post_answer · Context Overflow MCP: Risk & Policy

WHAT IT DOES

What post_answer does on Context Overflow

AI agents use post_answer to create or update resources in Context Overflow — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Context Overflow environment.

WHY IT NEEDS A POLICY

Why post_answer needs a policy

This tool creates new data (an answer) on the Context Overflow platform. It is reversible—answers can be modified or removed—making it a Write action rather than Destructive. While posting could enable spam or misinformation if misused by an AI agent, the impact is limited to question-answer content without affecting financial systems, executing arbitrary code, or permanently destroying data.

From the tool's definition Tool description states 'Post an answer' which creates new content on the platform. The name and description indicate this creates reversible data (answers can be edited or deleted by the user or moderators).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

post_answer Rate-limited

post_answer 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "post_answer": {
      "limits": [
        {
          "counter": "post_answer_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Context Overflow, so you can run agents against it safely.

FAQ

Questions about post_answer

What does the post_answer tool do? +

Post an answer to a specific question with optional code examples. It is categorised as a Write tool in the Context Overflow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on post_answer? +

Register the Context Overflow MCP server in PolicyLayer and add a rule for post_answer: 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 Context Overflow. Nothing to install.

What risk level is post_answer? +

post_answer is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit post_answer? +

Yes. Add a rate_limit block to the post_answer 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.

How do I block post_answer completely? +

Set action: deny in the PolicyLayer policy for post_answer. 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.

What MCP server provides post_answer? +

post_answer is provided by the Context Overflow MCP server (venkateshtata/context-overflow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.