Add Git Tag Workflow

Use this workflow whenever the user wants to mark a milestone in the current Git repository with a tag. The agent may use a read-only sidecar to draft milestone content from git history, but the main agent must keep the human gates before creating or pushing a tag.

Execution Contract

• Default runner: main agent.
• Sidecar eligible: yes, for read-only milestone proposal generation.
• Suggested sidecar model: gpt-5.3-codex-spark through codex exec --ephemeral.
• Sidecar permissions: read-only.
• Human gates: before git tag -a; before git push origin <tag>.
• Final actions: only the main agent creates and pushes tags.
• Required artifacts when using a sidecar: .agent/sidecars/<task-id>/prompt.md, output.md, model.json, and decision.md.

Step 1 — Gather or Propose Milestone Information

If the user already supplied all three items, use them directly: