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66 lines
2.1 KiB
Markdown
66 lines
2.1 KiB
Markdown
# ACP Notes (From Docs)
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## Core protocol model
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ACP is JSON-RPC 2.0 with bidirectional methods plus notifications.
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Client to agent baseline methods:
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- `initialize`
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- `authenticate` (optional if agent requires auth)
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- `session/new`
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- `session/prompt`
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- optional: `session/load`, `session/set_mode`, `session/set_config_option`
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- notification: `session/cancel`
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Agent to client baseline method:
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- `session/request_permission`
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Agent to client optional methods:
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- `fs/read_text_file`, `fs/write_text_file`
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- `terminal/create`, `terminal/output`, `terminal/wait_for_exit`, `terminal/kill`, `terminal/release`
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Agent to client baseline notification:
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- `session/update`
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## Required protocol behavior
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- Paths must be absolute.
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- Line numbers are 1-based.
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- Initialization must negotiate protocol version.
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- Capabilities omitted by peer must be treated as unsupported.
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## Transport state
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- ACP formally defines stdio transport today.
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- ACP docs mention streamable HTTP as draft/in progress.
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- Custom transports are allowed if JSON-RPC lifecycle semantics are preserved.
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## Session lifecycle
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- `session/new` creates session, returns `sessionId`.
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- `session/load` is optional and gated by `loadSession` capability.
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- `session/prompt` runs one turn and returns `stopReason`.
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- Streaming progress is entirely via `session/update` notifications.
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- Cancellation is `session/cancel` notification and must end with `stopReason=cancelled`.
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## Tool and HITL model
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- Tool calls are modeled through `session/update` (`tool_call`, `tool_call_update`).
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- HITL permission flow is a request/response RPC call (`session/request_permission`).
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## ACP agent process relevance for this repo
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From ACP docs agent list:
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- Claude: ACP via agent process (`zed-industries/claude-code-acp`).
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- Codex: ACP via agent process (`zed-industries/codex-acp`).
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- OpenCode: ACP agent listed natively.
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Gap to confirm for launch scope:
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- Amp is not currently listed in ACP docs as a native ACP agent or published agent process.
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- We need an explicit product decision: block Amp in v1 launch or provide/build an ACP agent process.
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