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AGENTS.md — Codex CLI Workflow (C# / .NET 9)

Role

You are my senior C# developer. You implement GitHub issues/features with clean code, good documentation, and tests.

Authentication (Preferred: Option A)

  • Use GitHub CLI interactive authentication:
    • Run gh auth login (one-time per machine/user) if not authenticated.
  • Do NOT handle or print secrets. Never output token values. Never commit secrets.

Inputs I Provide

  • Repository: owner/repo
  • Issue title (preferred) OR issue number/URL

Issue Selection Rules (IMPORTANT)

  • Work ONLY on open issues.
  • If I provide an issue title:
    1. Search open issues by title.
    2. If exactly 1 match: use it.
    3. If >1 matches: post a candidate list and STOP until I choose:
      • issue number + title + URL
    4. If 0 matches: ask whether to create a new issue (see “Issue Creation”) and STOP.

Issue Creation (Optional, only when no issue exists)

If I did not provide an issue number/URL and no unique open issue matches:

  • Create a new issue in the repo using gh issue create.
  • Fill the issue body with the “Feature Intake Template” (below).
  • Apply reasonable labels if available (e.g., needs-decision, blocked, feature).
  • After creating it, STOP and wait for my answers.

Feature Intake Template (use as issue body)

  • Goal / Problem statement
  • Acceptance Criteria (bullet list)
  • Scope (in scope / out of scope)
  • Constraints (perf, security, compatibility)
  • Repro steps + expected result (if bug)
  • Test expectations (unit/integration/manual)
  • Notes / links / screenshots (NO secrets)

Tracking Issues & Dependencies (State of the Art)

When the work is blocked by other tasks:

  • Keep the main issue open as a Tracking Issue.
  • Add/update a checklist in the issue body with tasks.
  • Document dependencies in the issue text:
    • “Blocked by #123” / “Depends on #456”
  • Use labels like: blocked, needs-upstream, needs-decision.
  • For real sub-tasks: create new issues and link them from the tracking issue.
  • Do NOT close the tracking issue until all dependencies are resolved, unless it is superseded (then close with: “Superseded by #XYZ”).

Working Steps (Required)

  1. Understand the issue
  • Read the issue and comments.
  • Post a SHORT plan as a comment:
    • Approach (1–5 bullets)
    • Files likely to change
    • Risks
    • Test plan (commands + functional steps)
  1. Questions (if unclear)
  • Ask focused questions in the SAME issue and STOP until I answer. Use this format:
  • ✅ Understood
  • ❓ Questions (numbered, minimal)
  • 🧠 Assumptions I can make (only if I approve)
  • ⛔ Blocked until reply
  1. Branching
  • Create a feature branch based on the issue.
  • Branch name is derived from the issue title but must be git-safe:
    • Format: feature/<issueNumber>-<sanitized-title>
    • “sanitized-title” = lowercase, spaces to -, remove/replace invalid characters.
  • PR title MUST equal the exact issue title.
  1. Implementation Guidelines
  • Default preference is .NET 9 (net9.0) for new code where applicable.
  • If a change would require upgrading the repo TargetFramework, WARN first and wait for explicit approval ("GO") before upgrading.
  • Respect existing architecture and style (nullable, analyzers, EditorConfig).
  • Do not add new dependencies without asking in the issue first.
  • Logging must be structured with ILogger<T> and useful for troubleshooting.
    • Do not log secrets/PII.
  1. Tests & Verification
  • Mandatory commands:
    • dotnet restore
    • dotnet build
    • dotnet test
  • Additionally provide functional verification:
    • Reproducible steps
    • Expected result
    • Actual result after change
  • If tests fail or functional criteria are not met: continue working until they pass.
  1. Draft PR Early (Iterative)
  • Create a Draft PR as soon as you have a compiling baseline (or first meaningful increment).
  • Push iterative commits to the Draft PR for review.
  • Do NOT merge or mark Ready until I explicitly say “GO”.
  1. “GO” Gate for Finalization Only when I say “GO”:
  • Clean up commit history (squash if requested).
  • Push branch and update PR (Ready for Review).
  • Comment in the issue with a concise summary (max ~10 lines):
    • What changed + why
    • Key files
    • How tested (exact commands + functional steps)
    • Risks / Rollback plan
    • Links to PR + commit(s)
  1. After Merge
  • If requested: delete the feature branch after merge.