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

Annotations already establish the mutation profile (readOnly=false, idempotent=false, destructive=false), and the description adds meaningful context beyond them: it creates an account, a membership, and a signature, and that passing group_id installs a group template. That cascade of side effects is not derivable from the schema or annotations. It stops short of noting error behavior (e.g., duplicate email) or return values.

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?

Two tight sentences with the core operation front-loaded and the group_id caveat immediately after. Every clause carries information; nothing is redundant padding.

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?

For a 7-parameter creation tool with no output schema, the description covers the essential behavior and the non-obvious group template effect. Minor gaps remain — nothing about what is returned (e.g., the new teammate's id) or how conflicts like an existing email are handled.

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 every parameter is already documented; the baseline is 3. The description's note about group_id installing a template mirrors the schema text rather than adding new semantics, so it does not exceed the schema's contribution.

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 ('Add a teammate to the workspace') and clarifies the side effects — account, membership, starting signature — so the agent knows this is a full provisioning operation, not just a contact record. It does not name or differentiate from siblings like update_teammate or add_teammates_to_group, which keeps it below a 5.

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 sentence about group_id implies a usage pattern (assign a group to get its template), and the schema points to list_groups, but the description never states when to use this versus update_teammate or add_teammates_to_group, nor any prerequisites. Usage is inferable but not spelled out.

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