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title: "OmniRoute A2A Server Documentation"
version: 3.8.2
lastUpdated: 2026-05-13
---
# OmniRoute A2A Server Documentation
> Agent-to-Agent Protocol v0.3 — OmniRoute as an intelligent routing agent
The A2A surface has two faces:
- **JSON-RPC 2.0** at `POST /a2a` (canonical entry point, defined in `src/app/a2a/route.ts`).
- **REST** under `/api/a2a/*` for dashboards and tooling (status, task list, cancel).
Tasks are tracked by `A2ATaskManager` (`src/lib/a2a/taskManager.ts`, default 5-minute TTL). Skills are dispatched via `A2A_SKILL_HANDLERS` in `src/lib/a2a/taskExecution.ts`.
## Agent Discovery
```bash
curl http://localhost:20128/.well-known/agent.json
```
Returns the Agent Card describing OmniRoute's capabilities, skills, and authentication requirements.
The Agent Card's `version` field is sourced from `process.env.npm_package_version` (see `src/app/.well-known/agent.json/route.ts:13`), so it stays auto-synced with `package.json` on every release.
---
## Authentication
All `/a2a` requests require an API key via the `Authorization` header:
```
Authorization: Bearer YOUR_OMNIROUTE_API_KEY
```
If no API key is configured on the server, authentication is bypassed.
## Enablement
A2A is controlled by the **Endpoints → A2A** toggle and is disabled by default. When disabled,
`GET /api/a2a/status` reports `status: "disabled"` and `online: false`; JSON-RPC calls to
`POST /a2a` return HTTP 503 with JSON-RPC error code `-32000`.
---
## JSON-RPC 2.0 Methods
### `message/send` — Synchronous Execution
Sends a message to a skill and waits for the complete response.
```bash
curl -X POST http://localhost:20128/a2a \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_KEY" \
-d '{
"jsonrpc": "2.0",
"id": "1",
"method": "message/send",
"params": {
"skill": "smart-routing",
"messages": [{"role": "user", "content": "Write a hello world in Python"}],
"metadata": {"model": "auto", "combo": "fast-coding"}
}
}'
```
**Response:**
```json
{
"jsonrpc": "2.0",
"id": "1",
"result": {
"task": { "id": "uuid", "state": "completed" },
"artifacts": [{ "type": "text", "content": "..." }],
"metadata": {
"routing_explanation": "Selected claude-sonnet via provider \"anthropic\" (latency: 1200ms, cost: $0.003)",
"cost_envelope": { "estimated": 0.005, "actual": 0.003, "currency": "USD" },
"resilience_trace": [
{ "event": "primary_selected", "provider": "anthropic", "timestamp": "..." }
],
"policy_verdict": { "allowed": true, "reason": "within budget and quota limits" }
}
}
}
```
### `message/stream` — SSE Streaming
Same as `message/send` but returns Server-Sent Events for real-time streaming.
```bash
curl -N -X POST http://localhost:20128/a2a \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_KEY" \
-d '{
"jsonrpc": "2.0",
"id": "1",
"method": "message/stream",
"params": {
"skill": "smart-routing",
"messages": [{"role": "user", "content": "Explain quantum computing"}]
}
}'
```
**SSE Events:**
```
data: {"jsonrpc":"2.0","method":"message/stream","params":{"task":{"id":"...","state":"working"},"chunk":{"type":"text","content":"..."}}}
: heartbeat 2026-03-03T17:00:00Z
data: {"jsonrpc":"2.0","method":"message/stream","params":{"task":{"id":"...","state":"completed"},"metadata":{...}}}
```
### `tasks/get` — Query Task Status
```bash
curl -X POST http://localhost:20128/a2a \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"jsonrpc":"2.0","id":"2","method":"tasks/get","params":{"taskId":"TASK_UUID"}}'
```
### `tasks/cancel` — Cancel a Task
```bash
curl -X POST http://localhost:20128/a2a \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"jsonrpc":"2.0","id":"3","method":"tasks/cancel","params":{"taskId":"TASK_UUID"}}'
```
---
## Available Skills
OmniRoute exposes 6 A2A skills wired in `src/lib/a2a/taskExecution.ts::A2A_SKILL_HANDLERS`. Each skill module lives in `src/lib/a2a/skills/`.
| Skill | ID | Description | Tags | Examples |
| :------------------ | :-------------------- | :------------------------------------------------------------------------------------------------------------ | :---------------------- | :-------------------------------------- |
| Smart Routing | `smart-routing` | Routes a prompt through the optimal provider/combo using OmniRoute's combo engine + scoring | routing, providers | "Route this prompt via the best model" |
| Quota Management | `quota-management` | Reports per-provider quota state, helps callers decide when to throttle/switch | quota, providers | "Check quota for anthropic" |
| Provider Discovery | `provider-discovery` | Lists installed providers with capabilities, free-tier flags, OAuth status | providers, discovery | "What providers are available?" |
| Cost Analysis | `cost-analysis` | Estimates cost of a request/conversation given the catalog + recent usage | cost, usage | "Estimate cost for this conversation" |
| Health Report | `health-report` | Aggregates circuit breaker, cooldown, lockout state per provider | health, resilience | "Show health status of all providers" |
| List Capabilities | `list-capabilities` | Returns the full 42-entry Agent Skills catalog as a markdown table with raw SKILL.md URLs for context injection | catalog, discovery, skills | "List all OmniRoute capabilities" |
> Note: the Agent Card description currently advertises "36+ providers" (`src/app/.well-known/agent.json/route.ts:26` and `:55`). The actual catalog has grown to 180+ providers — the string should be updated in a follow-up change (tracked as a separate doc/code TODO; not modified here).
### `list-capabilities` Skill Detail
The `list-capabilities` skill is particularly useful for external agents that need to discover what OmniRoute exposes before sending API calls. It returns a structured markdown table artifact:
```
| ID | Name | Category | Area | Endpoints/Commands | Raw URL |
| --- | --- | --- | --- | --- | --- |
| omni-auth | Auth & Sessions | api | auth | POST /api/auth/login, ... | https://raw.githubusercontent.com/... |
...
```
Each row includes the `rawUrl` column so agents can immediately fetch the full SKILL.md. The `metadata.totalSkills` field is always `42`. Implementation: `src/lib/a2a/skills/listCapabilities.ts`. See also [AGENT-SKILLS.md](./AGENT-SKILLS.md).
---
## REST API (auxiliary)
The JSON-RPC endpoint `/a2a` is the canonical A2A entry point. The REST endpoints below provide auxiliary access for dashboards and external tooling:
| Endpoint | Method | Description | Auth |
| :--------------------------- | :----- | :------------------------------- | :--------------------- |
| `/api/a2a/status` | GET | Server status, registered skills | (public) |
| `/api/a2a/tasks` | GET | List tasks with filters | management |
| `/api/a2a/tasks/[id]` | GET | Get task by ID | management |
| `/api/a2a/tasks/[id]/cancel` | POST | Cancel running task | management |
| `/.well-known/agent.json` | GET | Agent Card (A2A discovery) | (public, cached 3600s) |
---
## Adding a New Skill
1. **Create skill file:** `src/lib/a2a/skills/<your-skill>.ts`
Export an async function `(task: A2ATask) => Promise<{ artifacts, metadata }>`. Follow the shape of existing skills such as `smartRouting.ts`.
2. **Register handler:** in `src/lib/a2a/taskExecution.ts`, add an entry to `A2A_SKILL_HANDLERS`:
```typescript
export const A2A_SKILL_HANDLERS = {
// ...existing skills
"your-skill": async (task) => {
const skillModule = await import("./skills/yourSkill");
return skillModule.executeYourSkill(task);
},
};
```
3. **Expose in Agent Card:** in `src/app/.well-known/agent.json/route.ts`, append to the `skills` array:
```json
{
"id": "your-skill",
"name": "Your Skill",
"description": "Brief, intent-focused description",
"tags": ["routing", "quota"],
"examples": ["Sample natural-language invocation"]
}
```
4. **Write tests:** `tests/unit/a2a-<your-skill>.test.ts`. Cover happy path + error path.
5. **Document** the new skill in this file's `Available Skills` table.
---
## Task TTL
Tasks expire after `ttlMinutes` (default 5 min) — configured in the `A2ATaskManager` constructor at `src/lib/a2a/taskManager.ts:82`. To customize, fork the `A2ATaskManager` instantiation and pass a different value (e.g., `new A2ATaskManager(15)` for 15-minute TTL). A background interval sweeps expired tasks every 60 seconds.
---
## Task Lifecycle
```
submitted → working → completed
→ failed
→ cancelled
```
- Tasks expire after 5 minutes by default (see [Task TTL](#task-ttl))
- Terminal states: `completed`, `failed`, `cancelled`
- Event log tracks every state transition
---
## Error Codes
| Code | Meaning |
| :----- | :----------------------------- |
| -32700 | Parse error (invalid JSON) |
| -32600 | Invalid request / Unauthorized |
| -32601 | Method or skill not found |
| -32602 | Invalid params |
| -32603 | Internal error |
| -32000 | A2A endpoint is disabled |
---
## Integration Examples
### Python (requests)
```python
import requests
resp = requests.post("http://localhost:20128/a2a", json={
"jsonrpc": "2.0", "id": "1",
"method": "message/send",
"params": {
"skill": "smart-routing",
"messages": [{"role": "user", "content": "Hello"}]
}
}, headers={"Authorization": "Bearer YOUR_KEY"})
result = resp.json()["result"]
print(result["artifacts"][0]["content"])
print(result["metadata"]["routing_explanation"])
```
### TypeScript (fetch)
```typescript
const resp = await fetch("http://localhost:20128/a2a", {
method: "POST",
headers: {
"Content-Type": "application/json",
Authorization: "Bearer YOUR_KEY",
},
body: JSON.stringify({
jsonrpc: "2.0",
id: "1",
method: "message/send",
params: {
skill: "smart-routing",
messages: [{ role: "user", content: "Hello" }],
},
}),
});
const { result } = await resp.json();
console.log(result.metadata.routing_explanation);
```
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