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chore: make get_devtools_comments wait for new comments - #3158
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@yulunz @Lightning00Blade PTAL. WDYT? |
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lgtm but this feels like another method for me (i.e. poll_devtools_comments()), and the original get_devtools_comments is supposed to return fast and still blocking.
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but we do not need the original method? timeout: 0 achieves the original behavior without the waiting. |
both are fine with me. |
The tool now waits for the next CommentThreadsChanged event when no comment is pending. The default wait is 10 s and the maximum is 30 s. Set timeout to 0 to return immediately. Tools can set yieldsToolLock. ToolHandler then releases the server tool lock before the handler runs and re-acquires it before the response is built, so other tool calls proceed during the wait. The handler re-fetches comments after each wake-up because the DevTools bridge hands out each thread only once.
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…DevTools#3162) Stacked on ChromeDevTools#3158. ## Summary The comment bridge sent a `notifications/message` (logging) notification on each comment change. MCP clients do not forward these notifications to the model, so the notification had no effect on agent behavior. After ChromeDevTools#3158, `get_devtools_comments` waits for comment events directly. This PR removes the `onNotification` plumbing from `McpServer`, `McpContext`, `McpPage`, and `DevToolsCommentBridge`. The `logging` capability itself stays; it predates the comments feature. ## Tests The two bridge tests that asserted on `onNotification` now assert through `waitForCommentEvent`: the debounce still coalesces rapid events, and `dispose()` still cancels a pending event.
## Summary Add a **Pre-submit checklist** section to `AGENTS.md`. Each item comes from a recent review finding or a landed bug fix in this repository. The checklist has five groups: - **Scope and PR description**: one change per PR, title and commit type match, description lists every behavior change and matches the diff, `npm run gen` and `npm run format` ran. - **Design**: fix in the lowest layer that owns the data, fix upstream (Puppeteer, devtools-frontend) first, one helper for repeated code, options objects instead of positional `undefined` arguments, validation in Zod schemas. - **Correctness and edge cases**: no stale state after a failed call, artifacts written before a throw, abandoned async continuations, mutex guards, file removal races, `dispose()` releases every resource, secrets never reach logs, path parameters validated even when they parse as URLs. - **Tests**: every new function has a test, no vacuous assertions, `notCalled` targets the first call after validation, exact-argument assertions, reusable stubs in `tests/mocks.ts`, bounded timeouts, no second CDP session for event waits. - **Documentation and output**: tool descriptions state when a parameter is ignored, skills stay generic, one-sentence inline comments. Sources: review comments on ChromeDevTools#2679, ChromeDevTools#2797, ChromeDevTools#2859, ChromeDevTools#2881, ChromeDevTools#2901, ChromeDevTools#3048, ChromeDevTools#3082, ChromeDevTools#3109, ChromeDevTools#3120, ChromeDevTools#3132, ChromeDevTools#3134, ChromeDevTools#3139, ChromeDevTools#3148, ChromeDevTools#3156, ChromeDevTools#3158, ChromeDevTools#3161, ChromeDevTools#3182, ChromeDevTools#3183, ChromeDevTools#3186, ChromeDevTools#3187, ChromeDevTools#3188, ChromeDevTools#3189, ChromeDevTools#3192, ChromeDevTools#3196, ChromeDevTools#3197, ChromeDevTools#3198, ChromeDevTools#3203, ChromeDevTools#3204, and fixes ChromeDevTools#3150, ChromeDevTools#3160, ChromeDevTools#3185, ChromeDevTools#3202, ChromeDevTools#3207, ChromeDevTools#3208. Existing content in `AGENTS.md` is unchanged. Closes ChromeDevTools#3222
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Summary
get_devtools_commentsnow waits for the nextCommentThreadsChangedevent when no comment is pending. This replaces thesleep 10polling loop in the agent with one tool call per wait.timeoutparameter: 0–30000 ms, default 10000.timeout: 0returns immediately (previous behavior).No open DevTools comments found.and a note with the elapsed wait time.Lock handling
ToolHandlerholds a server-wide mutex per tool call. A blocking wait under that lock would stall every other tool call.This PR adds an optional
yieldsToolLockflag on tool definitions. For such tools,ToolHandlerreleases the mutex after page lookup and before the handler runs, then re-acquires it before the response is built. Page lookup,init(), dialog checks, and response formatting stay under the lock. Onlyget_devtools_commentssets the flag. The handler re-fetches after each wake-up because the DevTools bridge hands out each thread only once.Tests
ToolHandler: another tool runs while a yielding tool waits; non-yielding tools still hold the lock; the yielding tool's response is built only after a queued tool releases the lock (FIFO); the lock is re-acquired when a yielding handler throws.DevToolsCommentBridge.waitForCommentEvent: resolves on event, timeout, and dispose; concurrent waiters; no stale events.get_devtools_comments: setsyieldsToolLock; no wait when threads exist; wait then re-fetch; keep waiting after an empty event; timeout result; elapsed time when the wait ends early;timeout: 0.Follow-up
The
debug-in-devtoolsskill (separate branch) still describessleep 10polling. It will be updated after this lands.