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

Annotations only cover idempotentHint and destructiveHint, and the description adds the crucial caveat that the first open by the owner pre-fills blank fields from the main profile — so it is not purely read-only despite looking like a getter. It also discloses return-shape privacy behavior: contact details are never returned in plaintext, only hasContact + contactMode, so they don't enter conversation context.

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?

Dense but front-loaded: the read-before-write rule comes first, then the sourcing chain, then the return-value caveat. The arrow notation packs the three-step flow efficiently, though the mixture of semicolons and parentheticals makes it slightly harder to scan than plain prose.

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 still describes what comes back (missing fields, photo-cutout status, completion flag, hasContact/contactMode) and flags the non-read-only side effect. Nothing an agent needs to call it correctly or interpret results is missing.

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 0% and the single guestId parameter is undocumented in the schema, but the description compensates by telling the agent exactly which sibling tools produce a valid guestId and that this must be done before updating. It does not add format/length detail, which is minor given the schema's minLength/maxLength constraints.

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 concrete verb+resource: read the current guest profile values before editing — what's missing, photo-cutout progress, whether it's complete. It is clearly distinguished from update_my_guest_profile and from the generic get_my_profile/get_my_signup_profile siblings through the guest-profile framing, though the distinction from get_my_signup_profile depends on the agent knowing 'guest' vs 'signup' domain terms.

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?

Gives an explicit workflow: obtain guestId from list_my_invitations / respond_activity_invitation, then call this, then write once with update_my_guest_profile. It also states the precondition ('before changing guest profile, read current values first'), leaving no ambiguity about ordering or alternatives.

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