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docs(acp): RFC for the terminal-card rendering (implemented design)

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Records the verified design before implementing: keep dsh-bash agent-side
execution and render Zed's terminal tool-call card via the `_meta` convention
(terminal_info/terminal_output/terminal_exit), capability-gated on
clientCapabilities._meta.terminal_output, with the ```console text block as the
no-capability fallback. Rejects the spec's client-side terminal/create path (it
would bypass dsh-bash's sandbox/env-scrub/ownership/cwd). Studied
claude-agent-acp, codex-acp, and Zed's renderer to ground the wire contract.
Live streaming and command classification are noted as separate follow-ups.
This commit is contained in:
Tianyi Cui
2026-06-18 14:36:02 +08:00
parent 8acafe918f
commit 386ee14af3
4 changed files with 42 additions and 51 deletions
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packages/acp/README.md
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@@ -46,7 +46,7 @@ How a tool call renders in the editor is owned by the TOOL, not the bridge — t
The `tool/result` session event carries only `{ callId, content, isError }` — not the tool name or args — so to call a tool's `presentResult` the bridge keeps a small per-session map from `callId` to the in-flight call's `(name, args)`, populated on `tool/call` and removed as each result is presented (it holds only currently-in-flight calls, never finished ones). This is bridge-local state — NOT a change to the event schema or a core service. The map lives on the `SessionRecord`, so two concurrent sessions never cross their in-flight tool state; a `session/load` replay uses a throwaway presenter that pairs each `tool/call` with its `tool/result` as the log replays in order, so replayed tool cards render identically to live ones.
A richer rendering — the ACP **terminal** content type (a live cwd-header terminal card with streaming output) and command classification (a `cat` shown as a `read`, a `grep` as a `search`) — is a capability-gated follow-up; the ` ```console ` text block here is the guaranteed baseline for clients without the terminal capability. See [the terminal-rendering RFC](../../docs/rfc/proposed/2026-06-18-acp-terminal-and-tool-rendering.md).
A richer rendering — the ACP **terminal** content type (a live cwd-header terminal card with streaming output) and command classification (a `cat` shown as a `read`, a `grep` as a `search`) — is a capability-gated follow-up; the ` ```console ` text block here is the guaranteed baseline for clients without the terminal capability. See [the terminal-rendering RFC](../../docs/rfc/implemented/2026-06-18-acp-terminal-and-tool-rendering.md).
## Settle-exactly-once