holocron/plugins/core/skills/provider-adapter-author/SKILL.md

name, description, allowed-tools, metadata

name	description	allowed-tools	metadata
provider-adapter-author	Use when the user wants to convert a provider-specific AI instruction file (CLAUDE.md, .cursor/rules/*.mdc, copilot-instructions.md, etc.) into a thin adapter that defers to a repo's AGENTS.md — e.g. "reduce duplication between CLAUDE.md and AGENTS.md", "make CLAUDE.md just import AGENTS.md" — even if the pattern isn't named explicitly. Also invoke when agentsmd-author detects an existing provider file overlapping with AGENTS.md it just wrote. Detects redundant content in a provider file relative to AGENTS.md and rewrites it down to a minimal reference (an `@AGENTS.md`-style import where supported, or a text pointer otherwise) plus genuinely provider-specific additions. Self-validates via a bundled deterministic script before finishing. Do not use to write or audit AGENTS.md itself — use agentsmd-author or agentsmd-audit.	Bash Read Edit Write	category source_keys version docs adr-0002-0003-two-tier-claude-md 0.1.0

Gotchas

• Not every provider supports cross-file imports. Claude Code does — a CLAUDE.md can consist of nothing but one or more @path lines (e.g. @AGENTS.md), with no other content required. Cursor's .cursor/rules/*.mdc and GitHub Copilot's copilot-instructions.md have no native import mechanism as of current tooling — for those, "thin" means a short text pointer to AGENTS.md plus only what that tool actually needs, not a literal import line. Pass --no-import-syntax to scripts/validate-adapter.sh for these providers.
• This skill never creates or edits AGENTS.md itself. If the target repo has no AGENTS.md yet, stop and point the user to agentsmd-author first — there's nothing to adapt to.
• Only strip content from the provider file that's genuinely redundant with AGENTS.md. Provider-specific material (IDE settings, tool-only syntax, model-specific instructions) stays — the goal is thin, not empty.
• Works standalone or composed-into by agentsmd-author — behave identically either way; don't assume a caller skill exists.

Step 1 — Detect

Look for known provider instruction files in the target repo: CLAUDE.md (repo root, and any deployed copies), .cursor/rules/*.mdc, .github/copilot-instructions.md, and similar tool-specific files. Confirm AGENTS.md exists at the repo root — if not, stop and tell the user to run agentsmd-author first.

Step 2 — Diff and rewrite

Read the provider file and AGENTS.md side by side. Separate the provider file's content into two buckets: lines that restate what AGENTS.md already owns (universal rules, conventions, project overview) versus lines that are genuinely provider-specific (tool syntax, IDE behavior, model-specific instructions). Rewrite the provider file:

• Providers with import syntax (Claude Code): replace the redundant bucket with an @AGENTS.md (or correct relative path) import line, keep the provider-specific bucket below it.
• Providers without import syntax (Cursor, Copilot, etc.): replace the redundant bucket with a short pointer sentence mentioning AGENTS.md, keep the provider-specific bucket.

Step 3 — Self-validate

Run the bundled check before finishing — this is the skill's own closeout gate; there is no separate paired audit skill for this concern:

bash scripts/validate-adapter.sh [--no-import-syntax] [--max-lines N] <adapter-file> <agents-md-file>

Fix any FAIL and re-run until it exits 0.

Step 4 — Report

State which file was converted, what was removed versus kept, and the validator's final result.