SKILL.md Lint

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Lint a SKILL.md for frontmatter, structure, secrets and size. All 6 tools free.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "SKILL.md Lint": {
      "url": "https://mcp.moltlinestudio.com/skillmd-lint",
      "transport": "streamable-http"
    }
  }
}

Measured tools (6)

• lint_skill read-only

  Lint one SKILL.md file the way marketplaces and agents parse it. FREE. Checks YAML frontmatter presence and required fields (name, description), description quality, body structure (procedure steps, rules, degradation), secret/credential leakage, injection-style phrasing, and size budget. Typical input {"content": "<full SKILL.md text>"} returns {"verdict": "pass" | "pass-with-warnings" | "fail", "errors": ["..."], "warnings": ["..."], "stats": {"body_words": N, "has_frontmatter": bool}}. Use on the full text of one SKILL.md. Not for the surrounding archive layout (packaging_check). Errors: on invalid, missing, or malformed input this tool never raises a protocol error; it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "content is empty: pass the full SKILL.md text including frontmatter"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

  Parameters:

  • content (required) — string — The complete SKILL.md file text, frontmatter included; must be non-empty.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• packaging_check read-only

  Validate a zip layout plan for a skill marketplace before packaging. FREE. Checks SKILL.md placement rules and flags junk files. Typical input {"file_paths": ["my-skill/SKILL.md", "my-skill/examples.md"], "marketplace": "agensi"} returns {"verdict": "pass" | "fail", "issues": ["..."], "skill_files_found": ["my-skill/SKILL.md"]}. Use on a planned file layout, before zipping. Not for the content of a skill file (lint_skill). Errors: on invalid, missing, or malformed input this tool never raises a protocol error; it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "file_paths is empty: list every file that will be inside the zip"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

  Parameters:

  • file_paths (required) — array — Every file path that will be inside the zip, relative to the zip root, e.g. ["my-skill/SKILL.md"]; at least 1 entry.
  • marketplace — string — Rule set to apply: "agensi" (SKILL.md at root or one folder deep) or "generic" (junk-file checks only). Default "agensi".

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• regex_test read-only

  Test a regular expression against sample strings. FREE. Typical input {"pattern": "v(\\d+)", "samples": ["v12", "beta"]} returns {"pattern": ..., "results": [{"sample": "v12", "match": true, "matched_text": "v12", "groups": ["12"]}, {"sample": "beta", "match": false, ...}], "match_count": 1}. Use to confirm a pattern matches what you expect before shipping it. Not for validating JSON (json_validate). The pattern is compiled and run in a short-lived, CPU-capped child process, so a pattern that backtracks catastrophically is stopped instead of stalling the server. Errors: on invalid, missing, or malformed input this tool never raises a protocol error; it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "a sample is too long (max 10000 characters); shorten it and retry"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

  Parameters:

  • pattern (required) — string — A Python-flavor regular expression as a string, e.g. "v(\\d+)".
  • samples (required) — array — Strings to test the pattern against; only the first 50 are evaluated.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• json_validate read-only

  Validate JSON text and summarize its structure. FREE. Typical input {"text": "{\"a\": [1, 2]}"} returns {"valid": true, "structure": {"a": ["array[2]", "int"]}}; invalid JSON returns {"valid": false, "error": "<parser message>", "line": N, "column": N} instead. Use when JSON may be malformed or its shape is unknown. Reports structure, not conformance to a schema. Not for testing a pattern (regex_test). Errors: on invalid, missing, or malformed input this tool never raises a protocol error; it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "text is empty: pass the JSON document as a raw string"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

  Parameters:

  • text (required) — string — The JSON document to validate, as a raw string; must be non-empty.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• diff_texts read-only

  Produce a unified diff between two texts. FREE. Useful for comparing two SKILL.md versions. Typical input {"a": "<old text>", "b": "<new text>"} returns {"changed_lines": N, "diff": "--- \n+++ \n@@ ... @@\n-old line\n+new line"}; identical inputs return {"changed_lines": 0, "diff": "(identical)"}. The diff is capped at 400 lines. Use to show exactly what changed between two versions of a text. Not for judging the risk of a code change - the codereview server's review_diff does that. Errors: on invalid, missing, or malformed input this tool never raises a protocol error; it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "each text must be at most 500000 characters"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

  Parameters:

  • a (required) — string — The original text (left side of the diff); at most 500000 characters.
  • b (required) — string — The revised text (right side of the diff); at most 500000 characters.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• cron_explain read-only

  Explain a 5-field cron expression in plain English and flag mistakes. FREE. Typical input {"expression": "0 9 * * 1-5"} returns {"expression": "0 9 * * 1-5", "meaning": "at minute 0; at hour 9; every day of month; every month; day of week 1-5", "issues": ["none"]}; out-of-range fields are listed in "issues". Use to read a schedule back in plain English before trusting it. Assumes 5-field cron; not for 6-field or seconds-precision variants. Errors: on invalid, missing, or malformed input this tool never raises a protocol error; it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "expected 5 fields, got <value>"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.

  Parameters:

  • expression (required) — string — A standard 5-field cron string (minute hour day-of-month month day-of-week), e.g. "0 9 * * 1-5"; must be non-empty.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

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