Official agent skill

Testing MCP Tools Locally

by PostHog in PostHog/posthog

Set up the local dev environment, seed data, and API keys to test the staff-only managed migrations MCP tools (managed-migrations-support-list, managed-migrations-support-get) end to end.

OfficialCustom licenceAuto-check passedAgent Workflows

Install Testing MCP Tools Locally

skills CLI
$ npx skills add PostHog/posthog --skill testing-mcp-tools-locally -a claude-code

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

GitHub CLI
$ gh skill install PostHog/posthog testing-mcp-tools-locally --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/.agents/skills/testing-mcp-tools-locally .claude/skills/testing-mcp-tools-locally && 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
testing-mcp-tools-locally
GitHub stars
40k
Token cost
~2.3k tokens
SKILL.md length
793 words
Files
2 (incl. references)
Skills in repo
252
Repo updated
First seen
Licence
Custom licence

At a glance

Set up the local dev environment, seed data, and API keys to test the staff-only managed migrations MCP tools (managed-migrations-support-list, managed-migrations-support-get) end to end.

  • Works in 7 steps: Start the dev environment → Run Postgres migrations → Verify DB connectivity from the Django… → …
  • Testing batch import support tooling
  • SKILL.md covers Prerequisites, 1. Start the dev environment, 2. Run Postgres migrations and 3. Verify DB connectivity from…, plus 5 more sections
  • Calls pnpm, curl and jq

What it does

Testing MCP Tools Locally is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Set up the local dev environment, seed data, and API keys to test the staff-only managed migrations MCP tools (managed-migrations-support-list, managed-migrations-support-get) end to end. Use when testing batch import support tooling, debugging MCP tool responses or discovery (tools not appearing), or verifying the support API before deploying. Covers the discovery gate: hidden scope, isstaff, user:read, and why wildcard keys and OAuth never work.

Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/seed-data.md`).

It sits in Agent Workflows, covering MCP servers and Test data and fixtures. It works with PostgreSQL. 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

  • Testing batch import support tooling
  • Debugging MCP tool responses
  • Discovery (tools not appearing)
  • Verifying the support API before deploying

Example prompts

  • “/testing-mcp-tools-locally”

Requirements

  • Python 3
  • Node.js
  • Docker

Workflow steps

7 steps, taken from the step headings in SKILL.md.

  1. Start the dev environment
  2. Run Postgres migrations
  3. Verify DB connectivity from the Django shell
  4. Seed batch import test data
  5. Make your user staff and mint test keys
  6. Test the API directly
  7. Test via MCP

What it can do on your machine

Read from SKILL.md and the folder at commit 812e5c6. 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

    Shell commands in SKILL.md call:

    • pnpm
    • curl
    • jq
    • npx
    • docker

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

  • Network

    No URLs in SKILL.md. Its commands use pnpm, curl, npx and docker, which can reach the network depending on how they are called.

    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.

Context cost

Testing MCP Tools Locally loads about 2.3k tokens when it runs, and up to ~4.1k if it reads all its reference files. Until then it costs about 120 tokens; SKILL.md has 793 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~120
When it runs · the whole SKILL.md, loaded when a task matches
~2.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.1k

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 793 words (~2,312 tokens).

“The dev environment must be running with Docker services healthy. The batch import support API and MCP tools require:”

— opening of SKILL.md by PostHog, Custom licence
name
testing-mcp-tools-locally

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file (references) in .agents/skills/testing-mcp-tools-locally of PostHog/posthog.

  • SKILL.md
  • references/seed-data.md

Open the folder on GitHubat commit 812e5c6

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

Testing MCP Tools Locally 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.

Testing MCP Tools Locally compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Testing MCP Tools Locally this skillPostHog/posthog40k—~2.3kAutomated safety check: PassCustom licence
AgentSkillsHub Skill Finderzhuyansen/agent-skills-hub410—~1kAutomated safety check: PassMIT
Ogham Researchogham-mcp/ogham-mcp115—~1.4kAutomated safety check: PassMIT
Lunoraanolilab/lunora282—~2.6kAutomated safety check: PassCustom licence
Use Gfs MCPGuepard-Corp/gfs158—~4kAutomated safety check: PassMIT
Ogham Maintainogham-mcp/ogham-mcp115—~1.1kAutomated safety check: PassMIT

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Works with

Questions about Testing MCP Tools Locally

What does Testing MCP Tools Locally do?

Set up the local dev environment, seed data, and API keys to test the staff-only managed migrations MCP tools (managed-migrations-support-list, managed-migrations-support-get) end to end. Testing MCP Tools Locally is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Set up the local dev environment, seed data, and API keys to test the staff-only managed migrations MCP tools (managed-migrations-support-list, managed-migrations-support-get) end to end.

When should I use Testing MCP Tools Locally?

Testing MCP Tools Locally fits situations like: testing batch import support tooling; debugging MCP tool responses; discovery (tools not appearing); verifying the support API before deploying.

How do I install Testing MCP Tools Locally in Claude Code?

Run `npx skills add PostHog/posthog --skill testing-mcp-tools-locally -a claude-code`. Or copy the skill folder (.agents/skills/testing-mcp-tools-locally in PostHog/posthog) into .claude/skills/testing-mcp-tools-locally in your project. Claude Code loads it when a task matches its description.

How do I install Testing MCP Tools Locally in Codex?

Run `npx skills add PostHog/posthog --skill testing-mcp-tools-locally -a codex`. Or copy the skill folder (.agents/skills/testing-mcp-tools-locally in PostHog/posthog) into .agents/skills/testing-mcp-tools-locally in your project. Codex loads it when a task matches its description.

Can I use Testing MCP Tools Locally 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 testing-mcp-tools-locally -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/testing-mcp-tools-locally, .gemini/skills/testing-mcp-tools-locally, .github/skills/testing-mcp-tools-locally and .opencode/skills/testing-mcp-tools-locally in your project.

What does Testing MCP Tools Locally need to run?

Going by SKILL.md and its folder, Testing MCP Tools Locally needs the command-line tools its instructions call (pnpm, curl, jq, npx and docker). Our summary lists: Python 3; Node.js; Docker.

Does Testing MCP Tools Locally access the network?

SKILL.md contains no URLs. Its commands use curl, npx and docker, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Testing MCP Tools Locally 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 Testing MCP Tools Locally use?

Testing MCP Tools Locally 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 Testing MCP Tools Locally use?

About 2.3k tokens (SKILL.md is roughly 9.2k 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 1.8k tokens, read only when the agent opens those files.

What are the alternatives to Testing MCP Tools Locally?

Skills that share tags, products or a category with Testing MCP Tools Locally: AgentSkillsHub Skill Finder (zhuyansen/agent-skills-hub, 410 stars), Ogham Research (ogham-mcp/ogham-mcp, 115 stars), Lunora (anolilab/lunora, 282 stars) and Use Gfs MCP (Guepard-Corp/gfs, 158 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Testing MCP Tools Locally?

PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,200 GitHub stars. The repository holds 252 skills in this directory. The repository was last updated on October 9, 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.