# GitNexus skill evolution: runs the offline propose → benchmark → gate loop
# (eval/workflow_bench/evolve.py) on a schedule and, when the deterministic
# promotion gate passes, opens a human-reviewed PR with the promoted skill
# overlay. The gate is evidence FOR a PR, never a bypass of one — nothing
# merges without review.
#
# Activation checklist (the scheduled lane is OFF by default).
# [ ] Configure the repository secret GITNEXUS_BENCH_AUTH_TOKEN (an Anthropic
#     API key — benchmark sessions bill real usage; the Claude Code OAuth
#     subscription token does not work here).
# [ ] Configure the RELEASE_APP_ID and RELEASE_APP_PRIVATE_KEY secrets (the
#     App that opens the promotion PR). The Mint-App-Token step hard-fails
#     without them once a promotion is detected. Verify the App installation
#     is scoped to this repo with only Contents: RW + Pull requests: RW.
# [x] Create the protected Environment `gitnexus-evolution` with a
#     deployment-branch rule restricting it to `main`, and ideally scope the
#     three secrets above to that Environment. workflow_dispatch runs this
#     workflow (and eval/workflow_bench/evolve.py) from the *dispatched ref*,
#     so this server-side rule — not a code-side guard the branch could edit
#     away — is what stops a non-main branch from running with the secrets.
# [x] Register a self-hosted runner labeled `gitnexus-evolution` (a dedicated
#     EC2 box works well). GitHub-hosted runners hard-cap job execution at 6
#     hours, non-configurable — too short once a benchmark session actually
#     invokes Skill/MCP tools for real. Self-hosted runners cap at 5 days
#     instead. This job only ever runs on schedule/workflow_dispatch, never
#     on fork-PR content, so the usual public-repo self-hosted-runner risk
#     doesn't apply — still keep the box dedicated to this workflow, with
#     outbound-only network access, and prefer on-demand over Spot (a Spot
#     reclaim mid-run loses the same way a 6-hour timeout does). Instance,
#     security group, and IAM setup are documented privately, not in this
#     repo — publishing the exact topology of a real, live AWS account
#     isn't safe to do in a public repo even without literal secrets.
#     Accepted tradeoff: the box is stopped between runs (an EventBridge
#     schedule starts it ~15min before the Saturday cron and stops it 24h
#     later) but is not destroyed/recreated per run, so it isn't fully
#     ephemeral — a compromise between the review-flagged ideal (re-image
#     between runs, bounding how long the injected model API key could
#     matter if the box were ever compromised some other way) and the added
#     complexity of per-job ephemeral provisioning for a job that runs at
#     most weekly. Revisit if run frequency increases or the threat model
#     changes; stopping already bounds the exposure window to the job's own
#     runtime on 1 day out of 7.
# [ ] Run workflow_dispatch once and confirm: containment preflight passes,
#     the benchmark completes inside the job timeout, the results artifact
#     uploads, and a promotion (if any) opens a well-formed PR.
# [ ] Set the repository variable GITNEXUS_EVOLUTION_ENABLED=true.
# Roll back by setting that variable to false. Note: workflow_dispatch always
# runs the full benchmark loop regardless of GITNEXUS_EVOLUTION_ENABLED and
# bills real API usage on GITNEXUS_BENCH_AUTH_TOKEN.
name: GitNexus skill evolution

on:
  schedule:
    # Weekly is a deliberate cadence to catch model/harness drift promptly; a
    # no-promotion week only costs one benchmark run (the gate keeps the
    # incumbent unless quality improves). Dial back toward the README's ~90-day
    # re-evaluation guidance if the recurring spend is not worth it.
    - cron: '0 3 * * 6' # weekly, Saturday 03:00 UTC
  workflow_dispatch:
    inputs:
      generations:
        description: 'Propose→bench→gate generations to run'
        required: false
        default: '1'
        type: string
      runs:
        description: 'Runs per arm per task (the gate needs at least 3)'
        required: false
        default: '3'
        type: string
      model:
        description: 'Model for the benchmark arms (match the model your skill users run)'
        required: false
        default: 'claude-sonnet-5'
        type: string
      proposer_model:
        description: 'Model for the proposer/diagnosis session — a stronger model is fine (one session per generation)'
        required: false
        default: 'claude-opus-4-8'
        type: string
      include_expensive:
        description: 'Include tasks marked expensive: true'
        required: false
        default: false
        type: boolean

concurrency:
  group: ${{ github.workflow }}
  cancel-in-progress: false

permissions: {}

jobs:
  evolve:
    name: Propose, benchmark, and gate skill candidates
    if: >-
      github.repository == 'abhigyanpatwari/GitNexus' &&
      (
        github.event_name == 'workflow_dispatch' ||
        vars.GITNEXUS_EVOLUTION_ENABLED == 'true'
      )
    runs-on: [self-hosted, linux, x64, gitnexus-evolution]
    # Gate promotion runs on a protected Environment. An admin must attach a
    # deployment-branch rule (main only) and ideally scope the three secrets to
    # it — server-side enforcement a dispatched non-main ref cannot bypass by
    # editing its own workflow copy. See the activation checklist above.
    environment: gitnexus-evolution
    timeout-minutes: 1440 # self-hosted ceiling is 5 days (7200min); 24h is a generous margin over a single-generation serial run
    permissions:
      contents: read # The promotion PR uses a short-lived App token minted below.
    env:
      GENERATIONS: ${{ inputs.generations || '1' }}
      RUNS: ${{ inputs.runs || '3' }}
      MODEL: ${{ inputs.model || 'claude-sonnet-5' }}
      PROPOSER_MODEL: ${{ inputs.proposer_model || 'claude-opus-4-8' }}
      INCLUDE_EXPENSIVE: ${{ inputs.include_expensive && '1' || '' }}
    steps:
      - name: Require the benchmark auth secret
        env:
          HAS_TOKEN: ${{ secrets.GITNEXUS_BENCH_AUTH_TOKEN != '' }}
        run: |
          set -euo pipefail
          if [[ "${HAS_TOKEN}" != 'true' ]]; then
            echo '::error::GITNEXUS_BENCH_AUTH_TOKEN is not configured. The evolution loop runs real benchmark sessions and needs an Anthropic API key (not the Claude Code OAuth token).'
            exit 1
          fi

      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
          fetch-depth: 0

      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
        with:
          node-version: '22.18.0'
          cache: npm
          cache-dependency-path: |
            gitnexus/package-lock.json
            gitnexus-shared/package-lock.json

      - uses: astral-sh/setup-uv@11f9893b081a58869d3b5fccaea48c9e9e46f990 # v8.3.2
        with:
          version: '0.11.23'
          python-version: '3.13'
          enable-cache: true
          cache-dependency-glob: eval/uv.lock

      - name: Install sandbox runtime and pinned Claude CLI
        run: |
          set -euo pipefail
          sudo apt-get update
          sudo apt-get install --yes --no-install-recommends bubblewrap socat
          apparmor_userns=/proc/sys/kernel/apparmor_restrict_unprivileged_userns
          if [[ -r "${apparmor_userns}" ]] && [[ "$(<"${apparmor_userns}")" == '1' ]]; then
            sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
          fi
          canary_runtime="${RUNNER_TEMP}/claude-canary"
          install -d -m 0700 "${canary_runtime}"
          install -m 0600 \
            .github/claude-canary-runtime/package.json \
            "${canary_runtime}/package.json"
          install -m 0600 \
            .github/claude-canary-runtime/package-lock.json \
            "${canary_runtime}/package-lock.json"
          npm ci \
            --prefix "${canary_runtime}" \
            --ignore-scripts=false \
            --audit=false \
            --fund=false
          node -e \
            "const p=require(process.argv[1]); if(p.version!=='2.1.214') process.exit(1)" \
            "${canary_runtime}/node_modules/@anthropic-ai/claude-code/package.json"
          test "$("${canary_runtime}/node_modules/@anthropic-ai/claude-code-linux-x64/claude" --version)" = \
            '2.1.214 (Claude Code)'

      - name: Install monorepo root dependencies
        run: |
          set -euo pipefail
          # The benchmark's task bindings sandbox-copy node_modules from the
          # monorepo root as well as gitnexus-shared and gitnexus (see the
          # sandbox_copy entries in tasks.scenarios.yaml). The two steps below
          # install the subpackage trees; the root tree needs its own install
          # or capture_task_dependency_binding aborts at task binding on the
          # missing root node_modules.
          npm ci

      - name: Build pinned shared runtime
        run: |
          set -euo pipefail
          npm ci
          npm run build
        working-directory: gitnexus-shared

      - name: Install and build pinned GitNexus runtime
        run: |
          set -euo pipefail
          npm ci
          npm run build
        working-directory: gitnexus

      - name: Point the benchmark task repo at the checkout
        run: |
          set -euo pipefail
          # tasks.scenarios.yaml addresses the target repo as ~/GitNexus (the
          # developer-local convention). On the runner the repo is the checkout
          # at ${GITHUB_WORKSPACE}; link it so runner_tasks.py can resolve the
          # task `repo` path. The benchmark only clones the repo (copy-on-write)
          # and mounts dependencies read-only, so the checkout is never mutated.
          ln -sfn "${GITHUB_WORKSPACE}" "${HOME}/GitNexus"

      - name: Run the propose → benchmark → gate loop
        id: loop
        env:
          GITNEXUS_BENCH_AUTH_TOKEN: ${{ secrets.GITNEXUS_BENCH_AUTH_TOKEN }}
        run: |
          set -euo pipefail
          out_root="${RUNNER_TEMP}/wfevolve"
          echo "out_root=${out_root}" >> "${GITHUB_OUTPUT}"
          extra=()
          if [[ -n "${INCLUDE_EXPENSIVE}" ]]; then
            extra+=(--include-expensive)
          fi
          uv run --locked --extra dev python -m workflow_bench.evolve \
            --tasks workflow_bench/tasks.scenarios.yaml \
            --model "${MODEL}" \
            --proposer-model "${PROPOSER_MODEL}" \
            --generations "${GENERATIONS}" \
            --runs "${RUNS}" \
            --claude-bin "${RUNNER_TEMP}/claude-canary/node_modules/@anthropic-ai/claude-code-linux-x64/claude" \
            --out-root "${out_root}" \
            --apply \
            "${extra[@]}"
        working-directory: eval

      - name: Upload benchmark evidence
        if: always() && steps.loop.outputs.out_root != ''
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: gitnexus-evolution-${{ github.run_id }}-${{ github.run_attempt }}
          path: ${{ steps.loop.outputs.out_root }}
          retention-days: 14
          if-no-files-found: warn

      - name: Detect and bound the applied promotion
        id: promotion
        env:
          OUT_ROOT: ${{ steps.loop.outputs.out_root }}
        run: |
          set -euo pipefail
          changed="$(git status --porcelain)"
          if [[ -z "${changed}" ]]; then
            echo 'No promotion this run; the incumbent skills stand.'
            echo "promoted=false" >> "${GITHUB_OUTPUT}"
            exit 0
          fi
          # The apply step may only touch the canonical skill tree and its
          # shipped mirrors. Anything else means the overlay escaped its
          # boundary — refuse to open a PR from it.
          while IFS= read -r line; do
            path="${line:3}"
            case "${path}" in
              .claude/skills/*|gitnexus/skills/*|gitnexus-claude-plugin/skills/*) ;;
              *)
                echo "::error::Promotion touched a path outside the skill trees: ${path}"
                exit 1
                ;;
            esac
          done <<< "${changed}"
          echo "promoted=true" >> "${GITHUB_OUTPUT}"
          # The loop returns on the first promotion, so the highest-numbered
          # gen-N/bench/promotion.json is the decision that actually fired.
          # Emit only that one — never every generation's, or a rejected
          # generation's decisions could surface in the PR body. The heredoc
          # uses a per-run random delimiter so a summary value that ever
          # contains the marker cannot close the block early and inject keys.
          promotion_file="$(find "${OUT_ROOT}" -name promotion.json | sort -V | tail -1)"
          delim="PROMOTION_EOF_$(openssl rand -hex 16)"
          {
            echo "summary<<${delim}"
            if [[ -n "${promotion_file}" ]]; then
              tail -c 8000 "${promotion_file}"
            fi
            echo
            echo "${delim}"
          } >> "${GITHUB_OUTPUT}"

      - name: Mint GitHub App token
        id: app-token
        if: steps.promotion.outputs.promoted == 'true'
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
        with:
          # `client-id` supersedes the deprecated `app-id` in v3.x (the action
          # accepts the numeric App ID here, as publish.yml does). Request only
          # the permissions this job needs — push a branch and open a PR — so
          # the minted token drops the installation's other grants (e.g.
          # Workflows: write).
          client-id: ${{ secrets.RELEASE_APP_ID }}
          private-key: ${{ secrets.RELEASE_APP_PRIVATE_KEY }}
          permission-contents: write
          permission-pull-requests: write

      - name: Open the promotion PR
        if: steps.promotion.outputs.promoted == 'true'
        env:
          APP_TOKEN: ${{ steps.app-token.outputs.token }}
          GH_TOKEN: ${{ steps.app-token.outputs.token }}
          PROMOTION_SUMMARY: ${{ steps.promotion.outputs.summary }}
          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
        run: |
          set -euo pipefail
          # Include the run attempt: GITHUB_RUN_ID is stable across re-runs, so
          # a re-run after a push-succeeds/PR-create-fails partial failure needs
          # a fresh branch to push (a non-force push to the existing branch
          # would be rejected non-fast-forward and wedge the lane).
          branch="evolution/skills-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}"
          git config user.name 'gitnexus-evolution[bot]'
          git config user.email 'gitnexus-evolution[bot]@users.noreply.github.com'
          git checkout -b "${branch}"
          git add .claude/skills gitnexus/skills gitnexus-claude-plugin/skills
          git commit -m 'feat(skills): promoted evolution overlay (gate-passed)'

          # The App token reaches git through GIT_ASKPASS reading step env at
          # push time — it never appears in argv, git config, or the checkout.
          askpass="${RUNNER_TEMP}/evolution-askpass"
          cat > "${askpass}" <<'ASKPASS_EOF'
          #!/usr/bin/env bash
          printf '%s\n' "${APP_TOKEN}"
          ASKPASS_EOF
          chmod 0700 "${askpass}"
          GIT_ASKPASS="${askpass}" GIT_TERMINAL_PROMPT=0 git push \
            "https://x-access-token@github.com/${GITHUB_REPOSITORY}.git" \
            "HEAD:refs/heads/${branch}"

          {
            cat <<'BODY_HEAD'
          Automated skill-evolution promotion. The deterministic gate passed; this PR is the human-review step — inspect the diff and the evidence before merging.
          BODY_HEAD
            printf '\n%s\n\n' "Benchmark evidence: ${RUN_URL} (artifact gitnexus-evolution-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT})."
            cat <<'BODY_OPEN'
          <details><summary>Promotion decisions</summary>

          ```json
          BODY_OPEN
            printf '%s\n' "${PROMOTION_SUMMARY}"
            cat <<'BODY_CLOSE'
          ```

          </details>
          BODY_CLOSE
          } > "${RUNNER_TEMP}/pr-body.md"
          gh pr create \
            --repo "${GITHUB_REPOSITORY}" \
            --base main \
            --head "${branch}" \
            --title 'feat(skills): promoted evolution overlay' \
            --body-file "${RUNNER_TEMP}/pr-body.md"