DLL Execution

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

Adds real context beyond the annotations: no cost, no API key/wallet/payment, and an explicit boundary list (no signing, broadcasting, custody, asset-delta/risk scan, or execution guarantee). It also warns that legacy Judgment stays unchanged and is not an automatic PASS. It does not contradict readOnlyHint=true; the only gap is no detail on latency or rate limits.

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?

Front-loaded with the trigger ('Before signing'), and the dense single paragraph carries a lot of load-bearing information. Slight redundancy appears in the repeated capability-boundary statements (free/no key vs no signing/custody) and the twice-mentioned Judgment, which keeps it from a 5.

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 complex nested-schema tool with an output schema present, the description covers the prerequisites (free, no key), the optional fee path, where to read results (http_status, response.judgment, response.simulation), and the hand-off to verify_transaction. Nothing needed to call it correctly is missing.

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?

Over a low 33% schema-description coverage, the prose still explains the candidate tuple (chain_id/from/to/value/data), that constraints are L2 fee/destination constraints, and that fee_estimation is an opt-in EIP-1559 context that reports L1/L2/Operator/Total fees separately. It does not disambiguate denied_to vs allowed_to, but adds meaningful semantic framing the schema lacks.

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?

States a specific verb+resource (simulate one unsigned Base Mainnet candidate) and enumerates what is inspected: call success/revert, destination, L2 fee constraints, Judgment, reason codes and evidence. It also explicitly separates itself from the sibling by noting verify_transaction is the post-broadcast tool.

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?

Gives a precise when-to-use trigger ('Before signing') and names the alternative plus its condition ('After broadcast use verify_transaction'). It also scopes optionality ('fee_estimation ... optionally') so the agent knows the fee block is not required.

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

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

Annotations only establish read-only/non-destructive, but the description adds cost and auth context ('Free; no API key, wallet or payment'), default vs. non-default checking behavior, and explicit scope limits ('VERIFIED is not finality, ownership, causality, asset-balance change verification or a swap economic-outcome guarantee'). It also warns that 'missing evidence is not success' and that readouts should come from http_status, response.verification.state and response.observation_errors, which goes well beyond the 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?

The usage trigger is front-loaded in the first clause and nearly every sentence carries load-bearing information (cost, defaults, scope exclusions, sibling routing). It is dense to the point of being clause-heavy, but there is little that could be cut without losing an actionable constraint.

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 verification tool with a nested expectation object, a sibling tool and an existing output schema, the description covers the calling context, defaults, cost, scope and error interpretation well; return-value explanation is rightly delegated to the output schema. The remaining gap is the precise comparison semantics of the candidate fields, which an agent must infer.

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 description coverage is 0%, so the description must compensate. It does partially: transaction_hash is named as required, the expectation categories (inclusion, receipt_status, candidate) are named, and the inclusion default is alluded to. However, it does not explain candidate-field matching semantics, the chain_id constraint, or the candidate field shapes, leaving real gaps against a zero-coverage nested schema.

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 states a specific verb (verify) and a precisely scoped resource (a Base Mainnet 8453 transaction), and enumerates what is checked: explicit inclusion, receipt-status, optional candidate-field expectations. It also names the sibling preflight_transaction, so an agent can separate this from its counterpart without reading any schema.

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 an explicit when-to-use ('After independent broadcast') and an explicit alternative with its own condition ('Before signing use preflight_transaction'), plus the default-behavior caveat ('default checks inclusion, NOT receipt success'). An agent knows both when to call this and when to call the sibling instead.

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