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refactor: advertise sessions on the experimental ACP v2 surface (#1239)

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Step 4's last session piece for opt-in ACP v2 support (after #1237,
#1238). The v2 surface now serves the whole v2 session baseline, so its
`initialize` response advertises `capabilities.session`. Until now a
conforming v2 client wouldn't call the session methods. Nothing changes
on ACP v1, and the v2 surface stays behind
`CLAUDE_AGENT_ACP_EXPERIMENTAL_V2`.

## Change

`V2_SESSION_CAPABILITIES` is a constant, since it describes what the v2
surface serves:
- **the session baseline:** `session/new`, `list`, `resume` (with replay
since #1237), `close`, `prompt`, `cancel`, and `update`;
- **`session/delete` and `additionalDirectories`.** Not `session/fork`
yet, which v1 advertises but the v2 surface doesn't serve;
- **prompt content and MCP transports,** as the agent's v1 `initialize`
lists them: images and embedded context; stdio and HTTP servers. v2 has
no SSE transport.

The top-level `_meta` (`promptQueueing`, `authStatus`) passes through as
before. `providers` stays unadvertised.

Every v2 golden file changes on its `initialize` line only.

## Release

Titled `refactor:` like the other v2 PRs, so it triggers no release on
its own. This is the point where the v2 surface becomes usable by a
conforming client, so `feat:` would also fit if you want the next
release to be a minor one.

## Verification

The handshake test pins the advertised capabilities, the schema check
validates every recorded `initialize` response, and build, lint and all
2386 tests pass.
This commit is contained in:
Ben Brandt
2026-10-02 09:52:51 -07:00
committed by GitHub
parent 22139f73c4
commit 98b17c28c8
42 changed files with 72 additions and 48 deletions
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src/tests/acp-scenarios/__snapshots__/v2/ask-user-question.jsonl generated
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src/tests/acp-scenarios/__snapshots__/v2/async-task-ends-before-tool-id.jsonl generated
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src/tests/acp-scenarios/__snapshots__/v2/async-task-held-until-tool-id.jsonl generated
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src/tests/acp-scenarios/__snapshots__/v2/async-task-released-at-turn-end.jsonl generated
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src/tests/acp-scenarios/__snapshots__/v2/bash-background.jsonl generated
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src/tests/acp-scenarios/__snapshots__/v2/bash-foreground.jsonl generated
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src/tests/acp-scenarios/__snapshots__/v2/compaction-failed-legacy.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/exit-plan-approve.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/exit-plan-reject.jsonl generated
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@@ -1,4 +1,4 @@
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2
src/tests/acp-scenarios/__snapshots__/v2/goal.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/grep-and-glob.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/mcp-tool.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/memory-recall.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/network-permission.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/notebook-edit.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/permission-denied.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/rate-limit-and-origin.jsonl generated
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2
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2
src/tests/acp-scenarios/__snapshots__/v2/session-load-replay.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/session-setup.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/skill.jsonl generated
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2
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2
src/tests/acp-scenarios/__snapshots__/v2/subagent-late-child-update.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/subagent-native-sessions.jsonl generated
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2
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2
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2
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2
src/tests/acp-scenarios/__snapshots__/v2/task-create-update.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/task-output-and-stop.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/text-and-thinking.jsonl generated
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2
src/tests/acp-scenarios/__snapshots__/v2/todo-write.jsonl generated
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2
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2
src/tests/acp-scenarios/__snapshots__/v2/web-fetch-and-search.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"_meta":{"steering":{"supported":true}},"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"_meta":{"steering":{"supported":true}},"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"session":{"additionalDirectories":{},"delete":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"configOptions":[{"category":"mode","configId":"mode","currentValue":"default","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
{"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp"}],"sessionUpdate":"available_commands_update"}}}
{"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}

2
src/tests/acp-scenarios/__snapshots__/v2/write-existing.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"_meta":{"steering":{"supported":true}},"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"_meta":{"steering":{"supported":true}},"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"session":{"additionalDirectories":{},"delete":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"configOptions":[{"category":"mode","configId":"mode","currentValue":"default","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
{"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp"}],"sessionUpdate":"available_commands_update"}}}
{"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}

2
src/tests/acp-scenarios/__snapshots__/v2/write-new.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"_meta":{"steering":{"supported":true}},"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"_meta":{"steering":{"supported":true}},"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"session":{"additionalDirectories":{},"delete":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"configOptions":[{"category":"mode","configId":"mode","currentValue":"default","description":"Session permission mode","name":"Mode","options":[{"description":"Always ask before making changes","name":"Manual","value":"default"},{"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","configId":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"sessionId":"<session>"}}
{"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"availableCommands":[{"description":"Show the MCP servers and their status, or reconnect, enable, or disable a server","input":{"hint":"[reconnect|enable|disable [<server>|all]]","type":"text"},"name":"mcp"}],"sessionUpdate":"available_commands_update"}}}
{"kind":"notification","method":"session/update","payload":{"sessionId":"<session>","update":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}

10
src/tests/acp-v2.test.ts
View File

@@ -274,8 +274,14 @@ describe("ACP protocol routing", () => {
title: "Claude Agent",
version: packageJson.version,
});
// The whole v2 session baseline and the providers methods are not served yet.
expect(response.capabilities?.session).toBeUndefined();
// The session baseline and the session extensions that the v2 surface serves,
// without `fork`; the providers methods are not served yet.
expect(response.capabilities?.session).toEqual({
prompt: { image: {}, embeddedContext: {} },
mcp: { stdio: {}, http: {} },
delete: {},
additionalDirectories: {},
});
expect(response.capabilities?.providers).toBeUndefined();
expect(response.authMethods?.length).toBeGreaterThan(0);
for (const method of response.authMethods ?? []) {

30
src/v2/initialize.ts
View File

@@ -45,11 +45,8 @@ export function v1InitializeRequest(request: v2.InitializeRequest): InitializeRe
/**
* The v2 `initialize` response for the v1 response of the agent.
*
* It advertises no `session` capability yet. A v2 agent that advertises
* `session` must serve the whole session baseline (`session/new`, `list`,
* `resume`, `close`, `prompt`, `cancel`, and `update`), and the v2 surface of
* the adapter does not serve it yet. Nor does it advertise the unstable
* `providers` methods, which the v2 surface does not serve yet either.
* It does not advertise the unstable `providers` methods, which the v2
* surface does not serve yet.
*/
export function v2InitializeResponse(response: InitializeResponse): v2.InitializeResponse {
if (!response.agentInfo) {
@@ -61,12 +58,33 @@ export function v2InitializeResponse(response: InitializeResponse): v2.Initializ
info: response.agentInfo,
// v1 `auth.logout` has no v2 counterpart: a v2 agent that advertises auth
// methods must serve `auth/logout`.
capabilities: meta != null ? { _meta: meta } : {},
capabilities: {
session: V2_SESSION_CAPABILITIES,
...(meta != null ? { _meta: meta } : {}),
},
authMethods: (response.authMethods ?? []).map(v2AuthMethod),
...(response._meta != null ? { _meta: response._meta } : {}),
};
}
/**
* The session capabilities of the v2 surface, which serves each through a v1
* method of the agent.
*
* - The session baseline: `session/new`, `list`, `resume` (with replay),
* `close`, `prompt`, `cancel`, and `update`.
* - `session/delete` and `additionalDirectories`. Not `session/fork` yet.
* - The prompt content and MCP transports that the agent's v1 `initialize`
* lists: images, embedded context, and HTTP servers. Stdio servers are in the
* v1 baseline; v2 has no SSE transport.
*/
const V2_SESSION_CAPABILITIES: v2.SessionCapabilities = {
prompt: { image: {}, embeddedContext: {} },
mcp: { stdio: {}, http: {} },
delete: {},
additionalDirectories: {},
};
/** v2 names the id of a method `methodId`, requires `type`, and lists `env` as name and value pairs. */
function v2AuthMethod(method: AuthMethod): v2.AuthMethod {
if ("type" in method && method.type === "terminal") {