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

With no annotations, the description carries the full burden and discloses extensive behavioral traits: $0.01 USDC cost on Base, recovery-token requirements, no new RPC/debit on recovery, foreign snapshot rejection, provider-failure-not-paid-success semantics, observation_saved=false/persistence_error meaning, and retention windows. This is unusually thorough disclosure of a paid tool's safety and failure profile.

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 a dense, run-on block that mixes payment, trial, recovery, retention and legal disclaimers without clear front-loading or organization. Valuable content is present, but it is packed so tightly that an agent must parse a wall of text to extract the core purpose.

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 an 8-parameter tool with no output schema and no annotations, the description covers behavior, failure modes, cost, and snapshot semantics well. It references return concepts like observation_saved and snapshot_id obliquely but never explains the output structure, which is the main residual gap since no output schema exists.

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%, so the schema already documents each parameter thoroughly. The description adds only light context ('optionally compare an owned prior snapshot', 'bounded selected events'), which maps to previous_snapshot but does not meaningfully exceed the 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 opening sentence names a specific verb and resource: observing code, proxy slots, getters, selected storage/ABI and bounded events at a finalized Base address, with optional snapshot comparison. It is precise about scope, though it does not explicitly route away from siblings like fresh402_token_facts or fresh402_check, leaving differentiation somewhat implicit.

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 gives some 'when to use' signals (single-provider evidence, unknown controls remain unknown, not complete history/financial advice) and detailed trial/prepaid usage. However, there is no explicit comparison against sibling observation tools, so the agent must infer which tool to choose among the fresh402 family.

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