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fix(cli): pass positional values starting with - through to tools - #3084
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maybe @Lightning00Blade for a review as well |
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First thought: Did you consider replacing yargs with either node-native commandline parsing or with command.js for example? |
Yes, yargs has a lot of features that we and our users depend on and that are difficult to maintain 100% the same and the built-in parser did not have the same capabilities across versions (and in general has more limited feature set). |
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Last I remember there were quite a few thing that Yargs just handles. One possibility is that we can use only |
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Maybe we could move the CLI interface off yargs only? |
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I found the fix working well in all cases. There are some different error messages in some cases, but that's acceptable.
I think that's a good idea to explore too. |
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Updated PTAL |
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Lightning00Blade
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LGTM, just need that test to be split.
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`chrome-devtools fill 1 <uid> -` reported success but cleared the field, `type_text 1 -` typed an empty string, and values like `--weird` could not be passed at all, not even after `--`. yargs re-parses command positionals as `--name value` pairs. In that pass yargs-parser treats any value starting with `-` (other than a negative number) as the next flag and substitutes the string default `''`. yargs also never fills positionals from the tokens after `--`. Neither can be fixed via configuration (`unknown-options-as-args` and `nargs` hit the same re-parse), and the upstream fix for the lone `-` (yargs/yargs-parser#472) is unreleased and only covers that one case. The CLI now shields such tokens before yargs sees them: a lone `-` is always shielded, and everything after the first `--` is shielded with the separator dropped. Shielded tokens are replaced by opaque placeholders and restored when building the tool arguments. Unknown flags such as `--weird` or `--pageid` without `--` are still rejected by strict mode; the error tip and docs/cli.md now explain the `--` form. Related upstream issues: - yargs/yargs#1312 - yargs/yargs#1821 - yargs/yargs-parser#472 Fixes #2984
Instead of requiring `--` before a value such as `--flag`, the CLI now decides per token: a dash-prefixed token that is not a known option of the command (its optional args, --sessionId, --output-format, --help, --version, in camel/kebab/negated form) and arrives while the command still has an unfilled positional is treated as a positional value. Known options and their values are skipped the way yargs consumes them. Unknown flags after all positionals are filled, and on `start`, `stop` and `status`, are still rejected by strict mode. `--` keeps working.
Generate a `positional` field per arg in cli-options.ts instead of resolving it at runtime, and share the global CLI options between the bin and the tests.
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🤖 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>
chrome-devtools fill 1 <uid> -reported success but cleared the field,type_text 1 -typed an empty string, and values like--weirdcould not be passed at all, not even after--.yargs re-parses command positionals as
--name valuepairs. In that pass yargs-parser treats any value starting with-(other than a negative number) as the next flag and substitutes the string default''. yargs also never fills positionals from the tokens after--. Neither can be fixed via configuration (unknown-options-as-argsandnargshit the same re-parse), and the upstream fix for the lone-(yargs/yargs-parser#472) is unreleased and only covers that one case.The CLI now shields such tokens before yargs sees them: a lone
-is always shielded, and everything after the first--is shielded with the separator dropped. Shielded tokens are replaced by opaque placeholders and restored when building the tool arguments. Unknown flags such as--weirdor--pageidwithout--are still rejected by strict mode; the error tip and docs/cli.md now explain the--form.Related upstream issues:
Fixes #2984