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---
name: a2a-contract-framework
description: Framework for formalizing Agent-to-Agent (A2A) contracts to ensure deterministic collaboration.
tags: a2a, agent-orchestration, protocol, newos4
category: system
---
# A2A Contract Framework
## 1. Purpose
To move from "best-effort" delegation to "contractual" execution by defining a strict interface (`.contract.json`) for every agent role.
## 2. Contract Schema
Every agent must have an associated contract containing:
- `role`: The official designation (e.g., "researcher").
- `capabilities`: `string[]` of authorized toolsets.
- `input_schema`: JSON Schema defining required parameters.
- `output_schema`: JSON Schema defining guaranteed return format.
- `sla`: Response time goals and accuracy thresholds.
- `resource_weight`: Numeric value representing cognitive cost.
## 3. Workflow
1. **Handshake**: Orchestrator requests contract from Agent.
2. **Verification**: Orchestrator validates task against `input_schema`.
3. **Execution**: Agent executes using only `capabilities`.
4. **Validation**: Orchestrator validates result against `output_schema`.
## 4. Implementation Path
- Store contracts in `.contracts/` directory.
- Reference contracts during `spawn_agent` calls.
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