migrate

name	migrate
description	Preview or migrate ADR metadata and body profiles. Use for legacy ADRs, MADR, Nygard, canonical conversion, or migration planning.
argument-hint	[file or directory; defaults to docs/adr/]
disable-model-invocation	true
allowed-tools	["Read","Edit","Glob","Grep"]

adr-kit migrate

Use $ARGUMENTS as the file or directory; default to docs/adr/. Always preview before applying a migration.

You are running /adr-kit:migrate. The user wants to add invariant adr-kit metadata or convert between the supported madr, nygard, and canonical body profiles. This is a write skill: preview first, show the result, obtain confirmation, then apply it.

Start with the shared read-only discovery report:

python bin/adr-migrate --plan <path>

The plan detects MADR, Nygard, canonical, conservative Y-Statement, Tyree/Akerman, and arc42 markers, including recognizable files that do not yet use an ADR-NNN-...md filename. It reports an exact deterministic preview when metadata and filename normalization are safe. Ambiguous, hybrid, and semantically lossy formats are routed to this guided workflow. --plan never writes, and detection never authorizes migration.

Selective-context metadata is a separate, read-only preview:

python bin/adr-migrate --suggest-retrieval --dry-run <path>

It proposes topics, components, symbols, and Decision Contract candidates from existing source facts. It never writes automatically. Review every candidate against the authoritative ADR, obtain explicit human approval, apply only the approved metadata deliberately, rebuild the generated index, and run the project retrieval probes. Do not combine this mode with profile conversion.

Use the deterministic CLI whenever the source is already a supported profile:

python bin/adr-migrate --dry-run --to-profile madr <path>
python bin/adr-migrate --to-profile madr <path>
python bin/adr-migrate --check --to-profile madr <path>

Use --from-profile only to disambiguate an unknown or hybrid record after reading it. The same source and target is an idempotent no-op. Existing frontmatter, Status History, relationships, references, and Enforcement remain unchanged. Use the guided patterns below only for genuinely legacy shapes that cannot be converted by semantic headings alone.

Inputs

• No argument: migrate ADRs in docs/adr/ (the whole tree).
• A directory path: migrate ADRs under that directory.
• A file path: migrate that one file.

If the path does not exist or contains no ADR files, say so plainly and stop.

Cardinal rules

1. Read-then-confirm. Always read every target file before proposing edits. Always show the proposed restructure (file by file, summarised) and ask for explicit confirmation before calling Edit. Silent writes are forbidden.
2. No fabrication. If a target-profile section is missing and the source contains no content that maps to it, do not invent a decision. The deterministic CLI inserts an explicit TODO or None extension; guided migration uses a <!-- TODO: populate --> placeholder.
3. Preserve content. The migration restructures shape, not substance. Bullet points, prose, examples, and links from the source must appear in the target unchanged. Reorder; do not rewrite.
4. Idempotent. Running migration when the record already uses the selected target profile is a no-op.
5. Skip files that opt out. A file with <!-- adr-kit-lint: skip --> is left untouched. A file with <!-- adr-kit-lint: advisory --> gets a warning ("this file is currently in advisory mode; migrating will make the marker meaningless") and a confirmation prompt.

Workflow

Step 1: read the policy

Look for docs/adr/.adr-kit.json (relative to project root, or the directory passed). If template.profile is set, use it as the target unless the user selected another profile. template.required_sections describes a custom shape and requires guided migration. The default target is MADR. Every profile keeps Status, Status History, Related Decisions, References, and Enforcement. The semantic choice headings are:

Profile	Context	Alternatives	Decision
MADR	Context and Problem Statement	Considered Options	Decision Outcome
Nygard	Context	Alternatives Considered	Decision
Canonical	Context	Alternatives Considered	Decision

MADR also requires Decision Drivers. Use the shared registry and selected template as the ordering contract instead of assuming canonical headings.

Step 2: classify each input file

For each file, determine:

• Already on the selected profile (required semantic sections present) -> skip, report as "no changes needed".
• Marker says skip -> skip, report as "skipped per marker".
• Marker says advisory -> ask "advisory marker is on this file; migrate anyway?"
• Migratable -> identify which patterns apply (see next section).

Step 3: identify patterns

The skill body below documents the patterns observed in real-world legacy ADRs. Apply each pattern that fits, in this order. Do not invent new transformations.

Pattern A: inline status promotion

Source:

# ADR-NNN Title

**Status:** Accepted
**Date:** 2026-04-25
**Supersedes:** ADR-XXX (optional)

Target:

# ADR-NNN Title

## Status

Accepted, 2026-04-25. Supersedes ADR-XXX (optional).

If only **Status:** exists with no **Date:**, the Status section reads Accepted (without date).

Pattern B: alternatives inside Context

Source has a ### Alternatives considered: (or ### Alternatives considered and rejected) heading nested inside ## Context. Target: lift the entire block out, change ### to ## , and place the new top-level ## Alternatives Considered heading between ## Decision and ## Consequences. Preserve content verbatim; only the heading level and position change.

Pattern C: alternatives inside Consequences

Same as Pattern B but the source nests alternatives inside ## Consequences. Target: same restructure, place between Decision and Consequences.

Pattern D: Related to Related Decisions + References split

Source: a ## Related section that mixes ADR/TASK references with file paths, PR links, vendor doc URLs, internal docs.

Target: rename to ## Related Decisions. Move pure-external references (files, URLs, PRs that are not ADR or TASK identifiers) to a new ## References section that follows. Keep ADR-NNN and TASK-NNN entries in ## Related Decisions.

Heuristic for splitting:

• Lines starting with ADR-, TASK-, or referencing those identifiers -> ## Related Decisions.
• Lines starting with backticks (file path), URL, or PR /Issue references -> ## References.
• When ambiguous, leave in ## Related Decisions (safer default).

Pattern E: missing References with no inline content

If after Pattern D there are no external references to populate ## References, create the section with a placeholder:

## References

<!-- TODO: populate from inline citations or external sources cited in the body. -->

Never invent references. The placeholder makes it clear to a human reviewer that this is a known gap.

Pattern F: missing Alternatives Considered with no source

If the source legitimately has no alternatives discussion anywhere, create the section with a placeholder:

## Alternatives Considered

<!-- TODO: document at least 2 alternatives that were considered and rejected, with reasoning. -->

This is a real gap a human should fill, but the skill must not fabricate.

Guided Pattern G: unsupported MADR variant

Source is a MADR-shaped ADR (madr.github.io): YAML frontmatter carrying status: / date:, plus ## Context and Problem Statement, ## Considered Options, ## Decision Outcome, and often ## Pros and Cons of the Options and ### Positive Consequences / ### Negative Consequences subsections. Standard MADR records are supported directly and should use bin/adr-migrate --to-profile .... Use this mapping only for an unknown or hybrid MADR variant that the semantic registry cannot convert safely.

Mapping to semantic roles (content moves verbatim; target headings come from the selected profile):

MADR source	Semantic target
frontmatter status: + date: (or inline * Status: lines)	invariant Status; preserve and complete frontmatter
## Context and Problem Statement plus ## Decision Drivers	context and drivers roles
## Considered Options plus ## Pros and Cons of the Options	alternatives role; keep the chosen option marked
## Decision Outcome ("Chosen option: ..., because ...")	decision role
positive/negative consequence subsections or bullets	consequences role
## Links / ## More Information	split per Pattern D: ADR identifiers to ## Related Decisions, external links to ## References

If the source has no Related Decisions or References content, apply Patterns E / F TODO placeholders. Never invent rejection reasons that the Pros and Cons section does not state; if an option has no documented cons, carry it over with <!-- TODO: state why this option was rejected -->.

Guided Pattern H: minimal or unsupported Nygard variant

Source is a Nygard / adr-tools ADR: exactly ## Status, ## Context, ## Decision, ## Consequences, nothing else. Standard Nygard records are a supported source profile. Prefer the deterministic CLI, which preserves those four sections and adds the selected profile's explicit extension placeholders.

The four sections map directly to semantic roles and their content is preserved verbatim. Missing target-profile sections are created with explicit TODO or None placeholders:

• ## Alternatives Considered between Decision and Consequences, via Pattern F's placeholder.
• ## Related Decisions after Consequences, with - None. unless the Status or Context text references other ADRs (e.g. "Supersedes ADR-9"), in which case those references move here.
• ## References last, via Pattern E's placeholder.

Nygard Status sections often contain supersession links ("Superseded by [ADR-12]"). Keep them in ## Status as prose and mirror the ADR identifier into ## Related Decisions.

Step 4: present the plan

Before applying any edit, show the user a per-file summary:

Proposed migration plan (3 files):

ADR-007-timer-based-task-scheduling.md
  Pattern A: inline `**Status:**` -> `## Status` heading
  Pattern D: `## Related` -> `## Related Decisions` + new `## References`

ADR-029-simple-xhr-ota-flash.md
  Pattern A: inline `**Status:**` -> `## Status` heading
  Pattern F: missing `## Alternatives Considered`, will create with TODO placeholder

ADR-058-nonblocking-pic-command-response.md
  Pattern A: inline `**Status:**` -> `## Status` heading
  Pattern F: missing `## Alternatives Considered`, will create with TODO placeholder
  Pattern E: missing `## References`, will create with TODO placeholder
  No `## Related Decisions` content found in source; will create with `- None.`

Confirm to apply (y/n)?

If the user declines, stop without writing.

Step 5: apply edits

After confirmation, apply each transformation via Edit. One Edit per logical change, so the diff is reviewable. Report what was changed per file.

Step 6: post-migration verification

After all edits, suggest the user run /adr-kit:lint <path> to confirm the migrated files now PASS strictly. Do NOT run lint yourself: that is a separate skill the user invokes.

What you do not do

• You do not modify the body content of sections. Headings move; prose stays.
• You do not auto-fabricate Alternatives Considered or References content. Use TODO placeholders.
• You do not rename ADR files (Consistency-gate filename FAILs). Out of scope.
• You do not edit ADRs that already PASS strict.
• You do not invoke /adr-kit:lint after migration. The user decides when to verify.

Reporting format

Single-file migration:

ADR-007-timer-based-task-scheduling.md migrated.
  Applied: Pattern A (Status promotion), Pattern D (Related split).
  Run /adr-kit:lint on this file to verify.

Directory migration:

Migrated 3 of 80 candidate files. 1 already on the target profile (skipped). 76 deferred (no patterns matched, manual review needed).

Applied:
  ADR-007 (A, D)
  ADR-029 (A, F)
  ADR-058 (A, F, E, no Related content)

Skipped:
  ADR-022 (already on the target profile)

Deferred (manual review): 76 files.
  Reason: complex shape that did not match any of patterns A through H. Inspect by hand.

Run /adr-kit:lint docs/adr/ to confirm overall result.

The aggregate's bottom line tells the user one concrete next step (run lint), never invents a status the migration did not actually achieve.

Edge cases

• Multiple inline metadata lines: source has **Status:**, **Date:**, **Supersedes:**, **Amended by:**, etc. Fold all into the new ## Status section as a comma-separated sentence. Order: Status, date, supersedes/amended.
• Empty Related section: source has ## Related with no body or only whitespace. Target: ## Related Decisions with - None. body.
• Anchor comments inline at top: source has a Renumbered from ADR-XXX ... line before **Date:**. Fold into the new ## Status section as a trailing sentence: "Renumbered from ADR-XXX on YYYY-MM-DD to resolve duplicate numbering. Content unchanged."
• Body has Markdown that confuses heading-detection: e.g. a ## inside a fenced code block. The skill treats only headings outside code fences as semantic sections. If unsure, ask the user.
• Source uses ## Pros and Cons or ## Decision drivers: if the file matches the MADR shape, Pattern G consumes these (## Pros and Cons of the Options feeds ## Alternatives Considered, ## Decision Drivers folds into ## Context). Otherwise do not rename these; they are project-specific and the user can address custom subsections in a follow-up pass.

Anti-patterns to refuse

If the migration would require any of these, refuse and explain:

• Renaming ADR files. Out of scope; surfaces commit / cross-ref breakage.
• Modifying body prose ("the Decision section reads better if reorganised..."). Restructure shape only.
• Fabricating Alternatives or References. TODO placeholder is the answer.
• Skipping the user confirmation. Read-then-confirm is non-negotiable.
• Running /adr-kit:lint automatically after migration. The user decides.