Skill Claude CodeCodex
Implement a feature from a product/tech spec, URL, GitHub issue, or by auto-selecting the next papercut enhancement. Reads the spec, implements the feature following Streamlit patterns, and creates a merge-ready PR. Use when given a spec folder path, document URL, or issue link to implement, or when asked to implement…
Skill Claude CodeCodex
Runs frontend unit tests with coverage, analyzes coverage reports, and implements meaningful tests to increase coverage by 0.2%. Use when you want to systematically improve frontend test coverage with high-value test cases.
Skill Claude CodeCodex
Runs Python unit tests with coverage, analyzes coverage reports, and implements meaningful tests to increase coverage by 0.2%. Use when you want to systematically improve Python test coverage with high-value test cases.
Skill Claude CodeCodex
Evaluates a PR's title and description for readability — do they clearly and concisely convey what changed and why to a reviewer? Produces findings with concrete proposed rewrites; the caller decides whether to apply them or present them as feedback. Use when finalizing a PR or reviewing PR metadata. For code…
Skill Claude CodeCodex
Evaluates comments, docstrings, and naming in code for readability by a developer new to the codebase — is the documentation clear and concise, and is non-obvious logic documented? Produces findings with concrete proposed rewrites (or additions where documentation is missing); the caller decides whether to apply them…
Skill Claude CodeCodex
Uploads agent-generated artifacts (specs, plans, learnings) to the streamlit.wiki for sharing via PR comments. Use when you have agent artifacts to share with reviewers.
Skill Claude CodeCodex
Explains Streamlit's internal architecture including backend runtime, frontend rendering, and WebSocket communication. Use when debugging cross-layer issues, understanding how features work end-to-end, planning architectural changes, or onboarding to the codebase. Covers ForwardMsg/BackMsg protocol, script rerun…
Skill Claude CodeCodex
Review internal documentation (.md files) against the current codebase state and propose updates for outdated or incorrect information.
Skill Claude CodeCodex
Writes product and tech specs for new Streamlit features. Use when designing new API commands, widgets, or significant changes that need team review before implementation.
Cursor rule Cursor
This directory contains custom subagent definitions for Claude Code (and Cursor, which reads from this directory).
Cursor rule Cursor
We use playwright with pytest to e2e test Streamlit library. E2E tests verify the complete Streamlit system (frontend, backend, communication, state, visual appearance) from a user's perspective (black-box). They complement Python/JS unit tests, which are faster and focus on internal logic, input/output validation…
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Skills under lib/streamlit/.agents/skills/ ship with the library and load from the user's installed Streamlit, so keep them current as features evolve. developing-with-streamlit uses SKILL.md for routing and references/ for topic files. Follow these conventions when adding or editing guidance.
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Streamlit is an open-source (Apache 2.0) Python library for creating interactive web applications and dashboards with focus on data apps and internal tools.
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Protobuf messages are used for communication between the Streamlit backend and frontend via WebSocket connections.
Cursor rule Cursor
Cursor rule "python" from streamlit/streamlit, covering python development guide, key principles, docstrings, package structure and dependencies.
Cursor rule Cursor
Tips and guidelines specific to the development of the Streamlit Python library, not applicable to scripts and e2e tests.
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We use the unit tests to cover internal behavior that can work without the web / backend counterpart. We aim for 95%+ unit test coverage of our Python code in lib/streamlit.
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Utility scripts for development and CI/CD.
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This file provides guidance to AI coding agents (Claude Code, Cursor, Copilot, etc.) when working with skills in this repository.
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This directory contains product and tech specs for Streamlit features.
Cursor rule Cursor
Changes to these high-fan-out internals can affect every message, delta, element, or rerun. Keep work in them minimal, and benchmark changes with representative stress-test apps.
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This folder contains all GitHub Actions workflows for the Streamlit repository. Workflows automate CI/CD, testing, releases, and maintenance tasks.
Instructions file GitHub Copilot
Copilot instructions for streamlit/streamlit, covering streamlit repo overview, tech stack, folder structure, shell & build policy and make commands.
Instructions file GitHub Copilot
Instructions for streamlit/streamlit, covering agent definitions, file format, best practices, cross-platform compatibility and slash command support.