switch_runner

Switch the active AI runner. Available: claude, codex, aider.

SERVERYaver SOURCEyaver-cli

Medium RISK CLASS

Category Write

Parameters 11 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-kivanccakmak-yaver/switch-runner.md

WHAT IT DOES

What switch_runner does on Yaver

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

Parameter	Type	Required	Description
`runner_id`	string	Yes	Runner ID — claude, codex, or opencode.

Parameters from the server's own tool schema.

RISK

Why switch_runner is rated Medium

This tool modifies the active configuration/state of the system by switching which AI runner is active. It is reversible (you can switch back), so it falls under Write rather than Destructive. Misuse could disrupt ongoing operations by switching runners unexpectedly, giving it medium severity.

From the tool's definition Switch the active AI runner. Available: claude, codex, aider.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs switch_runner safely

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

switch_runner Rate-limited

switch_runner 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": {
    "switch_runner": {
      "limits": [
        {
          "counter": "switch_runner_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 Yaver, apply this rule, and every switch_runner call is checked against it from then on.

FAQ

Questions about switch_runner

What does the switch_runner tool do? +

Switch the active AI runner. Available: claude, codex, aider. It is categorised as a Write tool in the Yaver MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does switch_runner accept? +

switch_runner accepts 1 parameter: runner_id. Required: runner_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on switch_runner? +

Register the Yaver MCP server in PolicyLayer and add a rule for switch_runner: 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 Yaver. Nothing to install.

What risk level is switch_runner? +

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

Can I rate-limit switch_runner? +

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

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

switch_runner is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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