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Official agent skill

Signals Scout Web Vitals

by PostHog in PostHog/posthog

Signals scout for Core Web Vitals ($webvitals). An agent skill from PostHog/posthog.

OfficialCustom licenceAuto-check passedFrontend & Design

Install Signals Scout Web Vitals

skills CLI
$ npx skills add PostHog/posthog --skill signals-scout-web-vitals -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install PostHog/posthog signals-scout-web-vitals --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/products/signals/skills/signals-scout-web-vitals .claude/skills/signals-scout-web-vitals && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
signals-scout-web-vitals
GitHub stars
40k
Token cost
~11k tokens
SKILL.md length
5,301 words
Files
3 (incl. references)
Skills in repo
254
Repo updated
First seen
Licence
Custom licence

At a glance

Signals scout for Core Web Vitals ($webvitals). An agent skill from PostHog/posthog.

  • Works in 2 steps: There is an absolute, published… → A percentile is only trustworthy with…
  • Tasks that involve Web performance
  • SKILL.md covers Activity-history availability, Quick close-out: is web vitals…, How a run works and Disqualifiers (skip these), plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Signals Scout Web Vitals is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Signals scout for Core Web Vitals ($webvitals). Watches each page's p75 LCP / INP / CLS / FCP against Google's thresholds and its own history — poor-band pages, band crossings, sharp regressions — and dates each regression against deploys and flag rollouts.

Its SKILL.md is about 11k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/onset-correlation.md` and `references/remediation.md`). Compatibility notes: Designed for the PostHog Signals agent in a Claude sandbox with PostHog MCP scopes: read-only analytics plus signalscoutinternal:write (for scratchpad) +…

It sits in Frontend & Design, covering Web performance. The repository describes itself as: :hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error…

When your agent uses it

  • Tasks that involve Web performance

Example prompts

  • “s p75 LCP / INP / CLS / FCP against Google”
  • “Use the signals-scout-web-vitals skill to signal scout for Core Web Vitals ($webvitals). An agent skill from PostHog/posthog”
  • “/signals-scout-web-vitals”

Requirements

  • Compatibility (from SKILL.md): Designed for the PostHog Signals agent in a Claude sandbox with PostHog MCP scopes: read-only analytics plus signal_scout_internal:write (for scratchpad) + signal_scout_report:write (for emit-report/edit-report, granted because this scout authors reports directly via the report channel). Assumes the signals-scout MCP family and standard analytics tools (execute-sql against the events table, read-data-schema, advanced-activity-logs-list, and the inbox tools in the MCP tools section).

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

  1. There is an absolute, published threshold — you don't only hunt anomalies. A page
  2. A percentile is only trustworthy with volume. p75 on 30 samples is noise; p75 on

What it can do on your machine

Read from SKILL.md and the folder at commit c012c8d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are sql).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for the PostHog Signals agent in a Claude sandbox with PostHog MCP scopes: read-only analytics plus signal_scout_internal:write (for scratchpad) + signal_scout_report:write (for emit-report/edit-report, granted because this scout authors reports directly via the report channel). Assumes the signals-scout MCP family and standard analytics tools (execute-sql against the events table, read-data-schema, advanced-activity-logs-list, and the inbox tools in the MCP tools section).

    From compatibility in the SKILL.md frontmatter.

Context cost

Signals Scout Web Vitals loads about 11k tokens when it runs, and up to ~14k if it reads all its reference files. Until then it costs about 71 tokens; SKILL.md has 5,301 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~71
When it runs · the whole SKILL.md, loaded when a task matches
~11k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~14k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 5,301 words (~10,750 tokens).

“You are a focused Core Web Vitals scout. The web analytics product scores each page on four metrics against fixed Google thresholds; your job is to find the pages that are slow against those thresholds — whether they just regressed…”

— opening of SKILL.md by PostHog, Custom licence
name
signals-scout-web-vitals
compatibility
Designed for the PostHog Signals agent in a Claude sandbox with PostHog MCP scopes: read-only analytics plus signal_scout_internal:write (for scratchpad) + signal_scout_report:write (for emit-report/edit-report, granted because this scout authors reports directly via the report channel). Assumes the signals-scout MCP family and standard analytics tools (execute-sql against the events table, read-data-schema, advanced-activity-logs-list, and the inbox tools in the MCP tools section).
scout-display-name
Web vitals
metadata.owner_team
signals
metadata.scope
web_vitals

Read the full SKILL.md on GitHub

Files

SKILL.md and 2 other files (references) in products/signals/skills/signals-scout-web-vitals of PostHog/posthog.

  • SKILL.md
  • references/onset-correlation.md
  • references/remediation.md

Open the folder on GitHubat commit c012c8d

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in PostHog/posthog, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Signals Scout Web Vitals next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Signals Scout Web Vitals compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Signals Scout Web Vitals this skillPostHog/posthog40k—~11kAutomated safety check: PassCustom licence
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Fixing Motion Performanceibelick/ui-skills9.6k5 repos~1.4kAutomated safety check: PassMIT
GSAP Performance Tuninggreensock/gsap-skills16k3 repos~1kAutomated safety check: PassMIT
React Frontend Development Guidelinesdiet103/claude-code-infrastructure-showcase10k2 repos~2.9kAutomated safety check: PassMIT
Web Quality Auditaddyosmani/web-quality-skills2.9k—~2.6kAutomated safety check: PassMIT

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Categories

Questions about Signals Scout Web Vitals

What does Signals Scout Web Vitals do?

Signals scout for Core Web Vitals ($webvitals). An agent skill from PostHog/posthog. Signals Scout Web Vitals is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Signals scout for Core Web Vitals ($webvitals).

When should I use Signals Scout Web Vitals?

Signals Scout Web Vitals fits situations like: tasks that involve Web performance.

How do I install Signals Scout Web Vitals in Claude Code?

Run `npx skills add PostHog/posthog --skill signals-scout-web-vitals -a claude-code`. Or copy the skill folder (products/signals/skills/signals-scout-web-vitals in PostHog/posthog) into .claude/skills/signals-scout-web-vitals in your project. Claude Code loads it when a task matches its description.

How do I install Signals Scout Web Vitals in Codex?

Run `npx skills add PostHog/posthog --skill signals-scout-web-vitals -a codex`. Or copy the skill folder (products/signals/skills/signals-scout-web-vitals in PostHog/posthog) into .agents/skills/signals-scout-web-vitals in your project. Codex loads it when a task matches its description.

Can I use Signals Scout Web Vitals in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add PostHog/posthog --skill signals-scout-web-vitals -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/signals-scout-web-vitals, .gemini/skills/signals-scout-web-vitals, .github/skills/signals-scout-web-vitals and .opencode/skills/signals-scout-web-vitals in your project.

What does Signals Scout Web Vitals need to run?

SKILL.md names no scripts, command-line tools or credentials: Signals Scout Web Vitals is instructions for the agent only. Compatibility (from SKILL.md): Designed for the PostHog Signals agent in a Claude sandbox with PostHog MCP scopes: read-only analytics plus signal_scout_internal:write (for scratchpad) + signal_scout_report:write (for emit-report/edit-report, granted because this scout authors reports directly via the report channel). Assumes the signals-scout MCP family and standard analytics tools (execute-sql against the events table, read-data-schema, advanced-activity-logs-list, and the inbox tools in the MCP tools section). .

Does Signals Scout Web Vitals access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Signals Scout Web Vitals safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Signals Scout Web Vitals use?

Signals Scout Web Vitals has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Signals Scout Web Vitals use?

About 11k tokens (SKILL.md is roughly 43k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.6k tokens, read only when the agent opens those files.

What are the alternatives to Signals Scout Web Vitals?

Skills that share tags, products or a category with Signals Scout Web Vitals: React Doctor (makeplane/plane, 61k stars), Fixing Motion Performance (ibelick/ui-skills, 9.6k stars), GSAP Performance Tuning (greensock/gsap-skills, 16k stars) and React Frontend Development Guidelines (diet103/claude-code-infrastructure-showcase, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Signals Scout Web Vitals?

PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,209 GitHub stars. The repository holds 254 skills in this directory. The repository was last updated on October 10, 2026.

Source: PostHog/posthog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.