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

Annotations already indicate idempotentHint=true, readOnlyHint=false, destructiveHint=false. The description adds meaningful context: scoped by identifier, persistence differences between authenticated users (persistent) and anonymous sessions (24 hours), and pairing with other tools. No contradiction. Slightly better than baseline due to extra detail.

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?

The description is four sentences, each serving a purpose: first states the core function, second gives usage context, third explains scope and persistence, fourth mentions pairing. No fluff. Optimally concise.

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?

Given the tool's simplicity (2 parameters, no output schema) and rich annotations, the description covers all necessary aspects: purpose, usage, storage behavior, and integration with siblings. It is fully complete for an agent to correctly select and invoke the tool.

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 clear descriptions for both key and value. The description adds value by giving example keys ('subject_property', 'target_ticker', 'user_preference') and value types ('findings, addresses, preferences, notes'), but does not substantially go beyond what the schema provides. 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 the tool's purpose: 'Save data the agent will need to reuse later' with specific verb (Save) and resource (data). It distinguishes from siblings by mentioning 'Pair with recall to retrieve later, forget to delete.' This meets the highest standard.

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?

The description provides explicit usage guidance: 'Use when you discover something worth carrying forward' with concrete examples (resolved ticker, target address, user preference, research subject). It also clarifies when not to use by noting the pairing with recall and forget. This is exemplary.

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