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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the description isn't needed for the safety profile. It adds real non-annotated behavior: the possible needs_confirmation response, the requirement to get user approval and re-call with approvalId, and a data-fidelity constraint ('only record what the human has actually told you'). It doesn't describe the created return shape, but no output schema exists so a full 5 isn't warranted.

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?

Four tight sentences, front-loaded with the create action, followed by the dedupe check, the approval flow, and the fidelity constraint. Every sentence earns its place with no repetition of schema content.

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 7-param create tool with no output schema, the description covers purpose, routing, and the non-obvious confirmation round-trip well enough to call correctly. It stops short of explaining downstream effects of the created page or the full type taxonomy usage, but the schema fills those gaps.

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 all seven parameters (including the enum for visibility and the type taxonomy) are already fully documented. The description only ties the approvalId to the confirmation flow, which the schema explains anyway, so it adds little beyond structured fields. Baseline 3 applies.

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 (creates) plus resource and scope (a typed page in the workspace's Compass compendium), which cleanly separates it from compass_pages_update/list/search. It even names compass_pages_list as the sibling to consult first, so an agent can route correctly without opening a 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?

Explicit when-to-use and when-not guidance: 'Check compass_pages_list first — don't create a page for a subject the map already has; link to it instead.' It also documents the confirmation flow and what to do when needs_confirmation is returned.

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