update_item

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

With no annotations, the description carries the full transparency burden. It does disclose a key behavioral trait: shallow merge into the existing record, which clarifies merge semantics. However, it omits other important traits for a mutation tool, such as permissions, irreversibility, side effects, or return values.

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?

One concise sentence, front-loaded with the action and scope, followed by a parenthetical that adds essential semantics. No filler or repetition; every word earns its place.

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 description adequately covers the core operation and merge behavior, and the schema documents all parameters. However, with no annotations and no output schema, it leaves gaps around return values, error handling, and broader usage context, making it minimally adequate rather than complete.

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% with clear per-parameter descriptions, so the baseline is 3. The description adds meaning by explaining 'shallow merge', which directly clarifies how the 'updates' parameter will be applied, exceeding what the schema provides for that key parameter.

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 it updates an item's properties, using the specific verb 'Update' and resource 'item's properties'. The parenthetical 'shallow merge into the existing record' adds precise scope and distinguishes it from replace-style tools or other update tools.

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 usage when modifying existing item properties, but it does not explicitly mention alternatives (like create_item) or exclusion scenarios. No 'when not to use' guidance is provided, leaving the decision to the agent based on the tool's name and generic action.

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