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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=true, so the safety envelope is partly covered. The description adds real value beyond that: the required asset_condition_assessments:write scope (an auth prerequisite not in the schema) and the non-obvious caveat that the purchase-cost writeback is create-only. It does not explain the destructiveHint or what happens to fields left unspecified.

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 compact sentences with the core action front-loaded, followed by the auth requirement and the writeback caveat. Every sentence carries distinct information and nothing is padded.

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 update tool with an annotation-covered safety profile, a fully documented schema and no output schema, the description supplies purpose, scope requirement and a meaningful behavioral caveat. The remaining gap is partial-vs-full update semantics and the reasoning behind the destructive hint, which is minor.

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% and every parameter (id, notes, method enum, defects, assessed_on, assessor_id, condition_score, replacement_cost) is already documented in the schema. The description adds no parameter-level detail, so the baseline 3 is appropriate.

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 (Update) and a precise resource (asset condition assessment) plus the identity key (by ID), which cleanly separates it from the create/delete/get/list siblings. It stops short of naming any alternative tool, so it is clear but not sibling-differentiating beyond the resource name.

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?

"Update an existing ... by ID" implies the tool operates on a record that already exists, which is a usable usage cue. However it never states when to prefer this over siblings such as bulk_update (multiple records) or create_asset_condition_assessment (new records), so guidance is only implied.

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