Setup Python Tools

Adds client-side Python tool execution to Flows apps via Pyodide. This is the follow-up to integrate-atlas-chat when your agent has Python tools defined in its CDF config. It installs Pyodide 0.29.3, sets up the usePyodideRuntime hook with loading states, and wires pythonRuntime into useAtlasChat. No manual tool configs needed since the library fetches Python code directly from the agent's config. First load is slow (30MB download), but it caches. The skill is opinionated about UI placement: loading indicators go above the input, not in the message list, and the entire input area should be disabled while Python initializes.

skills.sh installs: 1.9K
GitHub stars: 6
last updated: Aug 21, 2026

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Install

$ npx -y skills add cognitedata/builder-skills --skill setup-python-tools --agent claude-code

Installs into .claude/skills of the current project.

Files

Set Up Python Tool Execution

Add client-side Pyodide execution for $ARGUMENTS. Skip this if the app uses the Atlas / EOS sidebar (integrate-fusion-agent).

Prerequisite: src/atlas-agent/ from integrate-atlas-chat, plus @sinclair/typebox. Copy python.ts, pyodide.ts, pyodide-react.ts, pyodide-runtime.ts from integrate-atlas-chat/code/ into src/atlas-agent/.

CDF runPythonCode tools arrive as toolConfirmation + clientTool. Wire usePyodideRuntime and pass pythonRuntime to useAtlasChat — no PythonToolConfig entries. Pyodide is ~30MB, cached after first load.

Step 1 — Understand the app

Read these files before touching anything:

package.json — detect package manager and existing deps
The component that calls useAtlasChat — understand current tools/config

Step 2 — Install Pyodide

Install exactly pyodide@0.29.3 using the app's package manager. This version must match the CDN artifacts loaded at runtime — installing a different version will cause errors.