AI agents use patch_text_file_contents to create or update resources in Mcp Text Editor — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Text Editor environment.
Patching modifies file contents reversibly; the changes can theoretically be undone by patching again. However, if the patch is applied to critical files (config, source code, deployment scripts), the impact could be significant. Severity is medium rather than high because the operation itself is reversible and requires an AI agent to intentionally target specific files to cause harm.
From the tool's definition Tool name 'patch_text_file_contents' and description 'Patch the contents of a text file' indicate modification of file data.
Documented attack patterns abuse exactly the kind of access patch_text_file_contents gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Text Editor, and nothing reaches the server without passing your rules. This is the rule we recommend for patch_text_file_contents:
{
"version": "1",
"default": "deny",
"tools": {
"patch_text_file_contents": {
"limits": [
{
"counter": "patch_text_file_contents_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}patch_text_file_contents stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Patch the contents of a text file. It is categorised as a Write tool in the Mcp Text Editor MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Text Editor MCP server in PolicyLayer and add a rule for patch_text_file_contents: 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 Mcp Text Editor. Nothing to install.
patch_text_file_contents is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the patch_text_file_contents 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 patch_text_file_contents. 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.
patch_text_file_contents is provided by the Mcp Text Editor MCP server (tumf/mcp-text-editor). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Mcp Text Editor tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
6 Mcp Text Editor tools catalogued and risk-classified — across an index of 42,500+ MCP servers.