Lint Markdown and report issues. Returns a JSON array of lint issues found in the document, each with line number, column, severity (error/warning/info), rule name, message, and fixable flag. Checks for: missing heading spaces, trailing whitespace, inconsistent list markers, hard tabs, multiple b...
Part of the Markdown server.
Free to start. No card required.
AI agents call lint_markdown to retrieve information from Markdown without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though lint_markdown only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"lint_markdown": {}
}
}See the full Markdown policy for all 34 tools.
These attack patterns abuse exactly the kind of access lint_markdown gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Lint Markdown and report issues. Returns a JSON array of lint issues found in the document, each with line number, column, severity (error/warning/info), rule name, message, and fixable flag. Checks for: missing heading spaces, trailing whitespace, inconsistent list markers, hard tabs, multiple blank lines, bare URLs, unclosed emphasis, and unclosed code fences.. It is categorised as a Read tool in the Markdown MCP Server, which means it retrieves data without modifying state.
Register the Markdown MCP server in PolicyLayer and add a rule for lint_markdown: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Markdown. Nothing to install.
lint_markdown is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the lint_markdown rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for lint_markdown. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
lint_markdown is provided by the Markdown MCP server (@xjtlumedia/markdown-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 34 Markdown tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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