MCP-Server
SKILL.md Lint
com.moltlinestudio/skillmd-lint
Was dieses MCP kann
Lints SKILL.md files and marketplace package layouts, and provides utilities for cron explanations, JSON validation, text diffs, and regex testing.
Funktionen
Tools
6
Tools
cron_explain
Cron Explain
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.
Nur Lesen
Idempotent
Eingabeschema
{'type': 'object', 'required': ['expression'], 'properties': {'expression': {'type': 'string', 'minLength': 1, 'description': '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.'}}, 'additionalProperties': False}
Ausgabeschema
{'type': 'object', 'additionalProperties': True}
diff_texts
Diff Texts
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.
Nur Lesen
Idempotent
Eingabeschema
{'type': 'object', 'required': ['a', 'b'], 'properties': {'a': {'type': 'string', 'maxLength': 500000, 'description': 'The original text (left side of the diff); at most 500000 characters.'}, 'b': {'type': 'string', 'maxLength': 500000, 'description': 'The revised text (right side of the diff); at most 500000 characters.'}}, 'additionalProperties': False}
Ausgabeschema
{'type': 'object', 'additionalProperties': True}
json_validate
Json Validate
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.
Nur Lesen
Idempotent
Eingabeschema
{'type': 'object', 'required': ['text'], 'properties': {'text': {'type': 'string', 'minLength': 1, 'description': 'The JSON document to validate, as a raw string; must be non-empty.'}}, 'additionalProperties': False}
Ausgabeschema
{'type': 'object', 'additionalProperties': True}
lint_skill
Lint Skill
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.
Nur Lesen
Idempotent
Eingabeschema
{'type': 'object', 'required': ['content'], 'properties': {'content': {'type': 'string', 'minLength': 1, 'description': 'The complete SKILL.md file text, frontmatter included; must be non-empty.'}}, 'additionalProperties': False}
Ausgabeschema
{'type': 'object', 'additionalProperties': True}
packaging_check
Packaging Check
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.
Nur Lesen
Idempotent
Eingabeschema
{'type': 'object', 'required': ['file_paths'], 'properties': {'file_paths': {'type': 'array', 'items': {'type': 'string'}, 'minItems': 1, 'description': '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': {'type': 'string', 'default': 'agensi', 'description': 'Rule set to apply: "agensi" (SKILL.md at root or one folder deep) or "generic" (junk-file checks only). Default "agensi".'}}, 'additionalProperties': False}
Ausgabeschema
{'type': 'object', 'additionalProperties': True}
regex_test
Regex Test
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.
Nur Lesen
Idempotent
Eingabeschema
{'type': 'object', 'required': ['pattern', 'samples'], 'properties': {'pattern': {'type': 'string', 'maxLength': 1000, 'description': 'A Python-flavor regular expression as a string, e.g. "v(\\\\d+)".'}, 'samples': {'type': 'array', 'items': {'type': 'string'}, 'maxItems': 50, 'description': 'Strings to test the pattern against; only the first 50 are evaluated.'}}, 'additionalProperties': False}
Ausgabeschema
{'type': 'object', 'additionalProperties': True}
Verlauf
Letzte Tool-Änderungen
Hinzugefügt
cron_explain
17. September 2026 12:36
Hinzugefügt
diff_texts
17. September 2026 12:36
Hinzugefügt
json_validate
17. September 2026 12:36
Hinzugefügt
regex_test
17. September 2026 12:36
Hinzugefügt
packaging_check
17. September 2026 12:36
Hinzugefügt
lint_skill
17. September 2026 12:36
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