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 gaelic-ghost/socket --skill operate-a2a-agent-integrationgit clone --depth 1 https://github.com/gaelic-ghost/socketWrote 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/gaelic-ghost/socket/operate-a2a-agent-integration)<a href="https://agentmods.dev/skills/gaelic-ghost/socket/operate-a2a-agent-integration"><img src="https://agentmods.dev/badge/skills/gaelic-ghost/socket/operate-a2a-agent-integration/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/gaelic-ghost/socket/operate-a2a-agent-integration"><img src="https://agentmods.dev/badge/skills/gaelic-ghost/socket/operate-a2a-agent-integration.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 | $0.00060 | $0.00790 |
| Opus 5.5 | $0.00024 | $0.00316 |
| Sonnet 5.5 | $0.00012 | $0.00158 |
| Haiku 4.5 | $0.00006 | $0.00079 |
Grade A, and why
operate-a2a-agent-integration 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Operate A2A Agent Integration
Use A2A when independently operated agents need to discover and delegate to each other across process, machine, or framework boundaries. Do not use A2A for editor-to-agent hosting (ACP), agent-to-tool calls (MCP), or in-process subagents.
Connection Workflow
- Name the client agent and remote A2A server, including who owns each model, credential set, tool policy, memory, and task store.
- Fetch the remote Agent Card and verify its advertised endpoint, protocol version and binding, skills, capabilities, and security schemes before sending work.
- Establish authentication out of band. Treat the card as discovery metadata, not proof that the advertised operator or endpoint is trustworthy.
- Choose a stateless
Messagefor an immediate exchange or a statefulTaskfor long-running, interruptible, or resumable work. - Preserve
contextIdfor related turns andtaskIdfor one task lifecycle. Do not substitute a local conversation or process identifier. - Use streaming only when both peers advertise it. Use push notifications only with an authenticated callback, SSRF controls, signature verification, and retry/idempotency rules.
- Handle
input-requiredandauth-requiredas interrupted states that need an explicit follow-up. Treatcompleted,canceled,rejected, andfailedas terminal. - Validate discovery, authentication, one harmless message, one stateful task, cancellation, streaming or push when advertised, and restart/reconnect behavior independently.
Read references/a2a-operations-map.md for the lifecycle, trust boundaries, and Hermes-specific surface.
Hermes A2A
- Use
hermes gateway setupto expose Hermes as an inbound A2A platform. - Enable the outbound
a2atoolset separately withhermes tools; it is off by default. - Configure named peers rather than embedding bearer tokens in prompts or checked-in files.
- Keep the default localhost bind when no token is configured. Remote exposure requires authentication, an explicit bind/public URL, allowlists, rate limits, and network controls.
- Preserve Hermes
contextIdcontinuity and inspect its A2A audit and conversation records when diagnosing routing or replay. - Prefer Hermes delegation or its durable local work queue for same-runtime collaboration; use A2A when the ownership boundary is genuinely external.
What ships with it
2 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.
- 1mo ago First seen · 75 lines · 60 tokens per session scan A 5c4dd641e872
operate-a2a-agent-integration is a skill published in the GitHub repository gaelic-ghost/socket (7 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 60 tokens to every session and 790 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.
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