[代理镜像] fix: improve tool descriptions by madhaviai · Pull Request #965 · ChromeDevTools/chrome-devtools-mcp

madhaviai · 2026-02-14T20:03:45Z

Addresses cases where DevTools MCP tools were not consistently picked up from natural language prompts by improving tool descriptions and metadata.

Validation:
Tested locally across multiple prompts related to LCP and page performance.
MCP tools were selected more consistently after the description updates.

Refs #940

natorion

Thanks! Can you please elaborate with which prompts you tested it and for which MCP clients?

I think this should also add an eval to https://github.com/ChromeDevTools/chrome-devtools-mcp/tree/main/scripts/eval_scenarios @OrKoN ?

OrKoN · 2026-02-16T12:08:34Z

I will add an eval but I think the change is good.

Addresses cases where DevTools MCP tools were not consistently picked up from natural language prompts by improving tool descriptions and metadata. Refs ChromeDevTools#940

Refs ChromeDevTools#940

OrKoN · 2026-02-18T13:12:30Z

@madhaviai do you have answers to @natorion questions in #965 (review) ?

…0.1585538 in the bundled-devtools group (ChromeDevTools#984) Bumps the bundled-devtools group with 1 update: [chrome-devtools-frontend](https://github.com/ChromeDevTools/devtools-frontend). Updates `chrome-devtools-frontend` from 1.0.1583146 to 1.0.1585538 <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/4d8f4f79cf2b51fd2a9073586f19b21f06121e58"><code>4d8f4f7</code></a> Update DevTools DEPS (trusted)</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/84b7f207e8baf84ddceaa9bc7deaa6e5b0ee3eb1"><code>84b7f20</code></a> RPP: persist sidebar state</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/672475e703776dcd0f51a00426e92030157679f4"><code>672475e</code></a> ComputedStyles: pass model to widget as a setter</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/7d49b087962baf67d40e32f618a72250bf572639"><code>7d49b08</code></a> ComputedStylesWidget is given styles rather than fetching them.</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/748db09de193a39273f0c23c8e24dab5905f14b3"><code>748db09</code></a> Extract common var in UI helpers</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/c26d0baa5be16de198c1c7c001f8e89dd8f135da"><code>c26d0ba</code></a> Roll browser-protocol</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/3ada56c22c5ee28a4d11c9d98b4f9d65c1cd070e"><code>3ada56c</code></a> Update DevTools DEPS (trusted)</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/4a8d3db3f0d3480425ced5b8cdab5215ca575148"><code>4a8d3db</code></a> Update context selection per Greenlines</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/509282ff0dda633babe4a20e1677a7a693e85f74"><code>509282f</code></a> Update prompt for AI code gen to handle vague instructions</li> <li><a href="https://github.com/ChromeDevTools/devtools-frontend/commit/b9cf6fcc8ef261a906313b79318bf7f79e129c6b"><code>b9cf6fc</code></a> Make teaser text click-through</li> <li>Additional commits viewable in <a href="https://github.com/ChromeDevTools/devtools-frontend/compare/v1.0.1583146...v1.0.1585538">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=chrome-devtools-frontend&package-manager=npm_and_yarn&previous-version=1.0.1583146&new-version=1.0.1585538)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore <dependency name> major version` will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself) - `@dependabot ignore <dependency name> minor version` will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself) - `@dependabot ignore <dependency name>` will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself) - `@dependabot unignore <dependency name>` will remove all of the ignore conditions of the specified dependency - `@dependabot unignore <dependency name> <ignore condition>` will remove the ignore condition of the specified dependency and ignore conditions </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…Tools#985) - string formatters should use the same data as the JSON formatters - removed an extra space in network status

Refs ChromeDevTools#967 Closes ChromeDevTools#968

…d group (ChromeDevTools#986) Bumps the bundled group with 1 update: [puppeteer](https://github.com/puppeteer/puppeteer). Updates `puppeteer` from 24.37.3 to 24.37.4 <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/puppeteer/puppeteer/releases">puppeteer's releases</a>.</em></p> <blockquote> <h2>puppeteer-core: v24.37.4</h2> <h2><a href="https://github.com/puppeteer/puppeteer/compare/puppeteer-core-v24.37.3...puppeteer-core-v24.37.4">24.37.4</a> (2026-02-18)</h2> <h3>🛠️ Fixes</h3> <ul> <li><strong>cdp:</strong> add missing .catch(debugError) to void initialize() in onAttachedToTarget (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14701">#14701</a>) (<a href="https://github.com/puppeteer/puppeteer/commit/b8b1004764fed66f3aac9841da4aa5b001b4b221">b8b1004</a>)</li> <li>roll to Chrome 145.0.7632.76 (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14684">#14684</a>) (<a href="https://github.com/puppeteer/puppeteer/commit/6624d1dceae3c1ac0778b95e77810dd8c39df7a5">6624d1d</a>)</li> <li>roll to Firefox 147.0.4 (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14697">#14697</a>) (<a href="https://github.com/puppeteer/puppeteer/commit/eed313fc67d4e3b5c9b9440acb5b3262dac5e679">eed313f</a>)</li> </ul> <h3>Dependencies</h3> <ul> <li>The following workspace dependencies were updated <ul> <li>dependencies <ul> <li><code>@puppeteer/browsers</code> bumped from 2.12.1 to 2.13.0</li> </ul> </li> </ul> </li> </ul> <h2>puppeteer: v24.37.4</h2> <h2><a href="https://github.com/puppeteer/puppeteer/compare/puppeteer-v24.37.3...puppeteer-v24.37.4">24.37.4</a> (2026-02-18)</h2> <h3>♻️ Chores</h3> <ul> <li><strong>puppeteer:</strong> Synchronize puppeteer versions</li> </ul> <h3>Dependencies</h3> <ul> <li>The following workspace dependencies were updated <ul> <li>dependencies <ul> <li><code>@puppeteer/browsers</code> bumped from 2.12.1 to 2.13.0</li> <li>puppeteer-core bumped from 24.37.3 to 24.37.4</li> </ul> </li> </ul> </li> </ul> </blockquote> </details> <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/puppeteer/puppeteer/blob/main/CHANGELOG.md">puppeteer's changelog</a>.</em></p> <blockquote> <h2><a href="https://github.com/puppeteer/puppeteer/compare/puppeteer-v24.37.3...puppeteer-v24.37.4">24.37.4</a> (2026-02-18)</h2> <h3>♻️ Chores</h3> <ul> <li><strong>puppeteer:</strong> Synchronize puppeteer versions</li> </ul> <h3>Dependencies</h3> <ul> <li>The following workspace dependencies were updated <ul> <li>dependencies <ul> <li><code>@puppeteer/browsers</code> bumped from 2.12.1 to 2.13.0</li> </ul> </li> </ul> </li> </ul> <h3>🛠️ Fixes</h3> <ul> <li><strong>cdp:</strong> add missing .catch(debugError) to void initialize() in onAttachedToTarget (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14701">#14701</a>) (<a href="https://github.com/puppeteer/puppeteer/commit/b8b1004764fed66f3aac9841da4aa5b001b4b221">b8b1004</a>)</li> <li>roll to Chrome 145.0.7632.76 (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14684">#14684</a>) (<a href="https://github.com/puppeteer/puppeteer/commit/6624d1dceae3c1ac0778b95e77810dd8c39df7a5">6624d1d</a>)</li> <li>roll to Firefox 147.0.4 (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14697">#14697</a>) (<a href="https://github.com/puppeteer/puppeteer/commit/eed313fc67d4e3b5c9b9440acb5b3262dac5e679">eed313f</a>)</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/puppeteer/puppeteer/commit/c771d9cc0c6c3611532e18d89291c2d734f736ab"><code>c771d9c</code></a> chore: release main (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14688">#14688</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/e315ef69aac06a53659b50a2ebd426d0a47f1d63"><code>e315ef6</code></a> chore: disable blank issues (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14699">#14699</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/b8b1004764fed66f3aac9841da4aa5b001b4b221"><code>b8b1004</code></a> fix(cdp): add missing .catch(debugError) to void initialize() in onAttachedTo...</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/27d4bea32eb971b610fc7e225aea1b5ac3444e74"><code>27d4bea</code></a> test: fix of Windows and MacOS (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14698">#14698</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/eed313fc67d4e3b5c9b9440acb5b3262dac5e679"><code>eed313f</code></a> fix: roll to Firefox 147.0.4 (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14697">#14697</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/4b65f3acf6986c0ef093448cb343634180c675e3"><code>4b65f3a</code></a> chore: use the Type in issue template (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14691">#14691</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/c2eaedc74beeebf786a7583a7bfe2d923d741fb9"><code>c2eaedc</code></a> ci: track flaky from the UI (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14690">#14690</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/7f5e91cf2910ada4b91cd023e29e6e23f3766b3a"><code>7f5e91c</code></a> chore(deps): bump node from <code>1de022d</code> to <code>00e9195</code> in /docker in the all grou...</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/898ba7f957fa2117111378777ebc62e7f997b973"><code>898ba7f</code></a> chore: extract const in Dialog validation (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14689">#14689</a>)</li> <li><a href="https://github.com/puppeteer/puppeteer/commit/1ce908e424aff2e9a04250c26822ff66dedb636b"><code>1ce908e</code></a> feat: allow configuring the output of <code>@puppeteer/browsers</code> install (<a href="https://redirect.github.com/puppeteer/puppeteer/issues/14657">#14657</a>)</li> <li>Additional commits viewable in <a href="https://github.com/puppeteer/puppeteer/compare/puppeteer-v24.37.3...puppeteer-v24.37.4">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility 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…meDevTools#778) LLM are trained to know the common status code so we can rely on that when displaying the status code and fall back to text in case of errors or pending reponse.

…146 to 1.0.1585538 in the bundled-devtools group" (ChromeDevTools#990) Reverts ChromeDevTools#984 might be related to flakiness on macos.

… (refs ChromeDevTools#940)

madhaviai · 2026-02-18T19:06:50Z

@OrKoN , I Tested a variety of scenarios around MCP/tool invocation, including vague URL-based prompts mentioned below. The changes looked good in these cases. I’ve added corresponding eval updates in the PR as well. Appreciate you taking a look

Prompts I tested:
“Can you fix my webpage?” (no URL provided; current page context)
“Can you inspect this URL https://developer.chrome.com and get the content from the page?”
“Analyze the frontend behavior on this page.”
“Inspect the DOM/layout and suggest fixes

cc: @natorion

natorion

Thanks. lgtm from my end!

madhaviai · 2026-02-19T16:31:02Z

Thanks @natorion. @OrKoN I’ve rebased the branch on main just now. Happy to make any additional changes if needed.

OrKoN

thanks, left a couple of suggestions based on the discussions

madhaviai · 2026-02-27T21:23:11Z

Hey @OrKoN , I tested this across multiple models, including Gemini 2.5 Flash. With the updated file argument changes, it successfully picked up the Chrome DevTools MCP tools (list_pages) and was able to run the frontend flow correctly.

There is still some intermittency out of 5 runs, about 2 times it asked follow-up questions instead of directly invoking the tool but overall the behavior is significantly more consistent.

Please take a look at screenshots and lets see if the above changes can be merged.
cc: @natorion

I’ve attached screenshots for reference. Please take a look when you get a chance, and if everything looks good, we can proceed with merging the changes.

madhaviai · 2026-03-02T17:01:47Z

@OrKoN If you’re good with the current state, could we merge the invocability improvements into main?

OrKoN · 2026-03-03T06:58:01Z

@madhaviai please see suggestions I opened. Do you think they would work just as well? I find the phrasing If no URL given, ask to run from current directory or for the URL. to be not very clear as the URL is a required argument on the tool.

madhaviai

Yes comments can be updated according to suggestions, and they would work as expected.

madhaviai · 2026-03-03T14:50:58Z

Hey @OrKoN, I reviewed your description updates and tested them. The invocation is working well with these changes, and everything looks good on my side.

madhaviai · 2026-03-05T14:34:27Z

@OrKoN @natorion @jackfranklin This has been such a great collaboration with you. I enjoy contributing to this space. Feel free to pull me in to make impactful changes.

🤖 I have created a release *beep* *boop* --- ## [0.19.0](chrome-devtools-mcp-v0.18.1...chrome-devtools-mcp-v0.19.0) (2026-03-05) ### 🎉 Features * add pageId routing for parallel multi-agent workflows ([#1022](#1022)) ([caf601a](caf601a)), closes [#1019](#1019) * Add skill which helps with onboarding of the mcp server ([#1083](#1083)) ([7273f16](7273f16)) * integrate Lighthouse audits ([#831](#831)) ([dfdac26](dfdac26)) ### 🛠️ Fixes * improve error messages around --auto-connect ([#1075](#1075)) ([bcb852d](bcb852d)) * improve tool descriptions ([#965](#965)) ([bdbbc84](bdbbc84)) * repair broken markdown and extract snippets in a11y-debugging skill ([#1096](#1096)) ([adac7c5](adac7c5)) * simplify emulation and script tools ([#1073](#1073)) ([e51ba47](e51ba47)) * simplify focus state management ([#1063](#1063)) ([f763da2](f763da2)) * tweak lighthouse description ([#1112](#1112)) ([5538180](5538180)) ### 📄 Documentation * Adapt a11y skill to utilize Lighthouse ([#1054](#1054)) ([21634e6](21634e6)) * add feature release checklist to CONTRIBUTING.md ([#1118](#1118)) ([0378457](0378457)) * fix typo in README regarding slim mode ([#1093](#1093)) ([92f2c7b](92f2c7b)) ### 🏗️ Refactor * clean up more of the context getters ([#1062](#1062)) ([9628dab](9628dab)) * consistently use McpPage in tools ([#1057](#1057)) ([302e5a0](302e5a0)) * improve type safety for page scoped tools ([#1051](#1051)) ([5f694c6](5f694c6)) * make cdp resolvers use McpPage ([#1060](#1060)) ([d6c06c5](d6c06c5)) * move dialog handling to McpPage ([#1059](#1059)) ([40c241b](40c241b)) * move server to a separate file ([#1043](#1043)) ([a8bf3e5](a8bf3e5)) * remove page passing via context ([#1061](#1061)) ([4cb5a17](4cb5a17)) * set defaults to performance trace tool ([#1090](#1090)) ([dfa9b79](dfa9b79)) * simplify the response texts ([#1095](#1095)) ([cb0079e](cb0079e)) * type-cast as internal CdpPage interface ([#1064](#1064)) ([2d5e4fa](2d5e4fa)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

madhaviai changed the title ~~fix(mcp) : improve tool invocation reliability for agents~~ fix(mcp): improve tool invocation reliability for agents Feb 14, 2026

OrKoN requested a review from natorion February 16, 2026 08:17

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madhaviai added 2 commits February 18, 2026 11:39

fix(mcp) : improve tool invocation reliability for agents

50e813c

Addresses cases where DevTools MCP tools were not consistently picked up from natural language prompts by improving tool descriptions and metadata. Refs ChromeDevTools#940

fix(mcp): update Core Web Vitals references from FID to INP

42d30c2

Refs ChromeDevTools#940

OrKoN force-pushed the fix/940-improve-mcp-invocation branch from 46a5723 to 42d30c2 Compare February 18, 2026 10:39

dependabot bot and others added 10 commits February 18, 2026 14:00

refactor(network): de-duplicate String and JSON formatters (ChromeDev…

f099549

…Tools#985) - string formatters should use the same data as the JSON formatters - removed an extra space in network status

docs: update codex doc URL (ChromeDevTools#987)

bdfbf83

Refs ChromeDevTools#967 Closes ChromeDevTools#968

refactor: remove text from the status code for Network requests (Chro…

c4fa168

…meDevTools#778) LLM are trained to know the common status code so we can rely on that when displaying the status code and fall back to text in case of errors or pending reponse.

chore: clear in prepare (ChromeDevTools#988)

915b944

revert: "chore(deps-dev): bump chrome-devtools-frontend from 1.0.1583…

5ed9d51

…146 to 1.0.1585538 in the bundled-devtools group" (ChromeDevTools#990) Reverts ChromeDevTools#984 might be related to flakiness on macos.

test: fix missing sinon.restore (ChromeDevTools#989)

5a169bf

test(mcp): add eval scenarios for vague and URL-based webpage prompts…

7760d33

… (refs ChromeDevTools#940)

madhaviai requested review from OrKoN and natorion February 18, 2026 19:07

natorion approved these changes Feb 19, 2026

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OrKoN and others added 2 commits February 19, 2026 09:15

Merge branch 'main' into fix/940-improve-mcp-invocation

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Merge branch 'main' into fix/940-improve-mcp-invocation

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Merge branch 'main' into fix/940-improve-mcp-invocation

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OrKoN reviewed Feb 20, 2026

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Comment thread scripts/eval_scenarios/fix_webpage_issues_test.ts

OrKoN reviewed Feb 20, 2026

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madhaviai and others added 2 commits February 23, 2026 23:14

Merge branch 'main' into fix/940-improve-mcp-invocation

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Merge branch 'main' into fix/940-improve-mcp-invocation

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madhaviai and others added 2 commits February 27, 2026 15:45

Merge branch 'main' into fix/940-improve-mcp-invocation

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fix(mcp): Updated file system args

31e1a0f

Merge branch 'main' into fix/940-improve-mcp-invocation

04d4473

madhaviai commented Mar 3, 2026

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Comment thread scripts/eval_scenarios/fix_webpage_issues_test.ts

Comment thread src/tools/pages.ts Outdated

Comment thread src/tools/pages.ts Outdated

OrKoN added 2 commits March 4, 2026 18:16

Merge branch 'main' into fix/940-improve-mcp-invocation

1c277a2

Update src/tools/pages.ts

dff4104

OrKoN changed the title ~~fix(mcp): improve tool invocation reliability for agents~~ fix: improve tool descriptions Mar 4, 2026

OrKoN enabled auto-merge March 4, 2026 17:29

OrKoN approved these changes Mar 4, 2026

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OrKoN disabled auto-merge March 4, 2026 17:33

chore: fixes

6b8f361

OrKoN force-pushed the fix/940-improve-mcp-invocation branch from dc4be67 to 6b8f361 Compare March 4, 2026 17:34

OrKoN enabled auto-merge March 4, 2026 17:35

Daniel-u13 approved these changes Mar 4, 2026

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OrKoN added this pull request to the merge queue Mar 5, 2026

Merged via the queue into ChromeDevTools:main with commit bdbbc84 Mar 5, 2026
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browser-automation-bot mentioned this pull request Mar 4, 2026

chore(main): release chrome-devtools-mcp 0.19.0 #1048

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browser-automation-bot mentioned this pull request Mar 5, 2026

chore(main): release chrome-devtools-mcp 0.19.0 #1125

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