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/adolfousier/opencrabs/a2a-gatewaynpx skills add adolfousier/opencrabs --skill a2a-gatewaygit clone --depth 1 https://github.com/adolfousier/opencrabsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/adolfousier/opencrabs/a2a-gateway)<a href="https://agentmods.dev/skills/adolfousier/opencrabs/a2a-gateway"><img src="https://agentmods.dev/badge/skills/adolfousier/opencrabs/a2a-gateway.svg" alt="Measured on agentmods" height="20"></a>What 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 5.1 | $0.00045 | $0.00402 |
| Opus 5 | $0.00023 | $0.00201 |
| Sonnet 5 | $0.00009 | $0.00080 |
| Haiku 4.5 | $0.00005 | $0.00040 |
Grade A, and why
a2a-gateway scanned grade A with 0 findings 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 7d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
A2A Gateway Reference
OpenCrabs exposes an A2A Protocol HTTP gateway for peer-to-peer agent communication.
What it does
Other A2A-compatible agents send tasks via JSON-RPC 2.0. OpenCrabs processes them using its full tool suite and returns results.
Endpoints
GET /.well-known/agent.json— Agent Card discovery (skills, capabilities)POST /a2a/v1— JSON-RPC 2.0 (message/send,tasks/get,tasks/cancel)GET /a2a/health— Health check
Setup
Enable in ~/.opencrabs/config.toml:
[a2a]
enabled = true
bind = "127.0.0.1"
port = 18790
Bee Colony Debate
Multi-agent structured debate with knowledge-enriched context from QMD memory search. Configurable rounds, confidence-weighted consensus based on ReConcile (ACL 2024).
Tool: a2a_send
| Param | Required | What |
|---|---|---|
action |
Yes | discover, send, get, cancel |
url |
Yes | Base URL of remote agent (e.g. http://127.0.0.1:18790) |
message |
For send |
Text to send |
task_id |
For get/cancel |
Task ID to check/cancel |
context_id |
Optional | Continue a conversation |
api_key |
Optional | Bearer token for authenticated endpoints |
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.
- 7d ago First seen · 45 lines · 45 tokens per session scan A ba5aa84db99f
a2a-gateway is a skill published in the GitHub repository adolfousier/opencrabs (927 stars, last pushed today), licensed MIT. It adds 45 tokens to every session and 402 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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