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Clients that negotiate the AIR `recommendedValue` capability receive concrete model and effort choices instead of ambiguous default rows. The SDK's default model is mapped only to an exact selectable model (including equivalent context suffix spellings); unavailable recommendations retain the legacy default. Recommendations remain independent of explicit selections. The adapter applies the displayed effort to the SDK at startup and on model switches, preserving supported user pins and re-reading per-model settings for automatic choices. Permission modes and clients without the capability retain their existing configuration behavior. Model and effort configuration logic is extracted into dedicated modules. Terse SDK model labels are enriched with concrete versions from model metadata: for example, `Fable` becomes `Fable 5.1`, `Sonnet` becomes `Sonnet 5`, and `Opus (1M context)` becomes `Opus 5`. Custom names are preserved, and collisions fall back to the original labels. An SDK version guard requires review on upgrades, and an opt-in live initialization test verifies the upstream model contract without sending a prompt. Validation: - `npm run check` - `npm run build` - `env -u ANTHROPIC_BASE_URL npm run test:run` — 1253 passed, 28 skipped - `RUN_INTEGRATION_TESTS=true npx vitest run src/tests/model-presentation.test.ts` — 4 passed - Regression coverage for unavailable model generations/context windows, startup effort, per-model settings, unsupported effort pins, and duplicate Opus labels
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)
- Following
- Edit review
- TODO lists
- Nested subagent transcripts
- Interactive (and background) terminals
- Custom Slash commands
- Client MCP servers
- Session-scoped long-running goals through the provider-neutral goal extension
- 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
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
Subagents are exposed only after bilateral capability negotiation. Until the released ACP SDKs
preserve the draft clientCapabilities.subagents field, a supporting client may advertise
nativeSubagentSessions in _meta.jetbrains.air.capabilities; the adapter mirrors the capability
in its initialize response. The canonical field remains supported and takes precedence once it is
available. Without either client signal, Agent/Task lifecycle keeps its legacy ordinary ACP
tool-call representation and child interactions stay on the root session. Clients that use the
historical _meta["subagent-transcript"] capability or forwardSubagentText session option retain
the flattened child transcript behavior.
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).