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 skills add win4r/openclaw-a2a-gateway --skill skillgit clone --depth 1 https://github.com/win4r/openclaw-a2a-gatewayWrote 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/win4r/openclaw-a2a-gateway/skill)<a href="https://agentmods.dev/skills/win4r/openclaw-a2a-gateway/skill"><img src="https://agentmods.dev/badge/skills/win4r/openclaw-a2a-gateway/skill/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/win4r/openclaw-a2a-gateway/skill"><img src="https://agentmods.dev/badge/skills/win4r/openclaw-a2a-gateway/skill.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00130 | $0.02267 |
| Opus 5 | $0.00065 | $0.01133 |
| Sonnet 5 | $0.00026 | $0.00453 |
| Haiku 4.5 | $0.00013 | $0.00227 |
Grade D, and why
a2a-setup scanned grade D with 3 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 9d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo tailscale up Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://tailscale.com/install.sh | sh Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s http://localhost:18800/.well-known/agent-card.json | python3 -m json.tool How it starts
The opening of the file, as written. The whole thing — 235 lines — stays where its author put it; the contents beside it link to each section on GitHub.
A2A Gateway Setup
Configure the OpenClaw A2A Gateway plugin for cross-server agent-to-agent communication using the A2A v0.3.0 protocol.
Prerequisites
- OpenClaw ≥ 2026.3.0 installed and running on each server
- Network connectivity between servers (Tailscale recommended, LAN or public IP also work)
- Node.js ≥ 22
Step 1: Install the Plugin
mkdir -p <WORKSPACE>/plugins
cd <WORKSPACE>/plugins
git clone https://github.com/win4r/openclaw-a2a-gateway.git a2a-gateway
cd a2a-gateway
npm install --production
Replace <WORKSPACE> with the agent workspace path. Find it with:
openclaw config get agents.defaults.workspace
Step 2: Register Plugin in OpenClaw
Get current allowed plugins first to avoid overwriting:
openclaw config get plugins.allow
Then add a2a-gateway to the existing array (do NOT drop existing plugin ids):
# Example only — include your existing plugins too
openclaw config set plugins.allow '["<existing...>", "a2a-gateway"]'
openclaw config set plugins.load.paths '["<ABSOLUTE_PATH>/plugins/a2a-gateway"]'
openclaw config set plugins.entries.a2a-gateway.enabled true
Critical: Use the absolute path in plugins.load.paths. Relative paths will fail.
Step 3: Configure Agent Card
openclaw config set plugins.entries.a2a-gateway.config.agentCard.name '<AGENT_NAME>'
openclaw config set plugins.entries.a2a-gateway.config.agentCard.description '<DESCRIPTION>'
openclaw config set plugins.entries.a2a-gateway.config.agentCard.url 'http://<REACHABLE_IP>:18800/a2a/jsonrpc'
openclaw config set plugins.entries.a2a-gateway.config.agentCard.skills '[{"id":"chat","name":"chat","description":"Bridge chat/messages to OpenClaw agents"}]'
URL field rules
| Field | Points to | Example |
|---|---|---|
agentCard.url |
JSON-RPC endpoint (default) | http://100.x.x.x:18800/a2a/jsonrpc |
peers[].agentCardUrl |
Agent Card discovery (preferred) | http://100.x.x.x:18800/.well-known/agent-card.json |
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 235 lines · 130 tokens per session scan D a7e8a5daca84
a2a-setup is a skill published in the GitHub repository win4r/openclaw-a2a-gateway (555 stars, last pushed 1mo ago), licensed MIT. It adds 130 tokens to every session and 2,267 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it D with 3 findings (asks for root, downloads and executes remote code, 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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