affinity_keystroke · Affinity MCP Server MCP: Risk & Policy

WHAT IT DOES

What affinity_keystroke does on Affinity MCP Server

AI agents invoke affinity_keystroke to trigger actions in Affinity MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why affinity_keystroke needs a policy

Sending keystrokes with optional modifiers (e.g., Cmd+Z, Cmd+S, Delete) to a creative application via AppleScript/System Events constitutes executing arbitrary UI actions. The effects are highly dependent on arguments — keystrokes could trigger saves, deletions, exports, or destructive edits.

From the tool's definition Send a keystroke to Affinity with optional modifiers

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

affinity_keystroke Rate-limited

affinity_keystroke stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "affinity_keystroke": {
      "limits": [
        {
          "counter": "affinity_keystroke_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about affinity_keystroke

What does the affinity_keystroke tool do? +

Send a keystroke to Affinity with optional modifiers. It is categorised as a Execute tool in the Affinity MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on affinity_keystroke? +

Register the Affinity MCP Server MCP server in PolicyLayer and add a rule for affinity_keystroke: 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 Affinity MCP Server. Nothing to install.

What risk level is affinity_keystroke? +

affinity_keystroke is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit affinity_keystroke? +

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

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

affinity_keystroke is provided by the Affinity MCP Server MCP server (sekharmalla/affinity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.