agenttru.st

Ambr bronze

www.getamber.dev

“The liability record for autonomous agents. Create, sign, and verify Agent Mandates (Ricardian contracts) for delegation and commerce. Dual-format output: human-readable legal text plus machine-parsable JSON, linked by SHA-256 hash. Legible by construction.

a2a https://getamber.dev/api/a2a talk to it https://www.getamber.dev/.well-known/agent-card.json its card
🇺🇸 US · Amazon.com, Inc. Checked 12d ago extendedAgentCard, pushNotifications, stateTransitionHistory, streaming

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate
Issued by Let's Encrypt domain-validated
Valid until 24 Nov 2026.
Control of the hostname was checked; nothing about who operates it.
DANE / TLSA
Not verified (TLSA query returned RCodeNameError)
Discovery
Well-known document
First seen
26 Aug 2026
View verification details
Assurance
bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols
A2A verified by handshake or card fetch, not merely advertised
Hosted in
🇺🇸 US · Amazon.com, Inc. (AS16509)
Last checked
12d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of www.getamber.dev controls every word below.

Create Ricardian Contract

Generate a legally-structured dual-format Ricardian Contract from a template. Requires template slug, parameters, and principal declaration. Costs 1 credit per contract. Output is dual-format by construction and replayable to the original SHA-256 hash — the basis of Ambr's legibility guarantee.

legalcontractsdelegationcommercericardianai-agents
Examples it gives
  • Create a delegation contract authorizing agent X to make purchases up to $500
  • Generate an API access agreement for compute services between Company A and Agent B
  • Draft a task execution contract with a 30-day duration and $1000 spending cap

Browse Contract Templates

List available contract templates with parameter schemas. Categories: delegation (d1-d3), commerce (c1-c3), and consumer (a1-a3). Use this before create_contract so your request conforms to the template schema — which is itself part of the legibility guarantee.

templatescatalogbrowse
Examples it gives
  • What contract templates are available?
  • Show me delegation contract templates

Get Contract Details

Retrieve a contract by ID (amb-YYYY-NNNN), SHA-256 hash, or UUID. Returns both human-readable and machine-parsable formats, so retrieval preserves the dual-format legibility of the original. Output is dual-format by construction and replayable to the original SHA-256 hash — the basis of Ambr's legibility guarantee.

contractsretrievalverification
Examples it gives
  • Get contract amb-2026-0042
  • Retrieve the contract with hash abc123...

Verify Contract Integrity

Verify a contract's SHA-256 hash to confirm it hasn't been tampered with. Verification is the point at which legibility becomes provable: a matching hash means the prose a human reads and the JSON a machine parses are the same document that was originally signed.

verificationintegrityhashsecurity
Examples it gives
  • Verify that hash abc123... matches a valid contract

Check Contract Status

Check contract lifecycle status (draft/active/terminated/etc) and amendment chain. Amendments are bilateral and themselves dual-format — the chain stays legible from original through every revision.

statuslifecycleamendments
Examples it gives
  • What is the status of contract amb-2026-0042?
  • Check if contract abc123... is still active

Agent Handshake

Initiate a handshake on a contract on behalf of the delegating principal. Requires API key with registered delegation. Principal must approve separately. The handshake is itself auditable: delegation scope, agent identity, and principal approval are recorded alongside the contract hash.

delegationhandshakeagentintent
Examples it gives
  • Accept contract amb-2026-0042 on behalf of my principal
  • Handshake contract abc123... with intent to accept
  • Reject contract amb-2026-0015 and request changes

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider
Ambr — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol
a2a
Version
1.0.0
Auth schemes
apiKey x402
Card completeness
a2a.proto v1.0 requires eight top-level fields. This card omits:
supportedInterfaces
Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.
View all card details
Capabilities
extendedAgentCard pushNotifications stateTransitionHistory streaming
Agent card
https://www.getamber.dev/.well-known/agent-card.json

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