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attestation_verify

Verifies an ed25519 attestation by recomputing the canonical hash, matching it with the signed hash, and checking the signature against the public key.

Instructions

Verify an ed25519 Attestation envelope (algorithm/signed_hash/signature/key_url/signed_at) against a body and a public key. Recomputes the canonical hash, checks it matches signed_hash, then verifies the ed25519 signature over the hash string. Returns { ok, reason? }. Public key accepted as 64-char hex or base64.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyYesThe body the attestation was minted over.
public_keyYes32-byte ed25519 verifying key as 64-char hex OR base64.
attestationYes
Behavior4/5

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

With no annotations, the description carries full burden. It explains the verification steps (recompute hash, compare, verify signature) and return format. It does not disclose potential failure reasons beyond 'reason?' or any edge cases, but the main behavior is clear.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two concise sentences, front-loaded with purpose and method. No unnecessary words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a cryptographic verification tool with no output schema, the description covers inputs, process, and return format. It lacks details on canonical hash algorithm or error handling, but is mostly complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 67%, but the description adds meaning by listing and explaining the attestation envelope fields and the public_key format (hex or base64). This compensates for missing descriptions in the schema, especially for nested attestation object.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool verifies an ed25519 Attestation envelope, listing the envelope fields and steps. It distinguishes itself from sibling verification tools by specifying the exact cryptographic operation and envelope format.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage context (verify attestations) but does not explicitly state when to use this tool over alternatives, nor does it provide exclusions or prerequisites.

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

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