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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.

80

Quality

100%

Does it follow best practices?

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SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Quality

Content

100%

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

A dense, well-sequenced workflow that gives concrete commands, explicit validation gates, and copy-paste artifacts with no explanatory padding. It reads as a competent runbook — every step earns its place and error recovery is built in.

DimensionReasoningScore

Conciseness

Lean and efficient throughout — no preamble explaining what MCP or OAuth is, every line instructs; assumes Claude's competence, so it matches the 'every token earns its place' anchor rather than the 'mostly efficient but could be tightened' level below.

3 / 3

Actionability

Fully executable guidance — copy-paste commands ('DEBUG=1 python manage.py probe_mcp_server ...', 'hogli test products/mcp_store/backend/test/test_catalog_sync.py'), exact field-by-field authoring rules, and a ready-to-paste operator checklist — matching the 'fully executable code/commands; copy-paste ready' anchor.

3 / 3

Workflow Clarity

Six clearly sequenced steps with explicit validation checkpoints — the probe verdict mapping drives the auth_type decision, test_catalog_entries_are_valid catches malformed entries, Gate B verification and tiers are defined, and a what-not-to-do section guards risky edits — matching the 'clear sequence with explicit validation steps' anchor.

3 / 3

Progressive Disclosure

A single self-contained SKILL.md with well-organized sections (Read first, Workflow, Operator checklist, What not to do); its 'Read first' pointers are to repo files rather than nested bundle references, and the body is concise enough to score 3 per the simple-skill scoring note.

3 / 3

Total

12

/

12

Passed

Description

100%

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 highly specific, third-person description that pairs concrete capability lists with explicit user-facing trigger phrases, cleanly answering both what the skill does and when to invoke it. No fluff, no over-claims, and a distinct niche that minimizes conflict risk.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — 'finding the vendor's remote MCP endpoint, probing it (handshake, OAuth discovery, DCR), authoring the catalog entry', 'verification tiers, and the operator handoff' — matching the 'lists multiple specific concrete actions' anchor rather than the 'domain and some actions' level below.

3 / 3

Completeness

Explicitly answers both what ('Add a third-party MCP server ... Covers finding ... authoring ... verification tiers ...') and when ('Use when asked to ...'), matching the 'clearly answers both what AND when with explicit triggers' anchor.

3 / 3

Trigger Term Quality

Includes natural user phrasings — 'asked to "add X to the MCP store"', 'expand the MCP server marketplace', 'fix a broken catalog entry' — covering the terms a user would actually say, meeting the 'good coverage of natural terms' anchor.

3 / 3

Distinctiveness Conflict Risk

A clear narrow niche — the PostHog MCP store catalog — with distinct, specific triggers, making it unlikely to fire for the wrong skill.

3 / 3

Total

12

/

12

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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