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cookie-debugging

Uses Chrome DevTools MCP for inspecting, debugging, and testing cookies, session state, authentication issues, and cookie consent compliance. Use when diagnosing 401/403 errors, authentication redirects, session expiration, Cookie/Set-Cookie header issues, cookie banner consent conformance, or third-party cookie/SameSite/Partitioned cookie warnings.

74

Quality

93%

Does it follow best practices?

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SecuritybySnyk

Low

Low-risk findings worth noting

SKILL.md
Quality
Evals
Security

Quality

Content

82%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is a strong, dense operational guide: every workflow is driven by concrete MCP tool calls with real parameters, executable JavaScript snippets, and a clever context-isolation strategy for clean-state testing. The only weaknesses are minor — some repeated advice that could be consolidated, a missing verify step in the client-side manipulation workflow, and content long enough that some audit detail could move to reference files.

DimensionReasoningScore

Conciseness

Nearly all content is non-obvious, tool-specific knowledge (pageId targeting, isolatedContext lifecycle, HttpOnly silent-failure behavior, cookieStore secure-context requirement) rather than concepts Claude already knows. Minor redundancy holds it below the top anchor: the isolatedContext advice and the HttpOnly-visibility point each repeat across the warning box, capability table, workflows, and troubleshooting.

4 / 5

Actionability

Guidance is fully executable: exact MCP tool names with concrete parameters ("includePreservedRequests: true", "types: [\"issue\"]", "isolatedContext: \"consent-test-1\""), copy-paste-ready cookieStore snippets with real arguments, and a specific node -e command that extracts the Lighthouse third-party-cookies audit without loading the full report.

5 / 5

Workflow Clarity

The four workflows are clearly numbered and sequenced, and the main ones include explicit checkpoints and feedback loops ("Verify if the Cookie header was attached", "Verify Cookie Difference", the mismatch-cause tracing in workflow 1). Minor gaps keep it below a 5: workflow 4's set/delete operations lack a verification step, and workflows 2-4 have little explicit error-recovery guidance.

4 / 5

Progressive Disclosure

The body is well-sectioned (Core Concepts, four Workflow Patterns, Troubleshooting) with everything at one level and no buried references, and no bundle files exist to organize. At ~150 lines, though, detail such as the Lighthouse deep-audit procedure and consent-lifecycle audit could be offloaded to reference files, fitting 'good structure; minor organization gaps' rather than the top anchor.

4 / 5

Total

17

/

20

Passed

Description

100%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is exemplary: it states what the skill does in third person, lists comprehensive concrete capabilities, and provides an explicit 'Use when' clause rich with natural trigger terms covering authentication failures, consent compliance, and cookie security warnings. It matches the structure and quality of the rubric's good examples with no weaknesses identified.

DimensionReasoningScore

Specificity

Names concrete actions ("inspecting, debugging, and testing") applied to specific objects — "cookies, session state, authentication issues, and cookie consent compliance" — giving comprehensive coverage of the skill's capabilities, matching the top anchor's multi-action example.

5 / 5

Completeness

Explicitly answers both questions: a third-person "what" ("Uses Chrome DevTools MCP for inspecting, debugging, and testing cookies...") and a concrete "Use when..." trigger clause listing specific diagnostic scenarios.

5 / 5

Trigger Term Quality

Includes the natural phrases users would say when needing this skill ("401/403 errors", "session expiration", "authentication redirects", "cookie banner consent") plus technical synonyms ("Cookie/Set-Cookie header", "SameSite", "Partitioned cookie"), with no common variation missing.

5 / 5

Distinctiveness Conflict Risk

Occupies a clear niche (Chrome DevTools MCP cookie/session debugging) with distinct triggers like Set-Cookie headers, SameSite warnings, and 401/403 diagnosis, making conflict with other skills minimal.

5 / 5

Total

20

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository

ChromeDevTools/chrome-devtools-mcp

Path

skills/cookie-debugging/SKILL.md

Reviewed

Table of Contents

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