set_struct_member_default

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

Annotations already declare readOnly=false, destructive=true and idempotent=true, but the description adds genuinely useful context beyond them: the read-modify-write nature, engine-side type validation with 'honest error' semantics, and the concrete return shape. It stops short of explaining what the destructive overwrite loses, but the added detail is substantial.

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?

Front-loads the core action, then compactly adds validation/idempotency notes and a return-shape block. All sentences carry information relevant to correct invocation, though the parenthetical is slightly dense.

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?

With no output schema, the description usefully supplies the return object fields, and annotations plus prose together cover the mutation/idempotency profile. Given three fully documented required params, an agent has what it needs to call and interpret the tool.

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 the schema already documents all three parameters including format examples and the empty-string clear case. The description adds only a general note that the value is validated against the member's type; it does not expand per-parameter meaning beyond the schema.

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 (set) and precise resource (the default value of a user-defined struct member), which cleanly distinguishes it from the surrounding struct siblings (add_struct_member, remove_struct_member, rename_struct_member, get_struct_members). An agent can identify the operation without opening the schema.

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 when to use it (editing an existing member's default) but never states when-not to use it or names an alternative path such as add_struct_member for new members. Usage is inferable from the verb/resource but no explicit routing or prerequisites are given.

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