Return the Upgrade Helper diff for one changed file.
AI agents call get_file_diff to retrieve information from Rn Upgrade Helper without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool fetches and returns diff information from react-native-community/rn-diff-purge. It performs a read-only query operation with no side effects, no code execution, and no data modification. The tool retrieves existing diffs to help users understand upgrade changes, making it a straightforward Read category tool with low severity.
From the tool's definition Tool description states 'Return the Upgrade Helper diff for one changed file' — a retrieval operation that queries pre-generated diffs without modifying any data.
Attacks that exploit this kind of access
Return the Upgrade Helper diff for one changed file. It is categorised as a Read tool in the Rn Upgrade Helper MCP Server, which means it retrieves data without modifying state.
Register the Rn Upgrade Helper MCP server in PolicyLayer and add a rule for get_file_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 Rn Upgrade Helper. Nothing to install.
get_file_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 get_file_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 get_file_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.
get_file_diff is provided by the Rn Upgrade Helper MCP server (tanmay-girdhar/rn-upgrade-helper-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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