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

Beyond the annotations, it discloses the management-permission requirement, that the operation fully replaces the form, that series_default clears the session override and propagates to inherited sessions, that the version is bound to a transaction, that no invitations are sent, and the preview/confirmation safety flow. This is rich behavioral context that annotations alone (readOnly=false, destructive=false) do not convey.

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?

A single dense paragraph that front-loads the permission requirement and core action before scope semantics, side effects, and the preview flow. Every clause earns its place, though the packing is heavy for non-native readers.

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 mutation tool with nested config, no output schema, and 0% param coverage, it covers the essential safety workflow, scope semantics, and side effects. Remaining gaps (activityRef meaning, return shape) are minor given no output schema is declared.

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%, so the description must carry the load, and it does for the critical params: it explains the scope enum semantics, the preview default, and the previewHash confirmation mechanism, plus that config is the form body. activityRef and the nested config field internals are left to the schema, so it is strong but not exhaustive.

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?

The description states a specific verb+resource: it does a full replacement ('整份替换表单') of the activity guest profile form, and flags that management permission is required. This clearly separates it from siblings like update_my_guest_profile or add_activity_guest, though it does not explicitly name a sibling to route against.

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?

It explicitly describes when each scope applies (series_default changes the series default and clears the session override, affecting inherited sessions) and lays out the two-phase workflow: preview by default, then confirm with the same params plus previewHash and preview=false, re-confirming on any change. An agent knows exactly how to sequence the call.

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