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Kyle Carberry
a621c3cb13
## Summary Adds a new agent-side process management HTTP API and rewrites the chat execute tool to use it instead of SSH sessions. ## What changed ### New agent/agentproc/ package - **headtail.go** — Thread-safe io.Writer with bounded memory (16KB head + 16KB tail ring buffer). Provides LLM-ready output with truncation metadata and long-line truncation at 2048 bytes. - **headtail_test.go** — 16 tests including race detector coverage for concurrent writes. - **process.go** — Manager + Process types for lifecycle management using agentexec.Execer for proper OOM/nice scores. - **api.go** — HTTP API following the agentfiles chi router pattern. 4 endpoints: start, list, output, signal. ### Agent wiring (agent/agent.go, agent/api.go) Mounts the process API at /api/v0/processes, mirroring how agentfiles is mounted. ### SDK (codersdk/workspacesdk/agentconn.go) 4 new AgentConn interface methods + 7 request/response types: - StartProcess, ListProcesses, ProcessOutput, SignalProcess ### Execute tool rewrite (coderd/chatd/chattool/execute.go) - SSH to Agent API: conn.StartProcess() + conn.ProcessOutput() polling - New parameters: workdir, run_in_background - Structured response: success, exit_code, wall_duration_ms, error, truncated, note, background_process_id - Non-interactive env vars: GIT_EDITOR=true, TERM=dumb, NO_COLOR=1, PAGER=cat, etc. - Output truncation: HeadTailBuffer caps at 32KB for LLM consumption - File-dump detection with advisory notes suggesting read_file - Default timeout: 60s to 10s - Foreground polling: 200ms intervals until exit or timeout ## Architecture State lives on the agent, surviving coderd failover and instance changes. Any coderd replica can query any agent via HTTP over tailnet.