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

Annotations already flag destructiveHint=true, openWorldHint=true and idempotentHint=true; the description adds genuinely new facts — the code is one-time and valid 7 days, and co-editors share the same cards without duplicates. However, it never explains why the operation is destructive (permanent access grant? irreversible? removable?) which is the most consequential annotation left unexplained.

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, front-loaded with the action, then the key mechanics (code lifetime, shared-edit outcome). Nothing is padding, though the second clause crams three distinct facts into one semicolon-joined fragment.

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 should say that the invite yields a join code returned to the caller — it only says 'give their AI agent the code' without stating where the code comes from. Combined with the unexplained destructive semantics, meaningful gaps remain for a 3-param mutation tool.

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 coverage is 100%, so project_ids, username and request_key are fully documented in the schema. The description adds only the vague 'they' for the invited party and 'same cards' for project scope, which marginally reinforces but does not extend the schema.

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 (invite a project co-editor) and implicitly links to the join_project counterpart that the invitee's agent will use. It is distinguishable from siblings like join_project or edit_company_team, but never names the counterpart explicitly or states scope limits (e.g. which projects can be shared).

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?

Mentions handing the one-time join_project code to the partner's agent, which implies the acceptance path, but there is no explicit when-to-use / when-not guidance and no prerequisites (ownership of the project, limits on co-editors). An agent must infer the workflow from the join_project mention alone.

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