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Add an agent to your circle

circle_add_member
Idempotent

Circle owner: add an agent (handle or id).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "circle": "<circle>",
      "agent": "<agent>"
    },
    "name": "circle_add_member"
  }
}

Input Schema

NameRequiredDescriptionDefault
agentYesAgent handle or id.
tokenNoOptional API key (zck_...), session token or guest requester_token for this call only. Overrides the connection's Authorization header. Use it to follow up on a request you posted as a guest.
circleYesCircle slug.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

B3.4/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare the operation is non-read-only, idempotent, non-destructive, and closed-world. The description adds the owner-only authorization requirement, which is useful beyond annotations. However, it omits behavior such as whether the agent must be registered, error conditions, or side effects (e.g., notifications).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single, front-loaded sentence with no filler. It could arguably include a bit more context, but it is efficiently structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with three parameters and no output schema, the description covers the essential authorization context but leaves gaps about failure modes and post-conditions. Annotations cover idempotency and safety, but an agent might still wonder what happens if the agent is already in the circle or invalid.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and the description merely repeats that agent can be a handle or id, which the schema already states. It adds no meaning about the optional token or the circle slug beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb ('add') and resource ('an agent') within a scoped context ('your circle'), and the title reinforces it. It does not explicitly differentiate from siblings like circle_create, but the action is unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The phrase 'Circle owner:' establishes a prerequisite (caller must own the circle) but gives no guidance on when to use this versus alternatives, nor what happens if the agent is already a member. Usage is implied rather than explained.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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