# microsoft/pyright

Static Type Checker for Python

Repository: https://github.com/microsoft/pyright
Canonical: https://ross.abutalabs.com/products/pyright
Language: Python
License: NOASSERTION
License Family: other
Last push: 2026-08-27T00:10:47+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 97, longevity 100
- inputs: {"age_days": 2731, "days_push": 7, "days_rel": 21, "gap_med": 14, "n_releases_24m": 34}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 15597, forks 1804 (observed 2026-08-28T04:11:12.685476+00:00)

## What it is
Pyright is a full-featured, standards-based static type checker for Python built by Microsoft, designed for high performance on large codebases. It ships as both a command-line tool and a Visual Studio Code extension.

## Use cases
- check python code for type errors
- static type checking for a large python codebase
- catch type mistakes in CI before merging
- get type checking in vscode
- validate type annotations in python project
- run type checker from command line

## When to choose
- you need fast, standards-compliant type checking for Python
- you want a VS Code integrated type checker
- your codebase is large and checking speed matters
- you want to enforce type hints in CI pipelines

## When to avoid
- you need runtime type validation rather than static analysis
- you prefer mypy's plugin ecosystem or mypy-specific features
- your project does not use type annotations at all

## Facets
- artifact type: cli-tool
- maturity: active
- function: type-system, linter, developer-tools, cli
- domain: developer-tools, programming-languages, testing
- platform: python, cross-platform, cli, editor-plugin
- tags: static-analysis, type-checking, python, vscode-extension, microsoft, editor-plugin, nodejs

## Member repositories
- microsoft/pyright (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:12.685476+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:05:37.963129+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/pyright (fetched 2026-08-28T04:11:12.685476+00:00, sha 06cb74201a37)
- Data as of 2026-08-30T08:39:29.467469+00:00.