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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true. Description adds scoping detail ('Scoped to your identifier (anonymous IP, BYO key hash, or account ID)') and behavior when key is omitted (list all keys). No contradictions.

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: first states core purpose, second provides use cases, scoping, and pairings. No wasted words, efficient and clear.

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 1 optional parameter, no output schema, and informative annotations, the description adequately covers retrieval, listing, scoping, and paired tools. No gaps for agent decision-making.

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 has 1 parameter (key) with description 'Memory key to retrieve (omit to list all keys)' and 100% coverage. Description echoes this behavior but adds no new semantic detail beyond schema. Baseline 3 is appropriate.

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 clearly states 'Retrieve a value previously saved via remember, or list all saved keys (omit the key argument).' It specifies the action (retrieve/list) and resource (saved values/keys), and distinguishes from siblings by mentioning 'remember' and 'forget'.

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 explicit use cases: 'look up context the agent stored earlier — the user's target ticker, an address, prior research notes — without re-deriving it from scratch.' Implicitly suggests when to use (already saved) and not to use (if not saved), but lacks explicit when-not-to-use or alternatives beyond pairing with remember/forget.

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