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feat: Support truncation in get_heapsnapshot_details by dinfuehr · Pull Request #3137 · ChromeDevTools/chrome-devtools-mcp · GitHub
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feat: Support truncation in get_heapsnapshot_details - #3137

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dinfuehr merged 1 commit into
ChromeDevTools:mainfrom
dinfuehr:di/truncate-aggregate-names
Oct 14, 2026
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dinfuehr merged 1 commit into
ChromeDevTools:mainfrom
dinfuehr:di/truncate-aggregate-names

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@dinfuehr

@dinfuehr dinfuehr commented Oct 14, 2026 •

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Class names in get_heapsnapshot_details were never truncated. The tool now accepts maxNameLength and truncates class names to 100 characters by default (just like the other tools).

Since we are already here we can make this tool more uniform with the other tools. For this getAggregates() now returns a sorted array of plain HeapSnapshotAggregate objects. The formatter now uses a static formatAggregates() method.

Output changes:

  • CSV header: name is renamed to className.
  • Structured content: heapSnapshotData is renamed to heapSnapshotAggregates, and sizes are raw bytes instead of "x kB" strings.

@dinfuehr
dinfuehr force-pushed the di/truncate-aggregate-names branch from 2d0c486 to 136b14e Compare October 14, 2026 12:27

@Lightning00Blade Lightning00Blade left a comment

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LGTM, thanks!

@dinfuehr

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Thanks for the review!

@dinfuehr
dinfuehr added this pull request to the merge queue Oct 14, 2026
Merged via the queue into ChromeDevTools:main with commit f827e06 Oct 14, 2026
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@dinfuehr
dinfuehr deleted the di/truncate-aggregate-names branch October 14, 2026 13:26
OrKoN added a commit that referenced this pull request Oct 15, 2026
🤖 I have created a release *beep* *boop*
---


##
[1.11.0](chrome-devtools-mcp-v1.10.1...chrome-devtools-mcp-v1.11.0)
(2026-10-15)


### 🎉 Features

* add --file-navigations flag to reject file: URL navigations
([#2853](#2853))
([54cae57](54cae57))
* Add analyze_heapsnapshot_contexts MCP tool
([#2791](#2791))
([190aeee](190aeee))
* add ignoreCache option to performance_start_trace
([#2931](#2931))
([3467d40](3467d40))
* add maxNameLength truncation option to compare_heapsnapshots
([#3098](#3098))
([1e1c53e](1e1c53e))
* Add pagination to compare_heapsnapshots
([#3140](#3140))
([daebfd1](daebfd1))
* **config:** add ConfigWatcher to watch config file changes
([#3139](#3139))
([9171f77](9171f77))
* discover the config file in predefined locations
([#2876](#2876))
([02c0112](02c0112))
* implement ffmpeg-free screencast tools enabled by default
([#3123](#3123))
([8953ea5](8953ea5))
* reduce StaticText noise in text snapshots
([#2895](#2895))
([4441325](4441325))
* report pages opened by input actions
([#2679](#2679))
([28fb230](28fb230))
* resolve config defaults after merging CLI and config file
([#2849](#2849))
([bdeb70d](bdeb70d))
* return failing audits and DOM nodes inline from lighthouse_audit
([#2930](#2930))
([241fba5](241fba5))
* skip more redundant data in text snapshots
([#2896](#2896))
([b2f522c](b2f522c))
* support debugging WebMCP tools in third-party developer tools
([#2900](#2900))
([0db519f](0db519f))
* support emulating additional CSS media features
([#2929](#2929))
([69524f0](69524f0))
* support evaluating scripts from local files
([#2606](#2606))
([9cf47a4](9cf47a4))
* Support truncation in get_heapsnapshot_details
([#3137](#3137))
([f827e06](f827e06))
* Truncate long names by default to 100 characters
([#2893](#2893))
([5ddb0a3](5ddb0a3))


### 🛠️ Fixes

* account for scroll offsets in downscaled screenshots
([#2685](#2685))
([830c693](830c693))
* allow --categoryExtensions when connecting to an existing browser
([#3041](#3041))
([d250bc5](d250bc5))
* allow stopping the CLI if command fails
([#3088](#3088))
([77e238e](77e238e)),
closes
[#2982](#2982)
* avoid runtime title fetches
([#2883](#2883))
([04195d1](04195d1))
* better config support for chrome-devtools CLI
([#2819](#2819))
([9624e64](9624e64))
* clamp async stack trace separator repeat count
([#3035](#3035))
([93e06ab](93e06ab)),
closes
[#3031](#3031)
* **cli:** pass positional values starting with `-` through to tools
([#3084](#3084))
([9de05ae](9de05ae)),
closes
[#2984](#2984)
* **collectors:** ignore transient target errors when subscribing to
service workers
([#2888](#2888))
([551dd6c](551dd6c))
* **daemon:** bound browser shutdown and avoid watchFile timeout on stop
([#2887](#2887))
([f3db5e7](f3db5e7))
* **daemon:** keep fallback socket in private runtime dir
([#2766](#2766))
([871a37e](871a37e))
* **daemon:** verify process identity before treating PID file as active
([#3109](#3109))
([b608bed](b608bed))
* do not close a healthy browser when a tool call outlasts 60s
([#3149](#3149))
([39c7db1](39c7db1))
* ensure aggregate IDs in heap snapshots are deterministic
([#2923](#2923))
([e918c47](e918c47))
* escape client-supplied values in McpContext logs and errors
([#2832](#2832))
([efb0d02](efb0d02)),
closes
[#2831](#2831)
* fail fast on tool calls stuck after a dead browser connection
([#2699](#2699))
([2a7ef50](2a7ef50))
* harden third-party tool result serialization
([#2892](#2892))
([4418a7b](4418a7b))
* honor explicit --allowUnrestrictedPaths=false in CLI mode
([#3040](#3040))
([61fc362](61fc362))
* include errors in slim responses
([#3085](#3085))
([ee38097](ee38097))
* **input:** reject multiple file paths on single-file input in
upload_file
([#2995](#2995))
([#3135](#3135))
([e650843](e650843))
* list fresh page titles
([#3103](#3103))
([e717082](e717082))
* **memory:** reject contradictory pagination options in
take_heapsnapshot
([#3002](#3002))
([#3131](#3131))
([508126c](508126c))
* **network:** enforce URL policy across redirects
([#2767](#2767))
([274cd4c](274cd4c))
* pass categoryExtensions to the target filter when connecting
([#3047](#3047))
([4e90238](4e90238))
* **performance:** report an error when performance_stop_trace is called
with no active trace
([#3001](#3001))
([#3126](#3126))
([e170384](e170384))
* preserve HeapSnapshotManager across browser reconnects
([#3025](#3025))
([64388c6](64388c6))
* propagate failed responseFilePath write error instead of reporting
body unavailable
([#2957](#2957))
([#3119](#3119))
([3cee3bd](3cee3bd))
* **pwa:** wait for initial navigation on launch and retry transient
install error
([#2889](#2889))
([63010cb](63010cb))
* record screencast at the page's device pixel size
([#3155](#3155))
([62e2aa4](62e2aa4))
* reject --blockedUrlPattern/--allowedUrlPattern hostname regexp groups
([#2796](#2796))
([ae0aaef](ae0aaef))
* reject JSON arrays as 3p and WebMCP tool params
([#2785](#2785))
([c14e616](c14e616))
* reject named groups in URL patterns
([#2857](#2857))
([5b2c6f9](5b2c6f9))
* reject non-positive --viewport dimensions
([#2781](#2781))
([0ef528a](0ef528a))
* reject non-positive resize_page dimensions
([#2784](#2784))
([6ab6d35](6ab6d35))
* reject unrestricted paths with an explicit workspace
([#2858](#2858))
([45c1c6c](45c1c6c))
* report unknown page id before last-page guard in close_page
([#3042](#3042))
([bdc7e24](bdc7e24))
* round lighthouse category scores and show unscored categories as n/a
([#2924](#2924))
([7007680](7007680)),
closes
[#2915](#2915)
[#2916](#2916)
* set empty filePath to undefined instead of empty string
([#2836](#2836))
([adfc1ff](adfc1ff)),
closes
[#2825](#2825)
* surface WebMCP tool exceptions in execute_webmcp_tool
([#3107](#3107))
([d80d22e](d80d22e)),
closes
[#2975](#2975)
* url pattern partial ipv4
([#2859](#2859))
([c87d190](c87d190))


### 📄 Documentation

* clarify Antigravity MCP setup for VS Code extension
([#2855](#2855))
([12e13ca](12e13ca))
* clarify scope of --no-javascript-evaluation
([#3100](#3100))
([0c67cd5](0c67cd5))
* correct link to configuration
([#3086](#3086))
([bbb1e36](bbb1e36))
* document trusted host environment in SECURITY.md
([#3125](#3125))
([1352207](1352207))
* fix inaccurate examples in skills and CLI docs
([#2922](#2922))
([ec372b0](ec372b0)),
closes
[#2906](#2906)
[#2907](#2907)
[#2908](#2908)
[#2910](#2910)
[#2912](#2912)
[#2913](#2913)
[#2918](#2918)
[#2919](#2919)
[#2920](#2920)
[#2921](#2921)
* fix some reported issues
([#3099](#3099))
([d5d2f08](d5d2f08))
* include serviceWorkerId parameter for evaluate_script
([#3015](#3015))
([#3129](#3129))
([0623434](0623434))
* mention heapsnapshot being cached between runs
([#3045](#3045))
([f08dbe1](f08dbe1)),
closes
[#2976](#2976)
* **skills:** remove invalid outputDir flag from lighthouse_audit calls
([#3013](#3013))
([#3130](#3130))
([7754226](7754226))
* update documentation and SKILL for get_css_styles tool
([#2824](#2824))
([3c12a91](3c12a91))


### ⚡ Performance

* **cli:** re-use MCPServer.from helpers for daemon
([#2804](#2804))
([89eb3d5](89eb3d5))
* Load heap snapshots in parallel in compare_heapsnapshots
([#3023](#3023))
([20c1391](20c1391))


### 🏗️ Refactor

* centralize config defaults and conflict checks
([#2753](#2753))
([a739ba8](a739ba8))
* create all tools and register per slim mode
([#2874](#2874))
([99847a7](99847a7))
* enable categories by default
([#2811](#2811))
([e33ee48](e33ee48))
* extract CLI examples and conflict list in mcp-options
([#2848](#2848))
([45000d9](45000d9))
* extract config parsing logic in a class
([#2861](#2861))
([e4168d0](e4168d0))
* extract worker logic into McpWorker
([#2800](#2800))
([77165c6](77165c6))
* group Puppeteer and tool options
([#2875](#2875))
([699c4d5](699c4d5))
* lazily initialize McpPage from Target and enumerate targets in
McpContext
([#2812](#2812))
([545cbe3](545cbe3))
* use default Error for toolSchema
([#2822](#2822))
([8b2768d](8b2768d))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: Alex Rudenko <OrKoN@users.noreply.github.com>
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