e8eb9d340f
### Summary Addresses [IJAI-1783](https://youtrack.jetbrains.com/issue/IJAI-1783). An organization can restrict the models its JetBrains gateway serves, but a session routed through `providers/set` offered the whole Claude Code catalogue, so the picker showed models the gateway then refused. `providers/set` now lists the gateway's models before it responds, and the model picker offers only the SDK models the gateway lists. - `anthropic`: `GET {baseUrl}/v1/models?limit=1000`, paginated by `has_more`/`last_id`, with the provider headers and `anthropic-version`. - `bedrock`: `GET {baseUrl}/foundation-models` (`ListFoundationModels`, `modelSummaries[].modelId`), the listing the JetBrains gateway answers on its Bedrock route. Only `anthropic.` ids count. The cross-region prefix `global` when listed, else that of the first listed id, becomes the session's `ANTHROPIC_BEDROCK_REGION_PREFIX`, so the CLI calls the models under the prefix the gateway serves; ids of other prefixes, and SDK rows resolved to another prefix, are dropped. - Rows match by `resolvedModel` (or `value`) without dates, `-vN:M` suffixes, `[1m]` hints and provider prefixes; the narrowing runs after the `availableModels` allowlist. When the gateway does not list the model a session runs (the dropped default, or a resumed or recreated session's last model), the session switches to the first listed one with `setModel`, so the CLI does not keep running an unlisted model. - The listing runs in the provider-update queue, so `providers/set` and `providers/disable` apply in the order they arrive; logout also clears a `providers/set` that is still listing. - A 4xx answer means the gateway has no listing: `providers/set` succeeds and nothing is narrowed. Any other failed listing (network error, 5xx, unexpected body, 10 s timeout) fails `providers/set` with `internal_error`, and the previous provider stays in effect. An invalid header or a base URL with credentials fails without repeating the value. A listing that matches no SDK model leaves the session with no model to offer: there is no model config option. - `vertex`, gateways set through `authenticate`, and native routing are not listed. Setting the same gateway again reuses its listing; `providers/disable` and logout drop it. - `docs/model-configuration.md` describes the narrowing. ### Not covered Background haiku requests, subagents, and a `/model` typed into the prompt choose their own model and are not checked against the listing. ### Verification ```bash npm run check npm run build npm run test:run -- --no-file-parallelism # 2964 passed, 5 failed, 30 skipped; all 5 in session-index.test.ts, flaky on main too ``` Tests stub `fetch` (`src/tests/setup-no-network.ts` answers an empty listing by default) and cover the listing requests and pagination, the Bedrock region prefix and its env, region-aware matching, the dropped default, the failing `providers/set`, and the empty picker. The JetBrains Bedrock gateway's `/foundation-models` answers `global.anthropic.claude-{haiku,opus,sonnet}-5-5` (seen through Junie, which lists the same route); this adapter has not yet been run end to end against it. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
ACP adapter for the Claude Agent SDK
Use Claude Agent SDK from ACP-compatible clients!
This tool implements an ACP agent by using the official Claude Agent SDK, supporting:
- Context @-mentions
- Images
- Tool calls (with permission requests)
- Compact file changes through the negotiated AIR diff patch extension
- Following
- Edit review
- TODO lists
- Nested subagent transcripts
- Interactive (and background) terminals
- Custom Slash commands
- Client MCP servers
/mcpin the chat: the MCP server status as a list. The adapter runs/mcp reconnect,/mcp enable, and/mcp disablethrough the SDK control API, because Claude Code refuses them in SDK mode. A reconnect of an ACP server that needs authentication starts MCP OAuth through URL elicitation- Session-scoped long-running goals for AIR through the goal extension under
_meta.jetbrains.air.goal - Structured errors, recovery, and warnings through the opt-in session failure extension
- Concrete model and effort defaults through the opt-in recommended config value extension
- Tool permission presentation, editable choices, and durable effects through the permission extension
- One fact per field in every tool call report, as the ACP tool call contract defines
- All AIR extensions, capabilities, and
_metakeys: AIR extensions
Learn more about the Agent Client Protocol.
To try changes that have landed on main but are not released yet, install from the
preview channel — every push to main publishes one. See
docs/RELEASES.md.
npm install @agentclientprotocol/claude-agent-acp@preview
Subagent sessions
A client that declares clientCapabilities.subagents, other than JetBrains AIR, gets each Agent or
Task subagent as its own child session, following the subagents RFD:
subagent_updateon the parent announces the child before any of its traffic, with the parent'stitleanddescriptionfor it, and reports its work state:running,requires_actionwhile one of its requests is open (andrunningagain when the last one ends, unless a cancel withdrew it: the child is stopping then), andidlewhen its work ends, withend_turnorcancelledwhen the SDK gives the reason. A failure isidlewith theerrorstop reason and the SDK's error text as itserror. The child keeps its session for every delegation to it.- The prompt of the Agent or Task call that launches the child, and the message of each
SendMessage call that resumes it, is a
session_messagein the child's transcript. The tool call stays a tool call of the session that made it. session/cancelon the parent interrupts Claude Code, which stops the foreground children that the turn waits on and, currently, background children too. Each stopped child reportsidlewithcancelledfrom Claude Code's own events, and the open requests of the foreground ones are withdrawn. The adapter ends no child at a cancel itself, so a child that keeps running keeps its open requests and its open tool calls. A tool call of a stopped child that Claude Code reports no result for, such as the command it was running, ends in the child's session before the cancelled prompt resolves. When Claude Code stops a background child after that, or while no prompt runs, the tool call ends right after the child reportsidle. A child that still runs when Claude Code exits isidlewith no stop reason.- A child whose parent is not yet known when it ends is not exposed, since the RFD forbids guessing its parent.
- A replay restores each child under its live session id, from its own transcript: its prompt and
each SendMessage message are
session_messages, and its end is anidlebefore the response. A launch without Claude Code's metadata file for the child stays an ordinary tool call of the parent, and a notice, for a client that takes notices, says that subagent history is missing. - After a load or resume, with or without replay, a SendMessage that resumes an agent from before it runs that agent in its session from before. Before the agent's traffic, each of its ancestors that the client was not told about in this connection is announced, parent before child and with no work state, as the RFD requires. An agent whose launch the session's history does not record stays unexposed.
- A client cannot prompt, cancel, or otherwise change a child yet.
An ACP v2 client gets the same without declaring anything, since subagents
are part of v2's baseline. Each child also reports its work state as its own state_update, right
after the parent's copy.
JetBrains AIR keeps the earlier draft of the RFD (subagent_spawned, subagent_state_update),
which it enables with nativeSubagentSessions in _meta.jetbrains.air.capabilities. See
AIR extensions.
Without either signal, Agent and Task stay ordinary tool calls and child interactions stay on the
root session. Clients that use the historical _meta["subagent-transcript"] capability or the
forwardSubagentText session option retain the flattened child transcript.
Experimental ACP v2
Started with CLAUDE_AGENT_ACP_EXPERIMENTAL_V2=1, the adapter also serves the
draft ACP v2: a client that asks for
protocol version 2 or later in initialize gets v2, and every other client gets v1, as before.
The draft can still change, and this surface changes with it.
On v2 the adapter serves the session baseline (session/new, session/list, session/resume
with replay, session/close, session/prompt, session/cancel), session/delete,
session/fork, additional directories, config options (the mode is one), plans, notices,
compaction, display terminals for commands, permission requests, elicitation, providers, auth, and
subagents. Steering and the AIR extensions are v1 only for now.
Contribution Policy
This project does not require a Contributor License Agreement (CLA). Instead, contributions are accepted under the following terms:
By contributing to this project, you agree that your contributions will be licensed under the Apache License, Version 2.0. You affirm that you have the legal right to submit your work, that you are not including code you do not have rights to, and that you understand contributions are made without requiring a Contributor License Agreement (CLA).