add_circle_member_channel

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

Annotations only mark it as a non-read-only, non-destructive mutation. The description goes further by disclosing the 409 duplicate-channel-type response, server-side per-channel identifier validation, and the API-key prerequisite — concrete behavior an agent cannot get from the schema.

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

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

Front-loaded with the action and error semantics, then the identifier formats, then access requirements. Two tight paragraphs with no filler sentences, though the ACCESS boilerplate is somewhat bulky relative to the payload.

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

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

With no output schema, the description covers the failure mode (409), identifier formats, and auth setup, which is most of what an agent needs. It stops short of describing the success response or whether re-adding after removal behaves differently.

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

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

Schema description coverage is 100%, so the four parameters are already documented. The description repeats the identifier format and adds that validation is server-side per channel, but contributes no new semantics for id, member_id, or channel. Baseline 3 applies.

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

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

States a specific verb and resource (declare/add a channel for a Circle member) and names the artifact it operates on. It is recognizable against the sibling channel tools (list_circle_member_channels, remove_circle_member_channel) even though it never names them explicitly for contrast.

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

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

The ACCESS block gives a real prerequisite and one negative routing hint ('start_login does NOT open this tool'), but there is no guidance on when to choose this tool over add_circle_member, invite_circle_member, or the channel-list tools, nor what preconditions the member must satisfy.

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