Files

T

retoor cc1c130b51 CAP protocol both directions: agent speak plus orchestrator drivers (1.39.0)

- Agent side: --cap-manifest plus --cap-speak stream-json binding with
  transcript-diff frames, diff/transcript artifacts, session config
- Orchestrator: PTY driver (settle heuristics on PtyProc/TuiVtScreen),
  stream-json, ACP-stdio (permission/elicit/fs/terminal serving) and
  A2A drivers (dual draft/current spelling, SSE mapping)
- Sessions, fleets: worktrees, master plans, mediated routing,
  budget refusal, audit log, research auto-answerer, --cap CLI
- cap.md contract with drift tests; research/cap-protocol archive
- Suites 1119 + 16 green

2026-10-18 13:17:35 +02:00

1.7 KiB

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ACP transports (JSON-RPC stdio)

Metadata

Field	Value
Institute	Molodetz Institute — Research & Retrieval Division
Subject	cap-protocol
Document type	Source Dossier
Tier	1
Source title	ACP Transports
Source URL	https://agentclientprotocol.com/protocol/v1/transports.md
Source type	specification
Source date (published)	Unknown, not stated (living docs)
Date researched	2026-10-18
Researched by	tai (agent), model: Muse Spark, on behalf of retoor
Research method	direct page fetch, read in full (57 lines)
Confidence	High
Status	Active

Summary

ACP stdio: client launches agent subprocess, NDJSON JSON-RPC both ways (no embedded newlines), UTF-8, agent logs on stderr only, stdout carries nothing but ACP messages, teardown is close-stdin plus terminate.

Key findings

Newline-delimited JSON-RPC with no embedded newlines: tai's stdlib json + pipes implementation needs no framing layer beyond line splitting.
stderr is log-only and MAY be ignored: tai's driver can capture it for diagnostics without protocol risk.
Streamable HTTP is draft-only; custom transports MUST preserve JSON-RPC message format and lifecycle.

Pros / strengths

Minimal transport contract; a few dozen lines of stdlib implement it fully.

Cons / limitations / caveats

No heartbeat/keepalive specified; hung agents are detected only via timeouts tai must choose itself.

Relevance to tai

The exact transport contract for the Phase 5 ACP-stdio driver (and its tests: NDJSON framing, stderr tolerance, close-stdin teardown).

Changelog

Date	Change
2026-10-18	Initial dossier created.

1.7 KiB Raw Blame History