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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds real value beyond that by enumerating exactly what the `full` view returns (data, sources, outbound and inbound links, unmatched link targets) and by flagging that calls are free.

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 short sentences, front-loaded with the core action and the parameter contract before the optional detail. The closing note about Persona Search filter pages is somewhat tangential but earns its place by telling the agent what kind of content to expect.

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 two-parameter read tool with annotations and no output schema, the description covers the action, both view payloads, the default, and the cost. An agent has everything needed to call it correctly and anticipate the shape of the result.

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 0%, so the description must carry the load, and it does so for `view`: both enum values are defined with their payload differences and the default is restated. `slug` is only named ('by `slug`') without format or lookup hints, which is the one remaining gap.

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 ('Read one page of this workspace's second brain by `slug`'), scoping it to a single addressable document. That makes it clearly distinct from the sibling list/search/index tools without opening any 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 two view modes are explained and a default is named, which tells the agent how to call it, but there is no guidance on when to reach for this versus hyreflow_knowledge_search or hyreflow_knowledge_index. The trailing 'Free' hints at a cost trade-off against paid siblings but never makes the routing explicit.

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