notification (no id)."""
+    return json.dumps({"jsonrpc": "2.0", "method": method, "params": params}) + "\n"


 def send(proc, line):
@@ -32,7 +50,7 @@ def send(proc, line):
    proc.stdin.flush()


-def read_responses(proc, collected, done_event):
+def read_responses(proc, collected, done_event, prompt_id):
    """Read newline-delimited JSON from stdout until process exits."""
    for raw in proc.stdout:
        raw = raw.strip()
@@ -50,32 +68,49 @@ def read_responses(proc, collected, done_event):
        if "result" in msg:
            result = msg["result"]
            print(f"← RESP  id={msg.get('id')}  result={json.dumps(result)[:200]}", flush=True)
-            # Prompt complete when we get a stopReason on id=3
-            if msg.get("id") == 3 and "stopReason" in result:
+            # Prompt complete when we get a stopReason on the prompt request ID
+            if msg.get("id") == prompt_id and "stopReason" in result:
                done_event.set()
        elif "error" in msg:
            print(f"← ERROR id={msg.get('id')}  {json.dumps(msg['error'])}", flush=True)
            # If it's the prompt call that errored, unblock
-            if msg.get("id") == 3:
+            if msg.get("id") == prompt_id:
                done_event.set()
        elif "method" in msg:
            # Notification / session update
            m = msg.get("method", "")
            p = msg.get("params", {})
-            if m in ("session/update", "session/updated"):
+            if m == "session/update":
                update = p.get("update", {})
-                stype = update.get("sessionUpdate") or update.get("type", "?")
+                stype = update.get("sessionUpdate", "?")
                content = update.get("content", {})
+                text = content.get("text", "")
                if stype == "agent_thought_chunk":
-                    print(f"  [thinking] {content.get('text','')}", end="", flush=True)
+                    print(f"  [thinking] {text}", end="", flush=True)
                elif stype == "agent_message_chunk":
-                    print(f"  [response] {content.get('text','')}", end="", flush=True)
+                    print(f"  [response] {text}", end="", flush=True)
+                elif stype in ("tool_call", "tool_call_update"):
+                    title = update.get("title", update.get("toolCallId", "?"))
+                    status = update.get("status", "?")
+                    print(f"\n  [{stype}] {title} ({status})", flush=True)
                else:
                    print(f"\n  [update/{stype}] {json.dumps(update)[:200]}", flush=True)
            else:
                print(f"\n← NOTIF {m}  {json.dumps(p)[:200]}", flush=True)


+def wait_for_response(collected, req_id, timeout=5.0, label="response"):
+    """Block until we have a response for the given request ID."""
+    deadline = time.time() + timeout
+    while time.time() < deadline:
+        for msg in collected:
+            if msg.get("id") == req_id and ("result" in msg or "error" in msg):
+                return msg
+        time.sleep(0.1)
+    print(f"\n✗ FAIL: timed out waiting for {label} (id={req_id})", flush=True)
+    return None
+
+
 def main():
    print(f"Starting: {KIT_BIN} acp -m {MODEL}", flush=True)

@@ -91,8 +126,13 @@ def main():
    collected = []
    done_event = threading.Event()

-    reader = threading.Thread(target=read_responses, args=(proc, collected, done_event), daemon=True)
-    reader.start()
+    # We'll set the prompt_id once we know it
+    prompt_id_holder = [None]
+
+    # Start reader thread — prompt_id will be set before prompt is sent
+    class ReaderThread(threading.Thread):
+        def run(self):
+            read_responses(proc, collected, done_event, prompt_id_holder[0])

    stderr_lines = []
    def read_stderr():
@@ -105,16 +145,55 @@ def main():

    time.sleep(0.3)  # let the process initialise

-    # 1. session/new
-    send(proc, rpc("session/new", {"cwd": CWD, "mcpServers": []}, 1))
+    # ── Step 1: initialize ──────────────────────────────────────────────
+    init_id = next_id()
+    send(proc, json.dumps({
+        "jsonrpc": "2.0",
+        "id": init_id,
+        "method": "initialize",
+        "params": {
+            "protocolVersion": 1,
+            "clientCapabilities": {
+                "fs": {"readTextFile": False, "writeTextFile": False},
+            },
+            "clientInfo": {"name": "acp-smoke-test", "version": "1.0.0"},
+        },
+    }) + "\n")
+
+    # Start a simple reader for the initialize response
+    reader = threading.Thread(target=read_responses, args=(proc, collected, done_event, None), daemon=True)
+    reader.start()
+
    time.sleep(1.0)

-    session_id = None
-    for msg in collected:
-        if msg.get("id") == 1 and "result" in msg:
-            session_id = msg["result"].get("sessionId")
-            break
+    init_resp = wait_for_response(collected, init_id, timeout=5, label="initialize")
+    if not init_resp or "error" in init_resp:
+        print(f"\n✗ FAIL: initialize failed: {init_resp}", flush=True)
+        proc.terminate()
+        sys.exit(1)

+    result = init_resp["result"]
+    proto_ver = result.get("protocolVersion")
+    agent_info = result.get("agentInfo", {})
+    print(f"\n✓ Initialized: protocol_version={proto_ver} agent={agent_info.get('name', '?')} v{agent_info.get('version', '?')}", flush=True)
+
+    # ── Step 2: session/new ─────────────────────────────────────────────
+    new_session_id = next_id()
+    send(proc, json.dumps({
+        "jsonrpc": "2.0",
+        "id": new_session_id,
+        "method": "session/new",
+        "params": {"cwd": CWD, "mcpServers": []},
+    }) + "\n")
+    time.sleep(1.0)
+
+    session_resp = wait_for_response(collected, new_session_id, timeout=10, label="session/new")
+    if not session_resp or "error" in session_resp:
+        print(f"\n✗ FAIL: session/new failed: {session_resp}", flush=True)
+        proc.terminate()
+        sys.exit(1)
+
+    session_id = session_resp["result"].get("sessionId")
    if not session_id:
        print("\n✗ FAIL: did not get sessionId from session/new", flush=True)
        proc.terminate()
@@ -122,31 +201,102 @@ def main():

    print(f"\n✓ Got sessionId: {session_id}", flush=True)

-    # 2. session/set_model (model already set via -m flag, but exercise the RPC)
-    send(proc, rpc("session/set_model", {"sessionId": session_id, "modelId": MODEL}, 2))
+    # ── Step 3: session/list ────────────────────────────────────────────
+    list_id = next_id()
+    send(proc, json.dumps({
+        "jsonrpc": "2.0",
+        "id": list_id,
+        "method": "session/list",
+        "params": {},
+    }) + "\n")
    time.sleep(0.5)

-    # 3. session/prompt
+    list_resp = wait_for_response(collected, list_id, timeout=5, label="session/list")
+    if not list_resp:
+        print("\n⚠ WARN: session/list timed out (non-fatal)", flush=True)
+    elif "error" in list_resp:
+        print(f"\n⚠ WARN: session/list returned error: {list_resp['error']} (non-fatal)", flush=True)
+    else:
+        sessions = list_resp["result"].get("sessions", [])
+        print(f"\n✓ session/list returned {len(sessions)} session(s)", flush=True)
+
+    # ── Step 4: session/set_config_option (model) ───────────────────────
+    # Uses the new session/set_config_option method (replaces the old session/set_model).
+    # The model is already set via -m flag, but we exercise the RPC to verify it works.
+    config_id = next_id()
+    send(proc, json.dumps({
+        "jsonrpc": "2.0",
+        "id": config_id,
+        "method": "session/set_config_option",
+        "params": {
+            "sessionId": session_id,
+            "configId": "model",
+            "value": MODEL,
+        },
+    }) + "\n")
+    time.sleep(0.5)
+
+    config_resp = wait_for_response(collected, config_id, timeout=5, label="session/set_config_option")
+    if not config_resp:
+        print("\n⚠ WARN: session/set_config_option timed out (non-fatal)", flush=True)
+    elif "error" in config_resp:
+        print(f"\n⚠ WARN: session/set_config_option returned error: {config_resp['error']} (non-fatal)", flush=True)
+    else:
+        print(f"\n✓ session/set_config_option accepted", flush=True)
+
+    # ── Step 5: session/prompt ──────────────────────────────────────────
+    prompt_id = next_id()
+    prompt_id_holder[0] = prompt_id
+
+    # Re-wire the reader to know the prompt ID (the existing thread is already running)
+    # Since we can't change it mid-flight easily, we check the collected list instead.
+
    prompt_params = {
        "sessionId": session_id,
        "prompt": [{"type": "text", "text": "What is 2+2? Answer in one sentence."}],
    }
-    send(proc, rpc("session/prompt", prompt_params, 3))
+    send(proc, json.dumps({
+        "jsonrpc": "2.0",
+        "id": prompt_id,
+        "method": "session/prompt",
+        "params": prompt_params,
+    }) + "\n")

-    # Wait for finished update or timeout
-    if not done_event.wait(timeout=TIMEOUT):
-        print(f"\n✗ FAIL: timed out after {TIMEOUT}s waiting for finished update", flush=True)
+    # Wait for finished update or timeout — poll collected list
+    deadline = time.time() + TIMEOUT
+    prompt_resp = None
+    while time.time() < deadline:
+        for msg in collected:
+            if msg.get("id") == prompt_id and ("result" in msg or "error" in msg):
+                prompt_resp = msg
+                break
+        if prompt_resp:
+            break
+        time.sleep(0.2)
+
+    if not prompt_resp:
+        print(f"\n✗ FAIL: timed out after {TIMEOUT}s waiting for prompt response", flush=True)
        proc.terminate()
        sys.exit(1)

-    # Check we got a successful prompt response
-    prompt_resp = next((m for m in collected if m.get("id") == 3), None)
-    if prompt_resp and "error" in prompt_resp:
+    if "error" in prompt_resp:
        print(f"\n✗ FAIL: prompt returned error: {prompt_resp['error']}", flush=True)
        proc.terminate()
        sys.exit(1)

-    print("\n✓ SMOKE TEST PASSED", flush=True)
+    stop_reason = prompt_resp["result"].get("stopReason", "?")
+    print(f"\n✓ Prompt completed: stopReason={stop_reason}", flush=True)
+
+    # ── Step 6: session/cancel (no-op, prompt already done) ─────────────
+    # This is a notification (no id), so no response expected.
+    send(proc, rpc_notification("session/cancel", {"sessionId": session_id}))
+    time.sleep(0.3)
+    print("✓ session/cancel sent (no-op)", flush=True)
+
+    # ── Summary ─────────────────────────────────────────────────────────
+    # Count session updates received
+    update_count = sum(1 for m in collected if m.get("method") == "session/update")
+    print(f"\n✓ SMOKE TEST PASSED  ({update_count} session updates received)", flush=True)
    proc.terminate()
    proc.wait(timeout=5)

@@ -493,6 +493,8 @@ host, _ := kit.New(ctx, &kit.Options{
 |----------|-------------|
 | `kit.TextResult(content)` | Successful text result |
 | `kit.ErrorResult(content)` | Error result (LLM sees it as a tool error) |
+| `kit.ImageResult(content, data, mediaType)` | Image result with binary data (e.g. `"image/png"`) |
+| `kit.MediaResult(content, data, mediaType)` | Non-image media result (e.g. `"audio/mpeg"`) |

 **ToolOutput fields** (for advanced use):

@@ -1095,6 +1097,8 @@ kit.LLMUsage        // {InputTokens, OutputTokens, TotalTokens, ReasoningTokens,
                     //  CacheCreationTokens, CacheReadTokens}
 kit.LLMResponse     // {Content, FinishReason, Usage}
 kit.LLMFilePart     // {Filename, Data []byte, MediaType}
+kit.LLMToolCall     // {ID, Name, Input string} — execution-layer tool call (for Tool.Run)
+kit.LLMToolResponse // {Type, Content, Data, MediaType, IsError, ...} — raw tool response

 // Compaction types
 kit.CompactionResult, kit.CompactionOptions
@@ -101,8 +101,10 @@ Return values:
 |--------|-------------|
 | `kit.TextResult(s)` | Successful text result |
 | `kit.ErrorResult(s)` | Error result (LLM sees it as a tool error) |
+| `kit.ImageResult(s, data, mediaType)` | Image result with binary data (e.g. `"image/png"`) |
+| `kit.MediaResult(s, data, mediaType)` | Non-image media result (e.g. `"audio/mpeg"`) |

-For advanced use, return a `kit.ToolOutput` struct directly with `Data`, `MediaType`, and `Metadata` fields.
+Binary data (images, audio, etc.) in `ToolOutput.Data` is automatically forwarded to the LLM when `MediaType` is set. For advanced use, return a `kit.ToolOutput` struct directly with `Data`, `MediaType`, and `Metadata` fields.

 Use `kit.NewParallelTool` for tools that are safe to run concurrently. Use `kit.ToolCallIDFromContext(ctx)` to retrieve the LLM-assigned call ID for logging or tracing.
Author	SHA1	Message	Date
Ed Zynda	61408ed490	fix(sdk): infer ToolResponse.Type for binary data in NewTool/NewParallelTool - Infer Type="image" for image/* MIME types and Type="media" for all other binary content so the downstream framework creates a media content block instead of silently discarding Data bytes (#17) - Extract shared toolOutputToResponse() helper to eliminate duplication - Add ImageResult() and MediaResult() convenience constructors - Add LLMToolCall and LLMToolResponse type aliases so SDK consumers can call Tool.Run() without importing the underlying framework - Add 6 regression tests covering image, media, and text responses Closes #17	2026-04-22 16:58:07 +03:00
Ed Zynda	3cfb6437f9	perf(session,ui): reduce syscalls, allocations, and subprocess spam - Buffer session JSONL writes with bufio.Writer, flush at sync points; ForkToNewSession and AddLLMMessages now batch N entries into ~1 syscall - Cache lipgloss styles in style.CachedStyles, lazily built and invalidated on SetTheme; eliminates ~15 NewStyle() calls per frame in hot render paths (reasoning blocks, spinner, tool headers, margins) - Cache git ls-files results for @file suggestions with 3s TTL; typing @filename no longer spawns 3 subprocesses per keystroke - Use strings.Builder for StreamingMessageItem.content; eliminates O(n²) string copying during LLM response streaming	2026-04-22 16:48:17 +03:00
Ed Zynda	d33ad4028b	fix(kit): enable streaming for subagent child instances - Set Streaming: true in subagent childOpts to prevent viper.Set("stream", false) from polluting global state - Without this, concurrent subagents and the parent could read stale stream=false from viper, causing provider-level issues (e.g. Anthropic non-streaming timeouts with extended thinking)	2026-04-22 13:06:37 +03:00
Ed Zynda	307dcd1734	cleanup	2026-04-22 11:56:06 +03:00
Ed Zynda	81240b075e	chore: update all deps and fix acp-go-sdk v0.12.0 breaking changes - Update all Go dependencies (bubbletea v2.0.6, fantasy v0.19.0, acp-go-sdk v0.12.0, mcp-go v0.49.0, and transitive deps) - Replace SetSessionModel with SetSessionConfigOption to match new acp-go-sdk Agent interface (union type with ValueId/Boolean variants) - Add ListSessions stub returning empty list (new required method) - Refresh embedded_models.json from models.dev/api.json - Update ACP smoke test: add initialize handshake, session/list, session/set_config_option, session/cancel, and fix update parsing	2026-04-22 11:55:40 +03:00
Ed Zynda	9a662d440c	fix(ui): reduce TUI visual noise and improve layout - remove "You" label and icon from user messages, use borderless content block - remove input title bar ("Enter your prompt...") and hint line - increase textarea from 3 to 4 rows with top/bottom margin - hide input hints permanently for a cleaner UI - match separator colors (use theme.Border for both startup and input dividers) - make startup separator full terminal width instead of hardcoded 80 - add /help for help hint and pipe separators to status bar - add printCustomMessage/RenderCustomMessage for custom alert labels - render /help output as markdown with "Help" alert label - add Ctrl+V (paste image) to help message keys section - fix reasoning text wrapping using ANSI-aware lipgloss.Style.Width - export HighlightFileTokens for cross-package use	2026-04-22 11:41:09 +03:00