Read an image or audio file. Returns the base64 encoded data and MIME type. Only works within allowed directories.
AI agents call read_media_file to retrieve information from FilesystemMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and decodes media file contents without modifying, creating, or deleting any data. It is a straightforward read operation with no capability to execute code, cause financial harm, or irreversibly alter data. The base64 encoding is merely a representation format for transmission, not an execute operation. Low severity due to restricted directory access and read-only nature.
From the tool's definition Tool name 'read_media_file' and description 'Read an image or audio file. Returns the base64 encoded data and MIME type' indicates data retrieval with no side effects. Constraint 'Only works within allowed directories' confirms restricted scope.
Attacks that exploit this kind of access
Read an image or audio file. Returns the base64 encoded data and MIME type. Only works within allowed directories. It is categorised as a Read tool in the FilesystemMCP MCP Server, which means it retrieves data without modifying state.
Register the Filesystem MCP server in PolicyLayer and add a rule for read_media_file: 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 FilesystemMCP. Nothing to install.
read_media_file 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 read_media_file 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 read_media_file. 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.
read_media_file is provided by the Filesystem MCP server (rijadalisic/filesystemmcp). 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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