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 profile is covered by structured data. The description adds one genuinely useful behavioral fact (invalid keys fail with reason unknown-task), but is silent on what overwriting a prior status does and whether a status change is reversible.

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?

Two short sentences, front-loaded with the action and its value set, followed by the key-provenance and failure rule. No filler or redundancy in the prose itself.

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 three-parameter mutation with no output schema, the description covers the action, valid values, parameter provenance, and the main failure mode. It leaves a minor gap around permission/site scoping consequences, which the schema only partially backfills.

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 67% and the schema already documents taskKey formats and the siteId resolution rules, so the description's taskKey sentence largely restates it. The status enum is only listed, not explained (e.g. what 'dismissed' versus 'done' implies), and siteId is untouched in the 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 and resource ('Set a GEO action item's status') and enumerates the exact target values (open, in_progress, done, dismissed). It also anchors the tool to its data source, get_geo_actions, so an agent can separate this mutation from the read siblings in the list.

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?

Gives clear operating context: taskKey must come from get_geo_actions and a key outside the site's action plan is rejected. It doesn't state any when-not conditions or explicit alternatives, but for a status-setter on a known key there is no real competing sibling to route against.

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