Structured deep diff of two JSON values. POST { a, b }. Returns a list of changes, each with a dot-path and type (added / removed / changed) plus from/to values, and a total change count. For change-detection, config drift, and review tooling.
AI agents call dev.diff-json to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a comparison and analysis tool with no side effects. It reads two JSON structures and produces a report of their differences. It neither modifies data, executes code, deletes anything, nor moves money. The use cases cited ('change-detection, config drift, and review tooling') all imply passive inspection.
From the tool's definition Tool description states it 'Returns a list of changes' from comparing two JSON inputs with 'dot-path and type (added / removed / changed) plus from/to values'.
Attacks that exploit this kind of access
Structured deep diff of two JSON values. POST { a, b }. Returns a list of changes, each with a dot-path and type (added / removed / changed) plus from/to values, and a total change count. For change-detection, config drift, and review tooling. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for dev.diff-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 Mcp. Nothing to install.
dev.diff-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 dev.diff-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 dev.diff-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.
dev.diff-json is provided by the MCP server (@2sio/mcp). 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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