Pydantic Skills

Logfire and Pydantic AI plugins for Claude Code, Codex, and Cursor. Instrument your code with Logfire, query and export the resulting telemetry, and build LLM agents with Pydantic AI.

Plugins

| Plugin | Hosts | Description | Capabilities | | --------------------------------------------- | -------------------------- | --------------------------------------------------- | ------------------------------------------------------------------------------------ | | logfire | Claude Code, Codex, Cursor | Add Logfire observability and query/debug telemetry | Claude commands /instrument, /debug, /query; Codex/Cursor skills and MCP tools | | logfire-exporter | Codex | Export Codex activity traces to Logfire | Codex lifecycle hooks | | ai | Claude Code | Build AI agents with Pydantic AI | Pydantic AI skill docs | | pydantic-ai-harness | Claude Code | Extend Pydantic AI agents with harness capabilities (Code Mode) | Pydantic AI Harness skill docs |

Install In Claude Code

Add this marketplace to Claude Code:

claude plugin marketplace add pydantic/skills

Then install a plugin:

claude plugin install logfire@pydantic-skills
claude plugin install ai@pydantic-skills
claude plugin install pydantic-ai-harness@pydantic-skills

Install In Codex

Add the published Pydantic marketplace to Codex:

codex plugin marketplace add pydantic/skills

Then open Codex's plugin UI and enable the plugins you want from the Pydantic marketplace:

• Logfire - installs Logfire skills and the hosted Logfire MCP server.
• Logfire Exporter - installs Codex lifecycle hooks that export completed Codex turns and tool calls to Logfire.

Configure Logfire Exporter with a Logfire write token in your environment or

${XDG_CONFIG_HOME:-~/.config}/logfire-exporter/config.env. Restart Codex after configuration, and run /hooks if Codex asks you to review or trust the new hooks.

To use the EU Logfire MCP endpoint in Codex without editing plugin files, replace the MCP entry and re-authenticate:

codex mcp remove logfire
codex mcp add logfire --url https://logfire-eu.pydantic.dev/mcp
codex mcp login logfire
codex mcp get logfire

Start a new Codex conversation after switching so the MCP tools reload.

Install In Cursor

Install the Logfire plugin from the published pydantic/skills repository:

git clone https://github.com/pydantic/skills.git
mkdir -p ~/.cursor/plugins/local
cp -R skills/plugins/logfire ~/.cursor/plugins/local/logfire

Then restart Cursor or run Developer: Reload Window. The plugin configures:

• display name Logfire
• Logfire skills for instrumentation, querying, and UI-opening workflows
• hosted Logfire MCP server from mcp.json

The Logfire MCP server requires normal Logfire authentication, such as logfire auth or a suitable LOGFIRE_TOKEN.

Cross-Agent Skills

The skills/ directory contains standalone SKILL.md files compatible with 30+ agents via the agentskills.io standard - including Codex, Cursor, Gemini CLI, and Claude Code.

| Skill | Description | | ------------------------------------------------------------------ | ----------------------------------------------------------------------------------- | | logfire-instrumentation | Add Logfire observability to Python, JS/TS, and Rust apps | | logfire-query | Query and analyze Logfire traces, logs, spans, metrics, and activity data | | logfire-ui | Open Logfire project pages, live views, traces, and Explore filters | | building-pydantic-ai-agents | Build LLM-powered agents with Pydantic AI — tools, capabilities, streaming, testing | | pydantic-ai-harness | Extend Pydantic AI agents with harness capabilities like Code Mode (sandboxed run_code) |