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

Annotations already disclose that the operation is not read-only, is destructive, and is non-idempotent; the description adds the required API-key scope ('lists:write'). It does not elaborate on what 'destructive' means for list metadata, whether existing values are overwritten, or what happens to unspecified fields, leaving a significant behavioral gap for a mutation tool.

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?

Three short sentences, front-loaded with the operation and identifier format. Every sentence contributes useful information without repetition or filler.

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 an 8-parameter destructive mutation with only 25% schema description coverage and no output schema, the description is too sparse. Annotations cover the safety profile, but the description does not adequately document parameter semantics or the effects of the update.

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 only 25%, so the description must carry more weight. It adds the identifier format and optionality, but does not clarify the meaning of the other parameters (name, color, icon, isPrivate, description), leaving most of the 8 parameters undocumented.

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 ('Update list metadata') plus the identifier format ('tl_…'), making the operation clear. It does not explicitly distinguish itself from sibling list operations such as pm_create_list, pm_delete_list, or pm_update_task, so it falls short of 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 description implies use for updating an existing list and notes that all fields are optional, which helps callers understand partial updates. However, it provides no explicit when-to-use guidance, prerequisites, or alternatives to related tools such as pm_create_list or pm_delete_list.

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