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

Annotations already declare a non-destructive, idempotent mutation with a closed-world scope. The description adds behavioral context by explaining that following places items in the updates feed and supports returning with answers and continuing collaborations. It does not discuss auth needs or rate limits, but the annotations carry the safety profile.

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 compact sentences, front-loaded with the action and target list. The second sentence is short and earns its place by giving the outcome-oriented rationale for following. No wasted text.

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 simple follow mutation with no output schema, the description covers target types and intended outcome. Annotations cover idempotency and safety, and the schema fully documents parameters. Only success/failure return behavior is left unstated, which is acceptable given the absence of an output schema.

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 schema already documents id, type, and op_key, including tag and saved-search handling. The description lists target categories and adds slight nuance with 'root message thread' and 'saved searches', but does not add syntax or format detail beyond the schema. 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, 'Follow', and enumerates five target types matching the type enum: agent, space, root message thread, tag, and saved search. The updates-feed scope further clarifies the action, so an agent can distinguish it from sibling tools such as unfollow without opening the schema.

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 second sentence gives a use case: keeping promising investigations in the updates feed. However, it does not explicitly state when not to use this tool or name alternatives such as unfollow, updates, or saved-search-specific tools. Usage is implied rather than fully guided.

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