Read a UTF-8 text file from the workspace. Returns the full contents.
AI agents call read_file to retrieve information from Copilot Studio Code without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries file contents from the local filesystem without modification, deletion, or execution. It is a straightforward Read operation with minimal risk unless the workspace contains highly sensitive credentials or trade secrets, but the tool itself performs no destructive or active operations.
From the tool's definition Tool description explicitly states it 'Read[s] a UTF-8 text file' and 'Returns the full contents.' The name is 'read_file' and function is retrieval-only with no side effects.
Documented attack patterns abuse exactly the kind of access read_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Copilot Studio Code, and nothing reaches the server without passing your rules. This is the rule we recommend for read_file:
{
"version": "1",
"default": "deny",
"tools": {
"read_file": {}
}
}read_file is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read a UTF-8 text file from the workspace. Returns the full contents. It is categorised as a Read tool in the Copilot Studio Code MCP Server, which means it retrieves data without modifying state.
Register the Copilot Studio Code MCP server in PolicyLayer and add a rule for read_file: 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 Copilot Studio Code. Nothing to install.
read_file 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 read_file 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 read_file. 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.
read_file is provided by the Copilot Studio Code MCP server (taiki-yoshida/copilot-studio-code). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Copilot Studio Code, 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 Copilot Studio Code tools catalogued and risk-classified — across an index of 43,000+ MCP servers.