propose_fix

Submit exactly one minimal source patch in the 0 apply_patch DSL. The patch must only update the requested source file.

SERVER0sec SOURCE0sec-labs/0sec

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/0sec/propose-fix.md

WHAT IT DOES

What propose_fix does on 0sec

AI agents use propose_fix to create or update resources in 0sec, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 0sec environment.

RISK

Why propose_fix is rated Medium

Creates or modifies source code reversibly via patch submission in a controlled DSL.

From the tool's definition Submit minimal source patch, update requested source file.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs propose_fix safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 0sec, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For propose_fix, this is the rule to start with:

propose_fix Rate-limited

propose_fix 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": {
    "propose_fix": {
      "limits": [
        {
          "counter": "propose_fix_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 0sec, apply this rule, and every propose_fix call is checked against it from then on.

FAQ

Questions about propose_fix

What does the propose_fix tool do? +

Submit exactly one minimal source patch in the 0 apply_patch DSL. The patch must only update the requested source file. It is categorised as a Write tool in the 0sec MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on propose_fix? +

Register the 0sec MCP server in PolicyLayer and add a rule for propose_fix: 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 0sec. Nothing to install.

What risk level is propose_fix? +

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

Can I rate-limit propose_fix? +

Yes. Add a rate_limit block to the propose_fix 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 propose_fix completely? +

Set action: deny in the PolicyLayer policy for propose_fix. 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 propose_fix? +

propose_fix is provided by the 0sec MCP server (0sec-labs/0sec). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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