find_chunks_for_files
AI agents call find_chunks_for_files to retrieve information from Diffchunk without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool appears to search or retrieve chunk metadata for specified files within a diff context. It performs no modifications, deletions, or executions—it simply retrieves information about which chunks correspond to given files, making it a Read category tool. The low blast radius (retrieving diff metadata cannot cause harm) justifies 'low' severity.
From the tool's definition The tool name 'find_chunks_for_files' combined with the server's purpose of 'efficiently navigate and analyze large diff files' and sibling tools like 'get_chunk', 'list_chunks', and 'get_file_diff' indicates this retrieves or queries chunk information.
Documented attack patterns abuse exactly the kind of access find_chunks_for_files gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Diffchunk, and nothing reaches the server without passing your rules. This is the rule we recommend for find_chunks_for_files:
{
"version": "1",
"default": "deny",
"tools": {
"find_chunks_for_files": {}
}
}find_chunks_for_files is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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find_chunks_for_files. It is categorised as a Read tool in the Diffchunk MCP Server, which means it retrieves data without modifying state.
Register the Diffchunk MCP server in PolicyLayer and add a rule for find_chunks_for_files: 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 Diffchunk. Nothing to install.
find_chunks_for_files 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 find_chunks_for_files 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 find_chunks_for_files. 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.
find_chunks_for_files is provided by the Diffchunk MCP server (peteretelej/diffchunk). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Diffchunk, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Diffchunk tools catalogued and risk-classified — across an index of 43,000+ MCP servers.