Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/nirholas/xactions/a2a-multi-agentnpx skills add nirholas/XActions --skill a2a-multi-agentgit clone --depth 1 https://github.com/nirholas/XActionsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00100 | $0.01890 |
| Opus 5 | $0.00050 | $0.00945 |
| Sonnet 5 | $0.00020 | $0.00378 |
| Haiku 4.5 | $0.00010 | $0.00189 |
Grade A, and why
a2a-multi-agent scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://localhost:3100/a2a/health How it starts
The opening of the file, as written. The whole thing — 198 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: A2A Multi-Agent Orchestration
Turn XActions into an A2A-compatible agent that can discover, communicate with, and delegate tasks to other AI agents using Google's Agent-to-Agent protocol.
When to Use
- User wants to connect XActions with external AI agents
- User needs multi-agent orchestration (decompose → delegate → aggregate)
- User asks about A2A protocol, agent cards, or inter-agent communication
- User wants to run the A2A server or manage agent discovery
- User needs real-time task streaming between agents
Files
| File | Purpose |
|---|---|
src/a2a/types.js |
Shared constants, factories, validators |
src/a2a/skillRegistry.js |
MCP tool → A2A skill bridge |
src/a2a/agentCard.js |
Agent Card generation (.well-known/agent.json) |
src/a2a/taskManager.js |
Task lifecycle (create, transition, execute) |
src/a2a/bridge.js |
A2A ↔ MCP translation layer + NLP |
src/a2a/streaming.js |
SSE streaming for real-time updates |
src/a2a/push.js |
Webhook push notifications |
src/a2a/auth.js |
API key + JWT inter-agent auth |
src/a2a/discovery.js |
Agent registry, skill matching, trust scoring |
src/a2a/orchestrator.js |
Task decomposer + delegator + orchestrator |
src/a2a/server.js |
Express HTTP server (port 3100) |
src/a2a/index.js |
Barrel export + CLI commands + factory |
dashboard/a2a.html |
Web dashboard for monitoring |
Quick Start
Start the A2A server
# Via CLI
node src/a2a/server.js
# Directly
node src/a2a/server.js
# With session cookie for browser automation
node src/a2a/server.js --cookie "YOUR_X_SESSION_COOKIE"
Check health
curl http://localhost:3100/a2a/health
View Agent Card
curl http://localhost:3100/.well-known/agent.json
Send a task
curl -X POST http://localhost:3100/a2a/tasks \
-H "Content-Type: application/json" \
-d '{
"jsonrpc": "2.0",
"method": "tasks/send",
"params": {
"message": {
"role": "user",
"parts": [{"type": "text", "text": "get profile for @nichxbt"}]
}
},
"id": "1"
}'
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 198 lines · 100 tokens per session scan A 92b762c189d9
a2a-multi-agent is a skill published in the GitHub repository nirholas/XActions (496 stars, last pushed 5d ago), licensed Apache-2.0. It adds 100 tokens to every session and 1,890 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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