credentials_set

Store or update a credential. Encrypts the value with AES-256-GCM and saves to ~/.aibtc/credentials.enc. If the service/key pair already exists, it is updated.

SERVERAibtc SOURCEaibtcdev/aibtc-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/io-github-aibtcdev-mcp-server/credentials-set.md

WHAT IT DOES

What credentials_set does on Aibtc

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

RISK

Why credentials_set is rated Medium

The tool performs a Write operation—it creates new credentials or modifies existing ones in an encrypted file. While it modifies sensitive authentication data, the action is reversible (credentials can be updated again or removed). It does not delete/destroy data (not Destructive), does not move money (not Financial), and does not execute arbitrary code (not Execute).

From the tool's definition Tool description states: 'Store or update a credential' and 'saves to ~/.aibtc/credentials.enc. If the service/key pair already exists, it is updated.' This is a reversible modification operation that creates or updates stored credential data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs credentials_set safely

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

credentials_set Rate-limited

credentials_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": {
    "credentials_set": {
      "limits": [
        {
          "counter": "credentials_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 Aibtc, apply this rule, and every credentials_set call is checked against it from then on.

FAQ

Questions about credentials_set

What does the credentials_set tool do? +

Store or update a credential. Encrypts the value with AES-256-GCM and saves to ~/.aibtc/credentials.enc. If the service/key pair already exists, it is updated. It is categorised as a Write tool in the Aibtc MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on credentials_set? +

Register the Aibtc MCP server in PolicyLayer and add a rule for credentials_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 Aibtc. Nothing to install.

What risk level is credentials_set? +

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

Can I rate-limit credentials_set? +

Yes. Add a rate_limit block to the credentials_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 credentials_set completely? +

Set action: deny in the PolicyLayer policy for credentials_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 credentials_set? +

credentials_set is provided by the Aibtc MCP server (aibtcdev/aibtc-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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