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

The annotations already declare idempotentHint=true, destructiveHint=false and readOnlyHint=false, so the safety profile is covered. The description adds genuine value with partial-update semantics (unspecified fields are untouched), but says nothing about authentication requirements, whether it errors on unknown/no-op updates, or what is returned. Adequate, not rich.

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 short sentences, front-loaded with the action and the affected fields, with the partial-update caveat immediately after. Nothing is padded, though the field enumeration could be trimmed or made exhaustive rather than partial.

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 9-parameter mutation tool with no output schema, the description covers the core patch semantics but leaves out the auth credential's role, the null-clears-optional-fields convention, and two updatable fields. Sufficient to call correctly only if the agent reads the schema closely.

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 89%, so the baseline is 3. The description contributes one real piece of meaning the schema lacks — that omitted fields are preserved rather than reset — but it doesn't mention the null-to-clear convention or the manage_token requirement that govern several parameters.

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?

Uses a specific verb ("Change") on a specific resource ("a monitor") and enumerates the mutable fields. It clearly occupies a different role than its siblings (create_monitor, delete_monitor, get_status), but the field list is incomplete — min_gpu_pct and expected_model are silently omitted, so it doesn't fully describe its own surface.

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?

Implied usage is obvious from the name and sibling set, but the description never states when to reach for this versus create_monitor or delete_monitor, nor any prerequisite like needing the manage_token. "Only the fields you pass change" is a useful semantic hint but is not an explicit usage rule.

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