HARP-PROMPT Test Vectors

This document provides deterministic canonicalization and hashing test vectors for the HARP-PROMPT extension.

Canonicalization Profile

Canonical JSON bytes are produced by:

• UTF-8 encoding
• Object keys sorted lexicographically
• No insignificant whitespace (separators , and :)
• No trailing newline

Implementations MUST reproduce the exact byte sequence below.

Test Vector 1: promptHash

PromptSignable (WITHOUT promptHash)

{
  "requestId": "01J2V9K3M2W1J5R6S7T8U9V0W1",
  "sessionId": "01J2V8V3M2YF0KX9Q0Z7E6H9R1",
  "repoRef": "repo:acme/widgets",
  "artifactType": "prompt.send",
  "createdAt": "2026-02-21T12:01:00Z",
  "target": "agentChat",
  "text": "Please summarize the plan and list risks. Keep it concise.",
  "promptHashAlg": "SHA-256"
}

Canonical bytes (UTF-8)

{"artifactType":"prompt.send","createdAt":"2026-02-21T12:01:00Z","promptHashAlg":"SHA-256","repoRef":"repo:acme/widgets","requestId":"01J2V9K3M2W1J5R6S7T8U9V0W1","sessionId":"01J2V8V3M2YF0KX9Q0Z7E6H9R1","target":"agentChat","text":"Please summarize the plan and list risks. Keep it concise."}

SHA-256 (hex)

0b18f65f2e4d81b0bbfa89267138163a439ee2381393f95b41f01fbdfdbabd50

Notes

• promptHash is computed over the canonical JSON of the prompt object excluding promptHash.
• If optional fields (e.g., metadata, extensions) are present, they MUST be included in the hash input.