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feat: serve session/status on v1 and v2 (#1584)

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Implements the unstable [Session status
RFD](https://agentclientprotocol.com/rfds/session-status) on both
agents, and advertises `status: {}` in the v1 `sessionCapabilities` and
the v2 `capabilities.session`.

## What it answers

| Session | v1 | v2 |
| --- | --- | --- |
| Held by this connection | `open` | `open` with `state` |
| Not held, non-empty transcript stored | `saved` | `saved` |
| Not held, no transcript | `-32002` with `data.sessionId` | same |
| Subagent session | `-32002` | `-32602`, as resume, close, fork and
delete of one |

- The request starts no query, sends no update, and waits for no resume,
restart or close.
- On v2, `state` is the foreground state as a `state_update` snapshot
holds it: with the session's `background` list and without a stop
reason. `V2Background.snapshot` builds it without marking the list as
reported, so a status request does not change which later
`state_update`s go out.
- `saved` or unknown is decided in the new shared
`src/session-status.ts`: a non-empty `<sessionId>.jsonl` in any project
directory. The request names no `cwd`, so a resume with another `cwd`
can still fail with `-32002`. A directory that cannot be read for
another reason than being absent fails the request and does not answer
`-32002`.

## Behaviour to review

- **A v1 session whose query ended reads `open`.** The connection still
holds it, and a `session/load` with the same params returns it as it is,
so `saved` would point the client at a resume that revives nothing. Its
prompts fail with the "session ended" error. v2 drops such a session and
answers from its transcript.
- **A session that was never prompted is unknown once it is closed.**
Claude Code writes the transcript at the first prompt, and a resume of
it fails with `-32002` too.
- **A subagent session does not advertise `status`,** so v2 refuses the
request like its other requests, and v1 does not know the id.
- **`open` is per connection.** Each connection has its own agent and
its own Claude Code processes.

## Not done

- The lookup does one `readdir` and one `stat` per project directory for
each probe of a session that is not held. Sharing the v1 session index's
cached scan is a follow-up.
- Not run against the real CLI (`npm run test:integration`).

## Other changes

- `isSessionId` and `projectsRoot` moved from
`src/v1/session-index/project-dirs.ts` to `src/paths.ts`, so the shared
module can use them.
- The 40 v2 and 2 AIR scenario golden files gain the capability in
`initialize`, and the origin/main comparison allows it, next to
`systemPrompt` and `auth.status`.
- The README lists `session/status` in the v2 surface.
This commit is contained in:
Ben Brandt
2026-11-10 19:11:39 +01:00
committed by GitHub
parent 99cc1f3245
commit 6bc2e058cb
58 changed files with 458 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
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@@ -140,7 +140,7 @@ for v2 is negotiated down to v1. With `v2`, the adapter rejects the `initialize`
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,
`session/fork`, `session/status`, additional directories, config options (the mode is one), plans, notices,
compaction, display terminals for commands, permission requests, elicitation, providers, auth, and
[subagents](#subagent-sessions). Steering is v1 only for now.

13
src/paths.ts
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@@ -5,3 +5,16 @@ import * as path from "node:path";
export function claudeConfigDir(): string {
return process.env.CLAUDE_CONFIG_DIR ?? path.join(os.homedir(), ".claude");
}
/** `<config>/projects`, normalized like the SDK does. */
export function projectsRoot(): string {
return path.join(claudeConfigDir(), "projects").normalize("NFC");
}
const SESSION_ID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
/** Whether `value` is a Claude session id (a UUID). Only such ids name a
* transcript, and only such ids are safe to use as a file name. */
export function isSessionId(value: unknown): value is string {
return typeof value === "string" && SESSION_ID_PATTERN.test(value);
}

68
src/session-status.ts Normal file
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@@ -0,0 +1,68 @@
/**
* `session/status` (the unstable "Session status" RFD) of a session that the
* connection does not hold: `saved` or unknown. Each core answers `open`
* itself for the sessions it holds.
*/
import * as fs from "node:fs/promises";
import * as path from "node:path";
import { RequestError } from "@agentclientprotocol/sdk/unstable";
import { isSessionId, projectsRoot } from "./paths.js";
/** What a core advertises as `status` in its session capabilities. */
export const SESSION_STATUS_CAPABILITY = {};
/**
* `saved` when a project directory holds a transcript file of `sessionId`
* that is not empty. Its content is not read, so a transcript without a
* conversation is `saved` too, and its resume fails with `-32002`. Fails with
* `-32002` and `data.sessionId` otherwise:
*
* - an id that is not a UUID, such as a subagent's session id;
* - an id without a transcript: one never used, a session never prompted
* (Claude Code writes the transcript at the first prompt), and a session
* whose transcripts were removed.
*
* The request names no `cwd`, so a transcript of any project counts: a
* resume with another `cwd` can still fail with `-32002`.
*
* It lists the project directories and stats the one file name in each. No
* query starts and no session is loaded. A directory or file that cannot be
* read for another reason than being absent fails the request: it does not
* make the session unknown.
*/
export async function savedSessionStatus(sessionId: string): Promise<{ status: "saved" }> {
if (!isSessionId(sessionId) || !(await hasTranscript(sessionId))) {
throw RequestError.sessionNotFound(sessionId);
}
return { status: "saved" };
}
async function hasTranscript(sessionId: string): Promise<boolean> {
const root = projectsRoot();
let projects: string[];
try {
projects = await fs.readdir(root);
} catch (error) {
// No session was ever stored.
if (isAbsent(error)) return false;
throw error;
}
const found = await Promise.all(
projects.map((project) =>
fs.stat(path.join(root, project, `${sessionId}.jsonl`)).then(
(stats) => stats.isFile() && stats.size > 0,
(error: unknown) => {
// No such transcript, or `project` is a file.
if (isAbsent(error)) return false;
throw error;
},
),
),
);
return found.includes(true);
}
function isAbsent(error: unknown): boolean {
const code = (error as { code?: unknown }).code;
return code === "ENOENT" || code === "ENOTDIR";
}

2
src/tests/acp-scenarios/__snapshots__/air/session-load-replay.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"status":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
{"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"content":{"text":"Fix the bug","type":"text"},"messageId":"00000000-0000-4000-8000-00000000c001","sessionUpdate":"user_message_chunk"}}}
{"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"content":{"text":"Check the file.","type":"text"},"messageId":"msg_r1","sessionUpdate":"agent_thought_chunk"}}}
{"kind":"sessionUpdate","payload":{"sessionId":"<session>","update":{"content":{"text":"I will edit it.","type":"text"},"messageId":"msg_r1","sessionUpdate":"agent_message_chunk"}}}

2
src/tests/acp-scenarios/__snapshots__/air/session-setup.jsonl generated
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@@ -1,3 +1,3 @@
{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
{"kind":"initialize","payload":{"_meta":{"jetbrains":{"air":{"capabilities":["sessionFailure","agentFileChangeReport","nativeSubagentSessions","asyncTasks","customInstructions","recommendedValue","diffPatch","planFile","backgroundSubagents"],"goal":{"actions":["set","clear"],"controlMethod":"_session/goal","version":1},"version":1}},"steering":{"supported":true}},"agentCapabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"logout":{},"status":{}},"loadSession":true,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"embeddedContext":true,"image":true},"providers":{},"sessionCapabilities":{"additionalDirectories":{},"close":{},"delete":{},"fork":{},"list":{},"resume":{},"status":{},"subagents":{},"systemPrompt":{"mode":{"override":{}}}}},"agentInfo":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"authMethods":[],"protocolVersion":1}}
{"kind":"newSession","payload":{"configOptions":[{"category":"mode","currentValue":"auto","description":"Session permission mode","id":"mode","name":"Mode","options":[{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Always ask before making changes","name":"Manual","value":"default"},{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Automatically accept all file edits","name":"Accept edits","value":"acceptEdits"},{"_meta":{"jetbrains":{"air":{"kind":"plan","version":1}}},"description":"Create a plan before making changes","name":"Plan","value":"plan"},{"_meta":{"jetbrains":{"air":{"kind":"auto_review","version":1}}},"description":"Claude handles permission decisions","name":"Auto","value":"auto"},{"_meta":{"jetbrains":{"air":{"kind":"full_access","version":1}}},"description":"Accepts all permissions","name":"Bypass permissions","value":"bypassPermissions"}],"type":"select"},{"category":"model","currentValue":"claude-sonnet-4-6","description":"AI model to use","id":"model","name":"Model","options":[{"description":"Fast","name":"Claude Sonnet 4.6","value":"claude-sonnet-4-6"}],"type":"select"}],"modes":{"availableModes":[{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Always ask before making changes","id":"default","name":"Manual"},{"_meta":{"jetbrains":{"air":{"kind":"standard","version":1}}},"description":"Automatically accept all file edits","id":"acceptEdits","name":"Accept edits"},{"_meta":{"jetbrains":{"air":{"kind":"plan","version":1}}},"description":"Create a plan before making changes","id":"plan","name":"Plan"},{"_meta":{"jetbrains":{"air":{"kind":"auto_review","version":1}}},"description":"Claude handles permission decisions","id":"auto","name":"Auto"},{"_meta":{"jetbrains":{"air":{"kind":"full_access","version":1}}},"description":"Accepts all permissions","id":"bypassPermissions","name":"Bypass permissions"}],"currentModeId":"auto"},"sessionId":"<session>"}}
{"kind":"sessionUpdate","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]]"},"name":"mcp"}],"sessionUpdate":"available_commands_update"}}}

2
src/tests/acp-scenarios/__snapshots__/v2/ask-user-question.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"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","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","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":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
{"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}

2
src/tests/acp-scenarios/__snapshots__/v2/async-task-ends-before-tool-id.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"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","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","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":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
{"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}

2
src/tests/acp-scenarios/__snapshots__/v2/async-task-held-until-tool-id.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"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","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","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":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
{"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}

2
src/tests/acp-scenarios/__snapshots__/v2/async-task-released-at-turn-end.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"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","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","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":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
{"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}

2
src/tests/acp-scenarios/__snapshots__/v2/bash-background.jsonl generated
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@@ -1,4 +1,4 @@
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"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","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","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":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
{"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}

2
src/tests/acp-scenarios/__snapshots__/v2/bash-error.jsonl generated
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@@ -1,4 +1,4 @@
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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/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
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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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src/tests/acp-scenarios/__snapshots__/v2/todo-write.jsonl generated
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{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"initialize","payload":{"authMethods":[],"capabilities":{"_meta":{"authStatus":{},"claudeCode":{"promptQueueing":true}},"auth":{"status":{}},"providers":{},"session":{"additionalDirectories":{},"delete":{},"fork":{},"mcp":{"http":{},"stdio":{}},"prompt":{"embeddedContext":{},"image":{}},"status":{},"systemPrompt":{"mode":{"override":{}}}}},"info":{"name":"@agentclientprotocol/claude-agent-acp","title":"Claude Agent","version":"<version>"},"protocolVersion":2}}
{"kind":"response","method":"session/new","payload":{"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","type":"command"}],"configOptions":[{"category":"mode","configId":"mode","currentValue":"auto","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":{"content":[{"text":"prompt 1","type":"text"}],"messageId":"<id-1>","sessionUpdate":"user_message"}}}
{"kind":"response","method":"session/prompt","payload":{"messageId":"<id-1>"}}

7
src/tests/acp-scenarios/compare.ts
View File

@@ -28,6 +28,9 @@
* - The `initialize` response also advertises `agentCapabilities.auth.status`,
* which origin/main did not: the agent now answers `auth/status` and sends
* `auth/status_update`.
* - The `initialize` response also advertises
* `agentCapabilities.sessionCapabilities.status`, which origin/main did
* not: the agent now serves `session/status`.
* - A SandboxNetworkAccess tool call is settled by a `tool_call_update` with
* only its final `status` once its permission request is answered. The
* callback runs nothing, so origin/main never settled the call (see
@@ -271,7 +274,9 @@ export function compareWithBaseline(baseline: Recorded[], traffic: Recorded[]):
});
const current = withoutSandboxNetworkSettlements(
traffic.map((record) =>
withoutAuthStatusCapability(withoutSessionCapability(record, "systemPrompt")),
withoutAuthStatusCapability(
withoutSessionCapability(withoutSessionCapability(record, "systemPrompt"), "status"),
),
),
);
const violations: string[] = [];

75
src/tests/v1/acp-agent.test.ts
View File

@@ -77,7 +77,7 @@ import {
type SDKControlGetUsageResponse,
} from "@anthropic-ai/claude-agent-sdk";
import { createHash, randomUUID } from "crypto";
import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
import { chmod, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import {
@@ -14953,6 +14953,79 @@ describe("session/fork", () => {
});
});
describe("session/status", () => {
it("answers open for the sessions it holds, and the others from their stored transcripts", async () => {
const configDir = await mkdtemp(path.join(os.tmpdir(), "session-status-"));
vi.stubEnv("CLAUDE_CONFIG_DIR", configDir);
try {
const agent = new ClaudeAcpAgent({ sessionUpdate: async () => {} } as unknown as AcpClient, {
log: () => {},
error: () => {},
});
const { agentCapabilities } = await agent.initialize({
protocolVersion: 1,
clientCapabilities: {},
});
expect(agentCapabilities?.sessionCapabilities?.status).toEqual({});
const status = (sessionId: string) => agent.sessionStatus({ sessionId });
const unknown = (sessionId: string) => ({ code: -32002, data: { sessionId } });
const sessionId = randomUUID();
agent.sessions[sessionId] = {} as ClaudeAcpAgent["sessions"][string];
await expect(status(sessionId)).resolves.toEqual({ status: "open" });
// A held session whose query ended stays open: a load returns it as it is.
agent.sessions[sessionId]!.queryClosed = true;
await expect(status(sessionId)).resolves.toEqual({ status: "open" });
// A subagent's session id, and a name that every object inherits.
await expect(status("agent-1")).rejects.toMatchObject(unknown("agent-1"));
await expect(status("constructor")).rejects.toMatchObject(unknown("constructor"));
// Closed, and never prompted: no projects directory exists yet.
delete agent.sessions[sessionId];
await expect(status(sessionId)).rejects.toMatchObject(unknown(sessionId));
// A transcript of any project counts, next to a project without one.
await mkdir(path.join(configDir, "projects", "-other"), { recursive: true });
const project = path.join(configDir, "projects", "-project");
// A directory of that name is no transcript.
await mkdir(path.join(project, `${sessionId}.jsonl`), { recursive: true });
await expect(status(sessionId)).rejects.toMatchObject(unknown(sessionId));
await rm(path.join(project, `${sessionId}.jsonl`), { recursive: true });
await writeFile(path.join(project, `${sessionId}.jsonl`), "{}\n");
await expect(status(sessionId)).resolves.toEqual({ status: "saved" });
// The request loaded nothing.
expect(agent.sessions[sessionId]).toBeUndefined();
} finally {
vi.unstubAllEnvs();
await rm(configDir, { recursive: true, force: true });
}
});
// Not on Windows, where `chmod` does not take the read permission away.
it.skipIf(process.platform === "win32" || process.getuid?.() === 0)(
"fails, not -32002, when a project directory cannot be read",
async () => {
const configDir = await mkdtemp(path.join(os.tmpdir(), "session-status-"));
vi.stubEnv("CLAUDE_CONFIG_DIR", configDir);
const project = path.join(configDir, "projects", "-project");
await mkdir(project, { recursive: true });
await chmod(project, 0o000);
try {
const agent = new ClaudeAcpAgent(
{ sessionUpdate: async () => {} } as unknown as AcpClient,
{ log: () => {}, error: () => {} },
);
await expect(agent.sessionStatus({ sessionId: randomUUID() })).rejects.toMatchObject({
code: "EACCES",
});
} finally {
await chmod(project, 0o700);
vi.unstubAllEnvs();
await rm(configDir, { recursive: true, force: true });
}
},
);
});
describe("session/close", () => {
function createMockAgent() {
const mockClient = {

2
src/tests/v1/session-index-units.test.ts
View File

@@ -4,9 +4,9 @@ import * as os from "node:os";
import * as path from "node:path";
import { deriveActivity, selectCost, type ActivityState } from "../../v1/session-index/activity.js";
import { LiveSessionRegistry, type LiveRecord } from "../../v1/session-index/live-registry.js";
import { isSessionId } from "../../paths.js";
import {
encodeProjectPath,
isSessionId,
pathAndAncestors,
projectDirMatches,
} from "../../v1/session-index/project-dirs.js";

187
src/tests/v2/acp-v2.test.ts
View File

@@ -394,6 +394,7 @@ describe("ACP protocol routing", () => {
fork: {},
additionalDirectories: {},
systemPrompt: { mode: { override: {} } },
status: {},
});
expect(response.capabilities?.providers).toEqual({});
// Not `_session/steering`, which v1 advertises in the top-level `_meta`.
@@ -747,6 +748,141 @@ describe("ACP v2 sessions", () => {
});
});
describe("session/status", () => {
/** Stores a transcript of `sessionId`, as Claude Code does at the first prompt. */
async function storeTranscript(sessionId: string, content = "{}\n") {
const project = path.join(tempDir, "claude", "projects", "-project");
await mkdir(project, { recursive: true });
await writeFile(path.join(project, `${sessionId}.jsonl`), content);
}
const status = (agent: v2.ClientContext, sessionId: string) =>
agent.request(v2.methods.agent.session.status, { sessionId });
const unknown = (sessionId: string) => ({ code: -32002, data: { sessionId } });
it("answers from memory and the stored transcript, and starts or sends nothing", async () => {
const client = v2Client();
await client.app.connectWith(connectRouter(), async (agent) => {
await initializeV2(agent);
const neverUsed = randomUUID();
await expect(status(agent, neverUsed)).rejects.toMatchObject(unknown(neverUsed));
// Not a UUID: no file is looked up under such a name.
await expect(status(agent, "../settings")).rejects.toMatchObject(unknown("../settings"));
const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
await client.authUpdate(1);
// The agent's post-setup work runs on a timer.
await new Promise((resolve) => setTimeout(resolve, 20));
const sent = client.sessionUpdates.length;
// The state as a `state_update` snapshot holds it, with the session's list.
expect(await status(agent, sessionId)).toEqual({
status: "open",
state: { state: "idle", background: [] },
});
await agent.request(v2.methods.agent.session.close, { sessionId });
// Claude Code writes the transcript at the first prompt: none is stored.
await expect(status(agent, sessionId)).rejects.toMatchObject(unknown(sessionId));
// An empty transcript holds no conversation to resume.
await storeTranscript(sessionId, "");
await expect(status(agent, sessionId)).rejects.toMatchObject(unknown(sessionId));
await storeTranscript(sessionId);
expect(await status(agent, sessionId)).toEqual({ status: "saved" });
expect(sdk.queryOptions).toHaveLength(1);
expect(client.sessionUpdates).toHaveLength(sent);
});
});
it("answers a session whose query ended without session/close from its transcript", async () => {
// Claude Code exits right after it started.
sdk.run = async function* () {};
const client = v2Client();
await client.app.connectWith(connectRouter(), async (agent) => {
await initializeV2(agent);
const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
await vi.waitFor(() => expect(v2Session(sessionId)).toBeUndefined());
await expect(status(agent, sessionId)).rejects.toMatchObject(unknown(sessionId));
await storeTranscript(sessionId);
expect(await status(agent, sessionId)).toEqual({ status: "saved" });
await client.authUpdate(1);
});
});
it("answers saved while a resume still starts the session, without waiting for it", async () => {
const sessionId = randomUUID();
await storeTranscript(sessionId);
let started!: () => void;
const starting = new Promise<void>((resolve) => {
started = resolve;
});
const initialization = sdk.initializationResult;
sdk.initializationResult = async () => {
await starting;
return initialization();
};
const client = v2Client();
await client.app.connectWith(connectRouter(), async (agent) => {
await initializeV2(agent);
const resumed = agent.request(v2.methods.agent.session.resume, { sessionId, cwd });
await vi.waitFor(() => expect(sdk.queryOptions).toHaveLength(1));
expect(await status(agent, sessionId)).toEqual({ status: "saved" });
started();
await resumed;
expect(await status(agent, sessionId)).toMatchObject({ status: "open" });
await client.authUpdate(1);
});
});
it("reports a session that waits for a permission as requires_action", async () => {
let answer!: (response: v2.RequestPermissionResponse) => void;
scriptTurns(async function* (options) {
await options.canUseTool!("Bash", { command: "ls" }, {
signal: new AbortController().signal,
suggestions: [],
toolUseID: "toolu_ls",
requestId: randomUUID(),
} as Parameters<NonNullable<Options["canUseTool"]>>[2]);
yield result(options);
yield idleState(options);
});
const client = v2Client({
answerPermission: (() =>
new Promise<v2.RequestPermissionResponse>((resolve) => {
answer = resolve;
})) as unknown as () => v2.RequestPermissionResponse,
});
await client.app.connectWith(connectRouter(), async (agent) => {
await initializeV2(agent);
const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
await agent.request(v2.methods.agent.session.prompt, { sessionId, prompt: text("go") });
await vi.waitFor(() => expect(client.permissionRequests).toHaveLength(1));
await vi.waitFor(() =>
expect(turnTrace(client.sessionUpdates).at(-1)).toBe("requires_action"),
);
expect(await agent.request(v2.methods.agent.session.status, { sessionId })).toEqual({
status: "open",
state: { state: "requires_action", background: [] },
});
answer({ outcome: { outcome: "selected", optionId: "allow-once" } });
await vi.waitFor(() => expect(turnTrace(client.sessionUpdates).at(-1)).toMatch(/^idle/));
await client.authUpdate(1);
});
// The status request added no state to the turn's.
expect(turnTrace(client.sessionUpdates)).toEqual([
"user_message",
"running",
"requires_action",
"running",
"idle end_turn",
]);
});
});
it("offers a resumed Fable 5.2 session's model as `fable`, as a new session lists it", async () => {
// On resume, the CLI lists the transcript's Fable row under its id, with no `fable` row.
const row = (value: string, resolvedModel: string, displayName: string) => ({
@@ -5677,6 +5813,57 @@ describe("ACP v2 requests that subagents make", () => {
]);
});
it("refuses session/status of a subagent's session, which does not advertise it", async () => {
let finish!: () => void;
const finished = new Promise<void>((resolve) => {
finish = resolve;
});
scriptTurns(async function* (options) {
yield toolUseMessage(options, "toolu_agent-1", "Agent", {
description: "Explore the project",
prompt: "Look around",
subagent_type: "Explore",
});
yield taskStarted(options, "agent-1", { prompt: "Look around" });
await finished;
yield taskNotification(options, "agent-1", {});
yield result(options);
yield idleState(options);
});
const client = v2Client();
await client.app.connectWith(connectRouter(), async (agent) => {
await initializeV2(agent);
const { sessionId } = await agent.request(v2.methods.agent.session.new, { cwd });
await agent.request(v2.methods.agent.session.prompt, { sessionId, prompt: text("hi") });
await vi.waitFor(() =>
expect(
client.sessionUpdates.some(
(notification) =>
notification.sessionId === "agent-1" &&
notification.update.sessionUpdate === "state_update",
),
).toBe(true),
);
await expect(
agent.request(v2.methods.agent.session.status, { sessionId: "agent-1" }),
).rejects.toMatchObject({
code: -32602,
message: expect.stringContaining("agent-1 is a subagent session"),
});
finish();
await vi.waitFor(() =>
expect(
client
.updates("state_update")
.some((update) => (update as { state: string }).state === "idle"),
).toBe(true),
);
await client.authUpdate(1);
});
});
it("sends a live child's configuration again after a replay's response, when the replay sent another", async () => {
scriptTurns(async function* (options) {
yield toolUseMessage(options, "toolu_agent-1", "Agent", {

18
src/v1/acp-agent.ts
View File

@@ -43,6 +43,8 @@ import {
SetSessionConfigOptionResponse,
SetSessionModeRequest,
SetSessionModeResponse,
SessionStatusRequest,
SessionStatusResponse,
CloseSessionRequest,
CloseSessionResponse,
DeleteSessionRequest,
@@ -91,6 +93,7 @@ import {
} from "./goal-extension.js";
import { checklistPlanUpdate, resetPlanUpdates, type SubagentChecklists } from "../plans.js";
import { PromptSuggestions } from "../prompt-suggestions.js";
import { savedSessionStatus, SESSION_STATUS_CAPABILITY } from "../session-status.js";
import { sanitizeTitle, SessionTitles } from "../session-titles.js";
import {
AIR_NATIVE_SUBAGENT_SESSIONS_CAPABILITY,
@@ -2020,6 +2023,7 @@ export class ClaudeAcpAgent {
fork: {},
list: {},
resume: {},
status: SESSION_STATUS_CAPABILITY,
systemPrompt: SYSTEM_PROMPT_CAPABILITY,
...(this.toolCallCapabilities.air.client ? { subagents: {} } : {}),
};
@@ -7859,6 +7863,19 @@ export class ClaudeAcpAgent {
return {};
}
/**
* `session/status`: `open` for a session that this connection holds. A held
* session whose query ended (`queryClosed`) is `open` too: a `session/load`
* with the same params returns it as it is, and its prompts fail with what
* happened. Every other session is `saved` or unknown by its stored
* transcript (see `session-status.ts`). A subagent's session is unknown,
* as for the other session requests.
*/
async sessionStatus({ sessionId }: SessionStatusRequest): Promise<SessionStatusResponse> {
if (Object.hasOwn(this.sessions, sessionId)) return { status: "open" };
return savedSessionStatus(sessionId);
}
/** Per client: see {@link sessionIndex.SessionIndexConnection.deleteSession}. */
async deleteSession(params: DeleteSessionRequest): Promise<DeleteSessionResponse> {
return this.sessionIndex.deleteSession(params);
@@ -11134,6 +11151,7 @@ export function v1AgentApp(
.onRequest(methods.agent.session.delete, (ctx) => agent.deleteSession(ctx.params))
.onRequest(methods.agent.session.resume, (ctx) => agent.resumeSession(ctx.params))
.onRequest(methods.agent.session.close, (ctx) => agent.closeSession(ctx.params))
.onRequest(methods.agent.session.status, (ctx) => agent.sessionStatus(ctx.params))
.onRequest(methods.agent.session.setMode, (ctx) => agent.setSessionMode(ctx.params))
.onRequest(methods.agent.session.setConfigOption, (ctx) =>
agent.setSessionConfigOption(ctx.params),

3
src/v1/session-index/list-subscriptions.ts
View File

@@ -49,7 +49,8 @@ import {
type LiveSessionRegistry,
type LiveSnapshot,
} from "./live-registry.js";
import { isExactProjectDir, isSessionId, projectDirMatches, projectsRoot } from "./project-dirs.js";
import { isSessionId, projectsRoot } from "../../paths.js";
import { isExactProjectDir, projectDirMatches } from "./project-dirs.js";
import { type IndexRow, type SessionIndex, type TranscriptCandidate } from "./session-index.js";
import { changeSignature, sessionInfoOf } from "./session-info.js";

14
src/v1/session-index/project-dirs.ts
View File

@@ -14,24 +14,10 @@
import * as fs from "node:fs/promises";
import * as path from "node:path";
import { claudeConfigDir } from "../../paths.js";
/** The SDK cuts an encoded path at this length and appends a hash. */
const MAX_SANITIZED_LENGTH = 200;
const SESSION_ID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
/** Whether `value` is a Claude session id (a UUID). Only such ids name a
* transcript, and only such ids are safe to use as a file name. */
export function isSessionId(value: unknown): value is string {
return typeof value === "string" && SESSION_ID_PATTERN.test(value);
}
/** `<config>/projects`, normalized like the SDK does. */
export function projectsRoot(): string {
return path.join(claudeConfigDir(), "projects").normalize("NFC");
}
function sanitize(value: string): string {
return value.replace(/[^a-zA-Z0-9]/g, "-");
}

2
src/v1/session-index/service.ts
View File

@@ -36,11 +36,11 @@ import {
type ListSubscriptionDeps,
} from "./list-subscriptions.js";
import { LiveSessionRegistry } from "./live-registry.js";
import { isSessionId } from "../../paths.js";
import {
canonicalPath,
exists,
isExactProjectDir,
isSessionId,
projectDirMatches,
sameProjectPath,
} from "./project-dirs.js";

3
src/v1/session-index/session-index.ts
View File

@@ -23,18 +23,17 @@ import * as fs from "node:fs/promises";
import * as path from "node:path";
import { sanitizeTitle } from "../../session-titles.js";
import { effectiveTitle, visibleTitle } from "./archive-title.js";
import { isSessionId, projectsRoot } from "../../paths.js";
import {
canonicalPath,
encodeProjectPath,
errorCode,
exists,
isExactProjectDir,
isSessionId,
normalizePath,
pathAndAncestors,
projectDirMatches,
projectDirsOf,
projectsRoot,
sameProjectPath,
} from "./project-dirs.js";
import {

21
src/v2/agent.ts
View File

@@ -58,6 +58,7 @@ import { modelSwitchHook, SessionConfig } from "./config.js";
import { fileChangePreviewHook } from "./file-preview.js";
import { canUseTool, denyingStoppedWork } from "./permissions.js";
import { reportHooks } from "./reports.js";
import { savedSessionStatus } from "../session-status.js";
import { SessionRestarts, type SetupParams } from "./restarts.js";
import { V2Session, type SessionConnection } from "./session.js";
import {
@@ -106,6 +107,7 @@ export function v2AgentApp(
.onRequest(v2.methods.agent.session.fork, ({ params }) => agent.forkSession(params))
.onRequest(v2.methods.agent.session.list, ({ params }) => agent.listSessions(params))
.onRequest(v2.methods.agent.session.close, ({ params }) => agent.closeSession(params))
.onRequest(v2.methods.agent.session.status, ({ params }) => agent.sessionStatus(params))
.onRequest(v2.methods.agent.session.delete, ({ params }) => agent.deleteSession(params))
.onRequest(v2.methods.agent.session.setConfigOption, ({ params }) =>
agent.setConfigOption(params),
@@ -452,6 +454,25 @@ class V2Agent implements AgentHandle, SessionConnection {
: { sessions };
}
/**
* `session/status`. `open`, with its foreground state, for a session whose
* query runs here. Every other session is `saved` or unknown by its stored
* transcript (see `session-status.ts`): one that a resume is still
* starting, and one whose query ended without `session/close`, which a
* resume starts again.
*
* A subagent's session does not advertise `status`, and is refused like
* its other requests. Its parent's `subagent_update` reports its state.
*
* It waits for no resume, restart or close, and changes nothing.
*/
async sessionStatus({ sessionId }: v2.SessionStatusRequest): Promise<v2.SessionStatusResponse> {
const session = this.sessions.get(sessionId);
if (session) return { status: "open", state: session.statusState() };
if (this.ownerOfChild(sessionId)) throw restrictedChild(sessionId, "ask the status of");
return savedSessionStatus(sessionId);
}
/** Closing is idempotent: a session that is not active closes at once. */
async closeSession({ sessionId }: v2.CloseSessionRequest): Promise<v2.CloseSessionResponse> {
if (this.ownerOfChild(sessionId)) throw restrictedChild(sessionId, "close");

11
src/v2/background.ts
View File

@@ -103,6 +103,17 @@ export class V2Background {
return notification;
}
/**
* `state` as the current work state of the session `sessionId`, with its
* list when it reports one: what {@link stamp} makes of the session's
* `state_update`. Unlike `stamp`, it does not count as a state that carried
* the list, so a later change of the list is reported as before.
*/
snapshot(sessionId: string, state: WorkStateName): v2.StateUpdate {
const session = this.sessions.get(sessionId);
return session ? withBackground(currentState(state), session.items) : currentState(state);
}
/**
* Records the new list of a session, and returns the updates that report it:
*

3
src/v2/initialize.ts
View File

@@ -6,6 +6,7 @@
import type { AuthMethod } from "@agentclientprotocol/sdk/unstable";
import type * as v2 from "@agentclientprotocol/sdk/experimental/v2/unstable";
import { SYSTEM_PROMPT_CAPABILITY } from "../client-system-prompt.js";
import { SESSION_STATUS_CAPABILITY } from "../session-status.js";
/**
* The session capabilities that the v2 core serves.
@@ -17,6 +18,7 @@ import { SYSTEM_PROMPT_CAPABILITY } from "../client-system-prompt.js";
* - The prompt content and MCP transports that the v1 `initialize` lists too:
* images, embedded context, and HTTP servers. v2 has no SSE transport.
* - `systemPrompt`, in `append` and `override` mode.
* - `session/status` (unstable), with the foreground state of an open session.
*/
export const V2_SESSION_CAPABILITIES: v2.SessionCapabilities = {
prompt: { image: {}, embeddedContext: {} },
@@ -25,6 +27,7 @@ export const V2_SESSION_CAPABILITIES: v2.SessionCapabilities = {
fork: {},
additionalDirectories: {},
systemPrompt: SYSTEM_PROMPT_CAPABILITY,
status: SESSION_STATUS_CAPABILITY,
};
/** v2 names the id of a method `methodId`, requires `type`, and lists `env` as name and value pairs. */

9
src/v2/session.ts
View File

@@ -362,6 +362,15 @@ export class V2Session implements RequestTarget {
];
}
/**
* The `state` of `session/status`: the foreground state now, with the
* session's list and without a stop reason. It sends nothing and changes
* nothing.
*/
statusState(): v2.StateUpdate {
return this.background.snapshot(this.sessionId, this.foregroundState());
}
/**
* Replaces the session's MCP servers, as a resume of the active session
* asks. The same servers stay as they are, connected.