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

Annotations already claim readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds valuable extra context: scoping ('Scoped to your identifier (anonymous IP, BYO key hash, or account ID)') and the list-all behavior, going beyond the structured annotations.

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 sentences, each earning its place: core action first, practical examples second, scoping third, complementary tools fourth. No fluff, well front-loaded.

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 simple tool with one optional parameter and no output schema, the description covers purpose, usage, scoping, and related tools. It lacks an edge-case explanation (e.g., behavior when key not found), but given the high-quality annotations and simple contract, this is nearly complete.

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% with a clear parameter description ('Memory key to retrieve (omit to list all keys)'). The description reinforces this but does not add substantial new semantic information about the parameter, so the 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?

The description opens with the core action 'Retrieve a value previously saved via remember, or list all saved keys', naming both primary and alternative behaviors. It clearly distinguishes from siblings by pairing with 'remember to save, forget to delete', positioning recall as the read path.

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?

Provides concrete use cases ('the user's target ticker, an address, prior research notes') to signal when to invoke, and references complementary tools (remember, forget). However, it stops short of explicit 'use X instead' exclusions, so a small guidance gap remains.

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