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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety and repeat-safety profile is covered. The description adds genuine behavioral value by disclosing merge/partial-update semantics (omitted fields retain values), but says nothing about permissions, what happens to nested object contents, or failure behavior.

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?

A single front-loaded sentence with zero filler; the row target and the merge semantics are both delivered immediately.

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 4-parameter mutation tool with a nested data object, 25% schema coverage, and no output schema, the description is too thin. It never explains the required slug/site_id scoping or what the data object should contain, leaving the agent under-informed before a destructive write.

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 only 25% (row_id is the sole documented parameter). The description mentions row_id and hints at the data payload via 'omitted fields,' but leaves slug, site_id, and the contents/semantics of the nested data object entirely unexplained in both schema and description.

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 (partially update) on a specific resource (one row) identified by row_id, and the word 'partially' plus 'omitted fields keep their values' meaningfully separates it from create_collection_row and update_collection_schema. It stops short of naming a sibling alternative, so it is clear but not fully differentiated.

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?

There is no when-to-use guidance, no mention of when to prefer create_collection_row or update_collection_schema instead, and no stated prerequisites despite slug and row_id being required. The agent must infer all routing from the verb alone.

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