Compare a file between two SDK versions (git refs). Useful when migrating between SDK versions to see what changed in a sample, config, or API header. Returns a unified diff. Both refs can be branches, tags, or commit SHAs. Example: compare a sample
AI agents call nrf_diff to retrieve information from Nrf without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
nrf_diff is a comparison utility that fetches and displays file differences across git refs (branches, tags, commits). It has no side effects—it neither modifies data, executes code, deletes resources, nor moves funds. The operation is purely informational (Read category). Severity is low because misuse only exposes existing documentation and code diffs already in the repository, with minimal blast radius.
From the tool's definition The tool 'compare a file between two SDK versions' and 'Returns a unified diff' shows it retrieves and displays differences between versions without modifying, deleting, or executing anything.
Attacks that exploit this kind of access
Compare a file between two SDK versions (git refs). Useful when migrating between SDK versions to see what changed in a sample, config, or API header. Returns a unified diff. Both refs can be branches, tags, or commit SHAs. Example: compare a sample. It is categorised as a Read tool in the Nrf MCP Server, which means it retrieves data without modifying state.
Register the Nrf MCP server in PolicyLayer and add a rule for nrf_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 Nrf. Nothing to install.
nrf_diff 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 nrf_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 nrf_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.
nrf_diff is provided by the Nrf MCP server (pshanesmith/nrf-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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