Compute a structural diff between two JSON values, showing added, removed, and replaced fields.
Part of the Diff Patch Tools server.
Free to start. No card required.
AI agents use json_diff to create or modify resources in Diff Patch Tools. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call json_diff repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Diff Patch Tools.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"json_diff": {
"limits": [
{
"counter": "json_diff_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Diff Patch Tools policy for all 6 tools.
These attack patterns abuse exactly the kind of access json_diff gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Compute a structural diff between two JSON values, showing added, removed, and replaced fields.. It is categorised as a Write tool in the Diff Patch Tools MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Diff Patch Tools MCP server in PolicyLayer and add a rule for json_diff: 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 Diff Patch Tools. Nothing to install.
json_diff is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the json_diff 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 json_diff. 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.
json_diff is provided by the Diff Patch Tools MCP server (https://api.lazy-mac.com/diff-patch-tools/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Diff Patch Tools tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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