- Add sdkDefaultBaseURL map covering the 14 npm SDKs that ship a
hard-coded baseURL (groq, cerebras, mistral, xai, perplexity,
togetherai, deepinfra, cohere, v0, aihubmix, venice, merge-gateway,
openrouter, vercel gateway), so providers whose models.dev entry
omits the api field still auto-route correctly.
- Extend npmToWireProtocol so these thin OpenAI-compatible wrappers
route through fantasy's openaicompat provider.
- Add resolveTemplatedAPIURL to substitute ${VAR} placeholders for
cloudflare-workers-ai, databricks, snowflake-cortex from the env,
with friendly errors that name the missing vars.
- Wire amazon-bedrock and azure-cognitive-services aliases into the
existing native handlers; add createGoogleVertexProvider for the
google-vertex case.
- Expose kit.ResolveProviderBaseURL in the public SDK so embedders
can introspect the effective endpoint before instantiating a Kit.
- Refresh embedded_models.json from models.dev (5113 -> 5121 models;
139 providers unchanged).
* feat(ui): render half-block thumbnails for attached images (#46)
- Add internal/ui/imagepreview package: Render() draws low-res
thumbnails using Unicode half-blocks (▀) + truecolor/256-color SGR,
which survives tmux/zellij (no graphics protocol)
- Cache a rendered thumbnail per pending clipboard image in the input
component; render once at attach time, never per frame
- Fall back to the existing [N image(s) attached] text pill when the
terminal lacks truecolor/256-color support
- Document Ctrl+V paste, Ctrl+U clear, and the preview in the docs
site and README keyboard shortcuts
Fixes#46
* fix(ui): render image thumbnails off the event loop and cap size
- Render thumbnails asynchronously via a tea.Cmd instead of calling
the decode + resample path synchronously inside Update(), which
blocked the Bubble Tea event loop
- Add thumbnailReadyMsg + an imageGen generation counter so async
results land on the correct pendingImages slot and stale renders
after a clear/re-attach are discarded
- Guard imagepreview.Render against decompression bombs by checking
DecodeConfig dimensions against a max before full decode
* fix(ui): skip image preview when input width is too small
- Return 0 from thumbCols when width <= 6 so a full-size thumbnail is
no longer rendered for tiny or uninitialized (width 0) terminals;
the caller falls back to the text pill
fantasy v0.25.1+ bumps kaptinlin/jsonschema to v0.7.14+, which transitively
pulls in github.com/agentable/go-intl. Its internal/cldr/displaynames
package contains a ~143k-line / 5.4MB generated CLDR map literal that
compiles at ~6.7GB RSS, OOM-killing release builds on 7GB GitHub runners.
Pinning fantasy v0.25.0 (jsonschema v0.7.13, go-i18n v0.4.5,
messageformat-go v0.6.0) removes go-intl from the build graph entirely and
restores clean-build peak RSS from ~6.6GB back to ~1GB. Upstream issue filed
against charmbracelet/fantasy.
- Bump fantasy v0.21.0 -> v0.23.0, mcp-go v0.49.0 -> v0.51.0,
acp-go-sdk v0.12.0 -> v0.12.2, chroma v2.23.1 -> v2.24.1,
fsnotify v1.9.0 -> v1.10.1, ultraviolet, AWS SDK, Google API
- Implement CloseSession and ResumeSession on acpserver.Agent to
satisfy the expanded acp.Agent interface in acp-go-sdk v0.12.2
- Add sessionRegistry.remove helper to support session close
Fantasy v0.21.0 natively includes gpt-5.5 and other newer models in
its responsesModelIDs/responsesReasoningModelIDs lists, making our
workaround unnecessary.
- Delete responses_models.go (go:linkname hack + RegisterResponsesModels)
- Delete responses_models_test.go
- Replace isResponsesAPIModel/isResponsesReasoningModel heuristics with
direct openai.IsResponsesModel/openai.IsResponsesReasoningModel calls
- Remove RegisterResponsesModels calls from registry init/reload
- Remove hack documentation from AGENTS.md
- Update all deps (fantasy v0.21.0, smithy-go, ultraviolet, etc.)
Fantasy's hardcoded responsesModelIDs list gates whether a model uses
the Responses API or Chat Completions code path. When a new model
(e.g. gpt-5.5) is added via `kit update-models` but fantasy hasn't
been updated yet, the type mismatch between *ResponsesProviderOptions
and *ProviderOptions causes a crash.
- Add isResponsesAPIModel()/isResponsesReasoningModel() helpers that
supplement fantasy's checks with prefix-based heuristics for modern
OpenAI model families (gpt-4.1+, gpt-5+, o-series, codex, chatgpt)
- Add RegisterResponsesModels() using go:linkname to append missing
model IDs from our database into fantasy's internal slices at init
time and after ReloadGlobalRegistry()
- Replace all direct openai.IsResponsesModel/IsResponsesReasoningModel
calls in providers.go with the new helpers
- Merge embedded + cached model databases instead of cache-only fallback
- Bump fantasy v0.19.0 -> v0.20.0 to match existing import usage
- Document the technique and model-family update process in AGENTS.md
- 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
- Add ctrl+x e leader key chord to open $VISUAL/$EDITOR in a temp file
pre-populated with the current input text
- On save & quit, replace the input textarea with the edited content
- On error exit (e.g. :cq in vim), silently preserve original input
- Use charmbracelet/x/editor for editor command construction
- Use tea.ExecProcess to suspend/resume the TUI around the editor
- Update input hint text at all width breakpoints to show the shortcut
- Add ctrl+x e to /help output
Closes#5
- Replace glamour-based markdown rendering with herald/herald-md
- Update go.mod and go.sum with new dependencies
- Refactor styles.go to use Typography cache instead of TermRenderer
- Update enhanced_styles.go for compatibility
- Update btca.config.jsonc configuration
- Update github.com/indaco/herald v0.9.0 -> v0.10.0
- Update charm.land/bubbles/v2 v2.0.0 -> v2.1.0
- Update AWS SDK v2 packages
- Update google.golang.org/genai v1.51.0 -> v1.52.0
- Update various other dependencies
refactor(ui): use herald.CodeBlock for Read tool output
- Replace manual renderCodeBlock() with herald.CodeBlock()
- Add WithCodeLineNumberOffset() support for correct line numbers
- Extract language hint from file extension for syntax highlighting
- Preserve existing syntax highlighting via WithCodeFormatter()
- Remove unused codeLine struct and renderCodeBlock function
- Replace MessageRenderer with herald-based implementation
- Use herald alerts (Note, Tip, Warning, Caution) for message types
- Use blockquote for thinking/reasoning content
- Use KVGroup for startup info display
- Add margin-bottom to all message types for visual separation
- Simplify Read tool with herald CodeBlock and line numbers
- Add detectLanguage helper for syntax highlighting
- Capture extension startup messages and print after startup banner
- Remove ~200 lines of custom rendering code
- Update all Go dependencies to latest versions
- Remove internal/app/usage_test.go (import cycle)
- Add sanitizeToolCallID function to fix message tests
- All tests pass with race detection
- Upgrade charm.land/fantasy from v0.16.0 to v0.17.1
- Add buildCodexProviderOptions() to pass system prompt as 'instructions'
- The Codex API requires instructions as a top-level field, not as system message
- Set Store=false to prevent server-side conversation storage
- Use ResponsesProviderOptions.Instructions for system prompt
- Replace custom multi-select with huh.NewMultiSelect for kit install --select
- Replace raw bufio prompts in cmd/auth.go with huh.NewConfirm and huh.NewInput
- Fix extension discovery to use opinionated conventions (only scan root,
extensions/, ext/, examples/extensions/ directories, skip cmd/internal/pkg/)
- Fix loader to use same convention-based scanning for installed git repos
- Fix errcheck lint warning in loader.go
Add /model command that allows switching LLM models mid-session.
When invoked without arguments, opens a full-screen selector overlay
showing only models with configured API keys, with inline fuzzy search,
cursor navigation, and current model indicator. When invoked with an
argument (e.g. /model anthropic/claude-haiku-4-5), switches directly.
Also upgrades all Go dependencies to latest versions.
Remove the entire internal/builtin package (bash, fetch, todo, http, fs
servers) and all inprocess/builtin transport support from config and
connection pool.
Add internal/core package with 7 direct fantasy.AgentTool implementations
matching pi's coding agent: bash, read, write, edit, grep, find, ls.
These execute in-process with zero MCP/JSON serialization overhead.
Add internal/message package with crush-inspired custom content blocks:
ContentPart interface with TextContent, ReasoningContent, ToolCall,
ToolResult, and Finish types. Messages carry heterogeneous Parts slices
with type-tagged JSON serialization for persistence and a ToFantasyMessages
bridge for LLM provider integration.
Core tools are always registered on the agent. External MCP servers remain
supported for additional tools, but MCP loading failures are now non-fatal
since core tools guarantee a working baseline.
Replace catwalk dependency with direct models.dev integration (97 providers,
3039 models vs catwalk's 22/679). Auto-route @ai-sdk/openai-compatible
providers through fantasy's openaicompat using the api URL from models.dev,
eliminating the need for --provider-url. Add --all flag to 'mcphost models'
to show all providers vs just fantasy-compatible ones.
Fix all 74 golangci-lint issues: errcheck (53), staticcheck SA4006 (24),
SA9003 (2), ST1005 (5), ineffassign (3). Restructure styles.go color
handling into a colorScheme struct to eliminate SA4006 false positives
from new(x) syntax.
- Make model validation advisory: unknown models pass through to the
provider API with a stderr warning instead of blocking. Catwalk
metadata is used for cost tracking and suggestions when available.
- Add LookupModel() as the primary registry API (returns nil for
unknown models, no error).
- Add 'mcphost update-models' subcommand to refresh the model database
from a catwalk server (defaults to https://catwalk.charm.sh), a local
file, or reset to the embedded version. Supports ETag caching.
- Add disk cache layer at ~/.local/share/mcphost/providers.json;
registry loads cached data first, falls back to embedded.
- Add vercel provider support via fantasy.
- Add io.Closer plumbing to ProviderResult and Agent.Close() for
providers that hold resources.
Each spinner created a new tea.NewProgram which sent DECRQM queries for
synchronized output mode 2026. When the program exited and restored
cooked terminal mode, the terminal's DECRPM response leaked as visible
^[[?2026;2$y characters. Replace Bubble Tea spinner with a simple
goroutine animation loop writing directly to stderr via lipgloss.
Add support for using Claude models via Google Cloud Vertex AI through
the `google-vertex-anthropic` provider. This enables users who have
Claude access through their Google Cloud account to use mcphost with
Vertex AI authentication.
Changes:
- Add `google-vertex-anthropic` provider case and createVertexAnthropicProvider()
- Support multiple env var names for project/region to match eino-claude:
- Project: ANTHROPIC_VERTEX_PROJECT_ID, GOOGLE_CLOUD_PROJECT, GCLOUD_PROJECT
- Region: CLOUD_ML_REGION (defaults to "global" if not set)
- Upgrade eino from v0.5.11 to v0.7.11 (required by eino-claude v0.1.12)
- Migrate schema API from OpenAPI v3 to JSON Schema (eino v0.7.11 change)
Usage:
# Authenticate with Google Cloud
gcloud auth application-default login
# Set required environment variables
export ANTHROPIC_VERTEX_PROJECT_ID="your-project-id"
export CLOUD_ML_REGION="us-east5" # or use default "global"
# Run mcphost
mcphost --model google-vertex-anthropic:claude-sonnet-4@20250514
Reference: https://docs.anthropic.com/en/docs/claude-code/google-vertex-ai🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Ed Zynda