kagero

Kagero — one Agent interface over coding-agent CLIs, exposed as an MCP server and a CLI. Ten backends, seven honest tools, zero pretending: whatever a backend cannot do comes back as an explicit [unsupported_capability] error, never as a guess.

Backends

Select with KAGERO_BACKEND or kagero mcp --backend=<name>; kagero backends lists what is registered.

Related MCP server: all-agents-mcp

Install

npm install kagero-mcp
# or run without installing
npx kagero-mcp

The pi-sdk backend needs its optional peer dependency:

npm install @earendil-works/pi-coding-agent

Usage

CLI

kagero prompt "List the files in the current directory"   # one-shot
KAGERO_BACKEND=mcode kagero prompt "…"                    # pick a backend
kagero backends                                           # registered backends
kagero models                                             # active backend models
kagero sessions                                           # persistent sessions
kagero mcp --backend=mcode                                # MCP server over stdio

MCP tools

run (fresh prompt, or continue a session via session_id; blocking or run_in_background), send_message (steer / follow_up / abort), task_list, task_output, task_stop (the background-run registry), history, info.

A background run returns {task_id, status: "running"} immediately; when it finishes a task-completed logging notification announces the outcome and task_output returns the final result.

History

history returns a compact normalized view, paged from the newest end (page / page_size, entry indexes are global across pages) with a full-log pointer. Readers for pi, qwen, grok, kimi, mcode (MiniMax Code), claude, codex and dsh parse each CLI's on-disk session logs, capture thinking blocks and merge tool results into their calls.

Session compression (optional)

Set KAGERO_COMPRESS_BACKEND (and optionally KAGERO_COMPRESS_MODEL) to enable run reports and the compressed live stream: agent event streams are compressed by a cheap second agent into anchored, machine-validated digests — per-move blocks with distilled reasoning, a rolling checkpoint and a status verdict. history prepends the digest header when one exists and task_output (include_blocks) returns the compressed blocks. Compressed state persists across restarts in a crash-safe journal (~/.kagero/watch/).

Architecture

Agent interface (@kagero/core)
  ├─ CliSpecAgent (@kagero/cli-backend) — spec-driven print/ACP transports,
  │    history readers, stream-json parsers
  ├─ PiSdkAgent / PiRpcAgent (@kagero/pi-backend)
  ├─ ClaudeStreamAgent (@kagero/cli-backend) — live stream-json protocol
  └─ createKageroMcpServer (@kagero/mcp) — MCP factory over any registry

See docs/ARCHITECTURE.md for the full contract.

Security & behavior

• Strict schemas. Every tool input is enforced with z.object(...).strict(); unknown fields are rejected before they reach a backend.

• Honest statuses. Runs end completed, aborted, timed-out or with the CLI's own error — a killed run is never success.

• Fail-closed permissions. Live transports answer reverse permission requests with an explicit deny; nothing is auto-approved headlessly.

• No resource leaks. Process groups are killed through a SIGTERM → grace → SIGKILL ladder; ACP clients outlive single runs and are disposed on shutdown.

License

MIT