`Unrecognized named-value: 'matrix'` / `Available expression contexts: github, inputs, vars, needs, strategy, matrix, secrets, steps, job, runner, env`

Reproduce the diagnostic in the .github/workflows/ci.yml example using VS Code 1.98.0 and GitHub Actions extension 0.27.1. Start by tracing validation for job-level outputs that reference matrix; done means the diagnostic accurately reflects whether that context is usable and no longer contradicts the listed available contexts.

Type: Bug

Create a .github/workflows/ci.yml file with:

name: CI
on:
  push:
  workflow_dispatch: 

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-arch:
    name: Build
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write

    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-24.04
            name: amd
          - os: ubuntu-24.04-arm
            name: arm

    runs-on: ${{ matrix.os }}
    outputs:
      attestation-url: ${{ steps.attestation.outputs.attestation-url }}
      ${{ matrix.name }}-attestation-url: ${{ steps.attestation.outputs.attestation-url }}
      my-matrix: ${{ matrix }}
      ${{ toJSON(matrix) }}: 'x'

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build and push Docker image
        id: push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Generate artifact attestation
        id: attestation
        uses: actions/attest-build-provenance@v2
        with:
          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
          subject-digest: ${{ steps.push.outputs.digest }}
          push-to-registry: true

          
  combine-images:
    name: Combine images
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write

    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

See a red-squiggly near ${{ matrix.name }}-attestation-url: ${{ steps.attestation.outputs.attestation-url }}

Hover over ${{ matrix.name }}

See:

Unrecognized named-value: 'matrix'
Available expression contexts: github, inputs, vars, needs, strategy, matrix, secrets, steps, job, runner, env

View problem shows:

Unrecognized named-value: 'matrix'

• If an expression is available, then it should be usable.
• If it isn't available, then it shouldn't be listed as available.

Extension version: 0.27.1
VS Code version: Code 1.98.0 (Universal) (6609ac3d66f4eade5cf376d1cb76f13985724bcb, 2025-03-04T21:06:18.612Z)
OS version: Darwin arm64 24.3.0
Modes:

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dwcopilot:31170013
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dwoutputs:31242946
customenabled:31248079
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copilot_t_ci:31222730
jda6j935:31233686