AdrMcp: Skill for Claude Code

Superseding a decision

You retire or replace a prior decision correctly — preserving history rather than editing the past. ADRs are immutable records: you don't rewrite an accepted decision, you supersede it with a new one and link them.

Requires the AdrMcp MCP server (tools supersede_adr, set_status, link_adrs, find_related_adrs, get_adr). If unavailable, ask the user to connect it first.

First, pick the right move

• Replaced by a new decision → supersede_adr (create the replacement, mark the old one superseded, link both ways — in one call). This is the common case.
• No longer relevant, nothing replaces it → set_status to deprecated.
• Was never adopted → set_status to rejected (only valid from proposed).
• Just needs a small correction (typo, clarification) → this is NOT superseding; use update_adr on the original instead.

Remember the lifecycle the server enforces: proposed → accepted → {deprecated, superseded}, and proposed → rejected. You can't supersede something that was never accepted.

Workflow (replacement case)

1. Inspect the old decision. get_adr <old-id> and find_related_adrs <old-id> — know what already points at it so nothing is orphaned.
2. Frame the new decision with the same rigor as adr-author: what changed in the forces since the original? The new Context should explain why the old choice no longer holds, not just restate the new one.
3. Preview supersede_adr(oldIdOrSlug, newTitle, context, decision, consequences, …) with previewOnly=true. Confirm the diff shows: new ADR created as accepted with a supersedes link, and the old ADR flipped to superseded with a superseded-by link.
4. Commit by re-calling with previewOnly=false once approved.
5. Re-point stragglers. If other ADRs relates-to the old one and should now track the replacement, add links with link_adrs.

Guardrails

• Never delete or silently rewrite the superseded ADR — its value is the historical trail.
• The new ADR must say what the old one got wrong or what changed; a supersession without a reason is just churn.
• After committing, the supersession chain should read cleanly end-to-end (find_related_adrs on the original should list the replacement in its chain).