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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds useful behavioral detail beyond that: the result set is exhaustive, ordered oldest-first, and each item carries a description and last-modified timestamp. No caveats about output size or pagination are given, keeping it from a 5.

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 sentences, no filler. The payload content and ordering are front-loaded, and the usage cue follows without restating the name or annotations.

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?

With no output schema, the description must say what comes back, and it does: every document along with its description and last-changed time. Combined with annotations covering safety and idempotency, an agent has everything needed to call this correctly.

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?

The tool takes zero parameters, so the schema baseline applies and there is nothing the description could add or omit. It correctly implies a single, unfiltered call rather than suggesting hidden filtering options.

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 ('List every document in the knowledge base') plus the fields returned and ordering ('oldest first'). The word 'every' scopes it against the sibling kb_search, so an agent can tell a full enumeration from a query without opening the 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?

'Start here when reorganising or cleaning up' gives a concrete entry-point condition, which is meaningful guidance given siblings like kb_search, kb_read and kb_move. It stops short of explicit exclusions (e.g. 'use kb_search for keyword lookups'), so it does not reach the top band.

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