Submit generated code for one chunk. Returns validation result, progress of all chunks, and the next chunk ready for generation (if any). Resubmitting the same chunkId overrides the previous result.
AI agents use codegen_submit_chunk to create or update resources in Pen — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pen environment.
The tool writes/updates code generation results and allows overriding previous submissions, which is a reversible modification operation. It does not delete data irreversibly, execute arbitrary external operations, or move money. The reversible nature of overriding results and its role in a code generation workflow places it in the Write category.
From the tool's definition Tool description states "Submit generated code for one chunk" and "Resubmitting the same chunkId overrides the previous result," indicating it creates or modifies code artifacts reversibly.
Attacks that exploit this kind of access
Submit generated code for one chunk. Returns validation result, progress of all chunks, and the next chunk ready for generation (if any). Resubmitting the same chunkId overrides the previous result. It is categorised as a Write tool in the Pen MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Pen MCP server in PolicyLayer and add a rule for codegen_submit_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 Pen. Nothing to install.
codegen_submit_chunk 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 codegen_submit_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 codegen_submit_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.
codegen_submit_chunk is provided by the Pen MCP server (@zseven-w/pen-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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