Pretty-print a JSON string.
AI agents call format_json to retrieve information from Friday MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads a JSON input and formats it for display purposes. It does not create, modify, delete, or execute any operations—it only transforms the presentation of data. The operation is entirely reversible and has no side effects on underlying data or systems. It poses minimal security risk as misuse would only result in differently formatted output.
From the tool's definition The tool 'format_json' performs a pretty-print operation on a JSON string, which is a read and transformation operation with no data modification, deletion, or execution side effects.
Attacks that exploit this kind of access
Pretty-print a JSON string. It is categorised as a Read tool in the Friday MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Friday MCP Server MCP server in PolicyLayer and add a rule for format_json: 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 Friday MCP Server. Nothing to install.
format_json 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 format_json 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 format_json. 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.
format_json is provided by the Friday MCP Server MCP server (jeremylakeyjr/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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