Retrieve content of a specific chunk from an indexed file. Gets exact text segments identified during search. When to use this tool: - Get specific relevant sections after performing a search - Access only the most pertinent parts of large files - Retrieve content from high-scoring chunks identif...
AI agents call get_chunk to retrieve information from Directory Indexer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only retrieval of indexed file content without any side effects, modifications, or irreversible operations. It retrieves already-indexed text segments based on chunk IDs, making it a pure information retrieval operation. The severity is low as unauthorized access to local files poses minimal blast radius compared to destructive or financial operations.
From the tool's definition Tool description states "Retrieve content of a specific chunk from an indexed file. Gets exact text segments identified during search." and guidance specifies "Access only the most pertinent parts of large files" and "Avoid reading entire files when only…
Documented attack patterns abuse exactly the kind of access get_chunk gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Directory Indexer, and nothing reaches the server without passing your rules. This is the rule we recommend for get_chunk:
{
"version": "1",
"default": "deny",
"tools": {
"get_chunk": {}
}
}get_chunk is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve content of a specific chunk from an indexed file. Gets exact text segments identified during search. When to use this tool: - Get specific relevant sections after performing a search - Access only the most pertinent parts of large files - Retrieve content from high-scoring chunks identified in search results - Avoid reading entire files when only specific sections are needed How it works: - Files are split into overlapping text chunks during indexing - Each chunk has a sequential ID (. It is categorised as a Read tool in the Directory Indexer MCP Server, which means it retrieves data without modifying state.
Register the Directory Indexer MCP server in PolicyLayer and add a rule for get_chunk: 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 Directory Indexer. Nothing to install.
get_chunk 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_chunk 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_chunk. 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_chunk is provided by the Directory Indexer MCP server (peteretelej/directory-indexer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Directory Indexer, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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7 Directory Indexer tools catalogued and risk-classified — across an index of 43,000+ MCP servers.