Extract frontmatter from an MDX file
AI agents call get_mdx_frontmatter to retrieve information from MDX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves structured metadata (YAML/TOML frontmatter) from MDX files without any side effects. It does not modify, delete, execute code, or trigger external operations. The sibling tools (convert_mdx_to_md, read_mdx, search_mdx) are all read-category operations, consistent with this classification.
From the tool's definition Tool name 'get_mdx_frontmatter' and description 'Extract frontmatter from an MDX file' indicate data retrieval with no modification, deletion, or execution. Frontmatter extraction is a read operation on file metadata.
Attacks that exploit this kind of access
Extract frontmatter from an MDX file. It is categorised as a Read tool in the MDX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MDX MCP Server MCP server in PolicyLayer and add a rule for get_mdx_frontmatter: 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 MDX MCP Server. Nothing to install.
get_mdx_frontmatter 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 get_mdx_frontmatter 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 get_mdx_frontmatter. 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.
get_mdx_frontmatter is provided by the MDX MCP Server MCP server (llmtooling/mdx-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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