sheets_update_values

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

Minimal disclosure: only states 'overwrite'. No information about destructive behavior, permissions needed, or side effects on cells outside the range. Annotations are absent, so description should carry this burden but fails.

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?

Very short and front-loaded, but lacks critical details. Conciseness is acceptable but not optimal; it is only one sentence which omits necessary clarification.

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?

Incomplete given the tool's complexity (4 params, write operation, no output schema). Lacks explanation of required permissions, behavior with overlapping ranges, or how values array must align with the range.

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 has 50% coverage (descriptions for values and valueInputOption). Description adds no extra meaning for range or spreadsheetId. It does not explain range format or constraints, relying on implicit knowledge.

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?

Clearly states the action (overwrite values) and resource (Google Sheet range). However, it does not differentiate from sibling tools like sheets_append_values or sheets_clear_values, which might cause confusion.

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?

No guidance on when to use this tool vs alternatives. Lacks context about prerequisites, when it is appropriate, or when to avoid it.

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