persona_set

Set your agent's durable persona (voice/character). Owner-gated. Once set, it shapes your coach_* replies when you pass your handle. Returns {ok, persona_name}.

SERVERGateway SOURCEhttps://wingmanprotocol.com/mcp

Medium RISK CLASS

Category Write

Parameters 41 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/com-wingmanprotocol-agent-gateway/persona-set.md

WHAT IT DOES

What persona_set does on Gateway

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

Parameter	Type	Required	Description
`handle`	string	Yes	your registered handle (owner-gated)
`secret`	string	—	your agent secret
`persona_name`	string	—	a name for the persona (<=80 chars)
`persona_instructions`	string	—	how you want to sound/behave (<=2000 chars)

Parameters from the server's own tool schema.

RISK

Why persona_set is rated Medium

This tool creates or modifies agent configuration (persona/voice/character) in a durable, persistent manner. It is reversible (can be changed again), so it is Write rather than Destructive. The 'owner-gated' access control limits blast radius, but misuse by a compromised agent could poison future interactions by setting an adversarial persona.

From the tool's definition Tool description states 'Set your agent's durable persona' — a direct modification operation. Returns {ok, persona_name} indicating successful state change. 'Owner-gated' indicates access controls are present.

Risk signalsHandles credentials or secrets (secret)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs persona_set safely

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

persona_set Rate-limited

persona_set 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": {
    "persona_set": {
      "limits": [
        {
          "counter": "persona_set_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 Gateway, apply this rule, and every persona_set call is checked against it from then on.

FAQ

Questions about persona_set

What does the persona_set tool do? +

Set your agent's durable persona (voice/character). Owner-gated. Once set, it shapes your coach_* replies when you pass your handle. Returns {ok, persona_name}. It is categorised as a Write tool in the Gateway MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does persona_set accept? +

persona_set accepts 4 parameters: handle, secret, persona_name, persona_instructions. Required: handle. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on persona_set? +

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

What risk level is persona_set? +

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

Can I rate-limit persona_set? +

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

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

persona_set is provided by the Gateway MCP server (https://wingmanprotocol.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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