Open the /resume session picker faster by extracting per-file metadata
across a GOMAXPROCS-sized worker pool instead of sequentially. Each
extractSessionInfo call is I/O + JSON-parse bound and independent, so
wall time drops roughly proportionally to core count — meaningful for
users with many sessions, where ListSessions + ListAllSessions ran
back-to-back on the UI goroutine before the picker rendered.
Empty sessions (no messages) are now automatically cleaned up:
1. On shutdown: When kit exits cleanly, if the current session has no
messages, the session file is deleted.
2. On /resume: When listing sessions for the resume picker, any empty
session files are deleted and not shown in the list.
This prevents accumulation of orphaned empty session files when users
start sessions but don't send any messages.
Changes:
- internal/session/tree_manager.go: add IsEmpty() helper
- internal/app/app.go: delete empty session on Close()
- internal/session/store.go: filter and delete empty sessions in listSessionsInDir()
Implement 4-phase subagent system enabling LLM and extensions to spawn,
manage, and orchestrate child Kit instances for parallel task execution.
- Phase 1: SDK API with SpawnSubagent() for extensions
- Phase 2: spawn_subagent core tool for LLM usage
- Phase 3: Session hierarchy with ParentSessionID tracking
- Phase 4: Provider pooling for concurrent model access
New files:
- internal/extensions/subagent.go: SpawnSubagent implementation
- internal/core/subagent.go: Core tool definition
- internal/models/pool.go: Provider pool for concurrency
- examples/extensions/subagent-test.go: Test extension
- openspec/subagent-support.md: Design specification
SendMessage lets extensions inject messages into the conversation and
trigger new agent turns, enabling async patterns like background
subagent execution. It delegates to app.Run() which handles queueing.
CommandDef.Execute now receives Context so commands can access
SendMessage, Print*, and session metadata. The UI layer wraps the
call via runner.GetContext() at the boundary.
Also fixes all 20+ golangci-lint issues across the codebase:
errcheck, modernize (min/max/slices.Contains/SplitSeq/range-over-int),
staticcheck (error string casing), and unused code removal.
Implement pi-style JSONL append-only session management with tree branching:
- TreeManager with id/parent_id tree structure, leaf pointer, and context
building that walks leaf-to-root for LLM messages
- Auto-discovery by cwd in ~/.kit/sessions/ with session listing
- /tree TUI overlay with ASCII art rendering, filter modes, and navigation
- /fork, /new, /name, /session slash commands for tree operations
- --continue, --resume, --no-session CLI flags
- Default auto-creates a tree session per working directory
Ed Zynda