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

Annotations already declare readOnlyHint and idempotentHint. The description adds that it is 'Scoped to your identifier (anonymous IP, BYO key hash, or account ID)' and explains the two modes (retrieve vs. list). This goes beyond the annotations without contradicting them.

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?

Three sentences: action, use case, scope/related tools. Each sentence adds distinct value; no redundant filler. Front-loaded with the core verb.

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 commands. It does not specify the return format for missing keys but is otherwise sufficient.

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 schema already provides a description for the key parameter with 100% coverage. The description restates the 'omit the key argument' behavior seen in the schema but adds no new parameter-level semantics. Per rubric, 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 uses specific verbs 'Retrieve' and 'list' and names the resource 'value previously saved via remember' or 'all saved keys'. It clearly differentiates from sibling tools by referencing remember and forget, establishing this as the read operation in the memory pair.

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?

It explicitly states 'Use to look up context the agent stored earlier' and gives examples (target ticker, address, research notes). It also mentions pairing with remember and forget, providing workflow guidance. However, it does not explicitly name alternative tools or exclusions, so it stops short of a 5.

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