Update Redmine Time Entry

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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=true, covering the safety profile. The description adds minimal behavioral context—it notes 'existing' (implying requirement of a valid ID) and lists updateable fields, but does not describe side effects (e.g., timestamp changes) or error handling. Given annotations cover the main traits, a 3 is appropriate.

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?

The description is extremely concise: one purpose sentence, a bullet list of parameters, and a one-word return note. It front-loads the core action and avoids redundancy. Every sentence earns its place with zero fluff.

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 update tool with no output schema, the description sufficiently covers the core action and lists updatable parameters. It doesn't explicitly mention that at least one field must be changed (though implied), nor does it describe what happens if the entry is not found—minor gaps. Given the tool's simplicity, this is close to complete but not perfect.

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 100%, so each parameter already has a description. The tool description merely lists param names ('hours / activity_id / spent_on / comments') without adding new details like value constraints or format specifics that aren't already in the schema. Since the schema carries the term semantics, the description adds no substantial extra meaning.

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 clearly states 'Update an existing time entry' which specifies a distinct verb, resource (time entry), and scope (existing). This unambiguously differentiates it from sibling tools like create_time_entry and delete_time_entry without needing to inspect schemas.

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 phrase 'existing time entry' provides clear context that this tool is for modifying an already-created entry, not for creating new ones. It does not explicitly name alternatives or state when *not* to use it, but the purpose is clear enough to guide an agent correctly.

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