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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds genuinely new behavioral context beyond that: the call is cheap, returns no file contents, and returns a metadata-plus-gist summary — useful since there is no output schema to describe the payload.

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?

Front-loaded with what is returned and the cost, followed by when to reach for it. Three sentences, all carrying weight; the closing note about project notes is slightly tangential but still informative.

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 usefully characterizes the return shape and cost, and annotations cover the read-only profile. It is nearly complete for a zero-required-param listing tool; only sibling differentiation and any pagination/scale limits are unaddressed.

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% and the single 'context' parameter is thoroughly documented in the schema, including the 'all' sentinel and matching behavior. The description says nothing about it, so it adds no meaning beyond the schema — 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+resource ('List every file in the user's portable memory') and enumerates what comes back: names, change times, one-line gist. It does not name or contrast with the sibling tools (history, recall, search_memories), so an agent must infer the distinction itself.

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 situational triggers — check what is already known before asking the user to repeat themselves or before claiming ignorance — which is stronger than generic 'use for listing' guidance. It stops short of naming an alternative (e.g. search_memories) or stating when this tool is the wrong choice.

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