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CI workflow (langchain-ai/memory-template)

The CI workflow from langchain-ai/memory-template, explained and optimized by Latchkey.

C

CI health: C - fair

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Source: langchain-ai/memory-template.github/workflows/unit-tests.ymlLicense MITView source

What it does

This is the CI workflow from the langchain-ai/memory-template repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)
# This workflow will run unit tests for the current project

name: CI

on:
  push:
    branches: ["main"]
  pull_request:
  workflow_dispatch: # Allows triggering the workflow manually in GitHub UI

permissions:
  contents: read

# If another push to the same PR or branch happens while this workflow is still running,
# cancel the earlier run in favor of the next run.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  unit-tests:
    name: Unit Tests
    strategy:
      matrix:
        os: [ubuntu-latest]
        python-version: ["3.11", "3.12"]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install dependencies
        run: |
          curl -LsSf https://astral.sh/uv/install.sh | sh
          uv venv
          uv pip install -r pyproject.toml
      - name: Lint with ruff
        run: |
          uv pip install ruff
          uv run ruff check .
      - name: Lint with mypy
        run: |
          uv pip install mypy
          uv run mypy --strict src/
      - name: Check README spelling
        uses: codespell-project/actions-codespell@v2
        with:
          ignore_words_file: .codespellignore
          path: README.md
      - name: Check code spelling
        uses: codespell-project/actions-codespell@v2
        with:
          ignore_words_file: .codespellignore
          path: src/
      - name: Run tests with pytest
        run: |
          uv pip install pytest
          uv run pytest tests/unit_tests

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

# This workflow will run unit tests for the current project
 
name: CI
 
on:
  push:
    branches: ["main"]
  pull_request:
  workflow_dispatch: # Allows triggering the workflow manually in GitHub UI
 
permissions:
  contents: read
 
# If another push to the same PR or branch happens while this workflow is still running,
# cancel the earlier run in favor of the next run.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  unit-tests:
    timeout-minutes: 30
    name: Unit Tests
    strategy:
      matrix:
        os: [ubuntu-latest]
        python-version: ["3.11", "3.12"]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v4
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Install dependencies
        run: |
          curl -LsSf https://astral.sh/uv/install.sh | sh
          uv venv
          uv pip install -r pyproject.toml
      - name: Lint with ruff
        run: |
          uv pip install ruff
          uv run ruff check .
      - name: Lint with mypy
        run: |
          uv pip install mypy
          uv run mypy --strict src/
      - name: Check README spelling
        uses: codespell-project/actions-codespell@v2
        with:
          ignore_words_file: .codespellignore
          path: README.md
      - name: Check code spelling
        uses: codespell-project/actions-codespell@v2
        with:
          ignore_words_file: .codespellignore
          path: src/
      - name: Run tests with pytest
        run: |
          uv pip install pytest
          uv run pytest tests/unit_tests
 

What changed

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

This workflow runs 1 job (2 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow