# Contract capability intersection

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

Intersect 2–8 supplied capability offers, exact protocol/version/media identifiers and bounded size intervals. Return a deterministic common proposal or explicit conflicts; no negotiation, schema compatibility proof or authorization occurs.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Find a common contract version and declared capabilities between agents
- Compare message and batch limits before exchanging artifacts

## Outside this profile
- Live negotiation, message delivery, queue consumption, remote pagination, artifact fetching or migration execution
- Authentication, signed provenance, authorization, schema compatibility proofs, or exactly-once guarantees
- Inferring absent versions, server state, missing history, semantic equivalence, or market uniqueness

Proposed nominal USD 0.005 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/contract-capability-negotiate.json)
- [Input schema](/reference/schemas/contract-capability-negotiate.input.json)
- [Output schema](/reference/schemas/contract-capability-negotiate.output.json)
- [Fixed example](/reference/examples/contract-capability-negotiate.json)
- [Complete HTML reference](/discover/tools/contract-capability-negotiate)