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

With no annotations, the description carries the full burden of behavioral disclosure. It only says 'update,' which signals mutation, but it does not state whether updates are partial or full, whether permissions are required, what side effects occur, or what the response looks like. This is a meaningful 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?

A single sentence with no wasted words. The core verb and resource are front-loaded, making the description easy to parse. While it is under-specified, the conciseness itself is exemplary.

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?

The tool has 7 parameters, no annotations, no output schema, and only 29% schema description coverage. The description does not even mention which fields can be updated, required identifiers beyond the schema, or any behavioral constraints. This is far from complete enough for an agent to invoke it confidently.

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 29%, and the description does not compensate by naming any updatable fields. Params like body, stage, title, version, and visibility are left without any semantic explanation in either the schema or the description. The description adds no parameter-level value.

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 uses a specific verb and resource: 'Update an existing timeline entry.' It clearly identifies the operation and distinguishes it from create_entry and delete_entry by emphasizing 'existing.' It does not, however, elaborate on what fields or semantics are involved, so it falls just 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?

There is no guidance on when to use this tool versus alternatives such as create_entry, delete_entry, or update_element. The word 'existing' implies this is not for new entries, but no explicit conditions, prerequisites, or exclusions are provided.

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