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adding-mcp-store-servers

Add a third-party MCP server (Linear, Notion, GitHub, ...) to the PostHog MCP store catalog. Use when asked to "add X to the MCP store", expand the MCP server marketplace, or fix a broken catalog entry. Covers finding the vendor's remote MCP endpoint, probing it (handshake, OAuth discovery, DCR), authoring the catalog entry in products/mcp_store/backend/catalog.py, verification tiers, and the operator handoff for servers without Dynamic Client Registration.

73

Quality

90%

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SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Quality

Content

88%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.

A lean, highly actionable multi-step workflow with explicit validation, feedback loops, and checklists. It is well-structured with clear one-level references; the only soft spots are minor conciseness trims and the inlined checklist.

DimensionReasoningScore

Conciseness

Efficient and assumes competence — it skips generic concepts and uses concrete commands and tight verdict mappings — but a few of the auth_flavor bullets are long and could be tightened without losing meaning.

4 / 5

Actionability

Fully executable guidance: concrete probe/test commands, exact file paths, explicit field-by-field entry authoring with acceptable values, verification tiers, and a paste-ready operator checklist — covering the common auth_flavor cases.

5 / 5

Workflow Clarity

A six-step sequence with explicit validation checkpoints (probe verdicts telling you to 'Stop and re-research', test_catalog_entries_are_valid catching bad entries pre-prod), error-recovery feedback loops, and a literal checklist for the operator handoff.

5 / 5

Progressive Disclosure

Well-organized into sections with one-level-deep 'Read first' pointers to README.md, catalog.py, and probe.py; minor gap is the inlined operator checklist, which could be signaled as a separable block, and there are no dedicated bundle reference files beyond the repo pointers.

4 / 5

Total

18

/

20

Passed

Description

92%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.

A strong, specific description that explicitly covers both capability and trigger conditions with natural user phrasing and a clear, low-conflict niche. The only minor gap is trigger-term breadth, which is already strong.

DimensionReasoningScore

Specificity

Lists multiple specific concrete actions — 'finding the vendor's remote MCP endpoint', 'probing it (handshake, OAuth discovery, DCR)', 'authoring the catalog entry in products/mcp_store/backend/catalog.py', 'verification tiers', and 'the operator handoff' — giving comprehensive coverage rather than just a few actions.

5 / 5

Completeness

Explicitly answers both what ('Add a third-party MCP server ... to the PostHog MCP store catalog. Covers ...') and when ('Use when asked to ...') with concrete trigger phrases, matching the top anchor.

5 / 5

Trigger Term Quality

Includes natural trigger phrasings users would say ('Use when asked to "add X to the MCP store"', 'expand the MCP server marketplace, or fix a broken catalog entry') with good synonym coverage, though it lacks the file-extension/synonym breadth that marks the top anchor.

4 / 5

Distinctiveness Conflict Risk

Occupies a clear niche (PostHog MCP store catalog, a specific file path, named vendors) with distinct triggers and minimal overlap risk with other skills.

5 / 5

Total

19

/

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.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
PostHog/posthog
Reviewed

Table of Contents

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