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 phamviet86/codex-a2a-gateway --skill codex-a2agit clone --depth 1 https://github.com/phamviet86/codex-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/phamviet86/codex-a2a-gateway/codex-a2a)<a href="https://agentmods.dev/skills/phamviet86/codex-a2a-gateway/codex-a2a"><img src="https://agentmods.dev/badge/skills/phamviet86/codex-a2a-gateway/codex-a2a/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/phamviet86/codex-a2a-gateway/codex-a2a"><img src="https://agentmods.dev/badge/skills/phamviet86/codex-a2a-gateway/codex-a2a.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 | $0.00044 | $0.00745 |
| Opus 5 | $0.00022 | $0.00373 |
| Sonnet 5 | $0.00009 | $0.00149 |
| Haiku 4.5 | $0.00004 | $0.00075 |
Grade A, and why
codex-a2a 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 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.
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 — 26 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use Codex A2A Gateway
Use the gateway when the user asks for the other agent or delegation materially helps the task. Do simple work locally. The outbound tools route to Hermes's active default profile; a requested specialty is an instruction, not selection of a separate profile. Model/reasoning selection is available only on negotiated inbound A2A → Codex requests.
Codex → Hermes through MCP
- Start with
hermes_statuswhen readiness is unknown. If tools are missing, use the installedcodex-a2a-setupskill; setup details are not part of each delegation. - Call
hermes_chatwith the task, a stableconversation_key, and anidempotency_keyfor a new request that could change anything. Separate independent jobs into separate contexts; reuse the returnedcontext_idor conversation key for follow-ups. Include available realoriginconversation/question IDs for attribution; never invent a Desktop ID. - Long work uses
mode="async". Save the returnedbridge_task_id; usehermes_task_wait/hermes_task_getto retrieve it. Wait expiry means the task may still be active. Ambiguous transport results areoutcome_unknown, not permission to resend. Reconcile only saved task/message identities; preserve ambiguity when evidence is insufficient. - For
input_required, send the answer throughhermes_chatwith the existingtask_id, same context, and a newidempotency_keyfor the new answer. Ordinary follow-ups after completion use the same context and a new request identity. - Use
hermes_tasks_listto find durable handles andhermes_contextsto inspect/close local mappings. Cancellation viahermes_task_cancelis best-effort; never claim computation stopped unless upstream evidence proves it. - Consume the retrieved result in the originating task. Where supplied, check origin/result identity and acknowledge using
hermes_task_get(acknowledge_result_id=..., expected_origin=...). Results are pulled through get/wait, not automatically delivered into the Desktop conversation.
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 · 26 lines · 44 tokens per session scan A 668549c38d6a
codex-a2a is a skill published in the GitHub repository phamviet86/codex-a2a-gateway (0 stars, last pushed yesterday), licensed Apache-2.0. It adds 44 tokens to every session and 745 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 2026-09-14.
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A2A JSON-RPC Call
Call a peer agent's A2A JSON-RPC endpoint. Supports tasks/send (send a task message) and tasks/get (query task status).
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Fetch an A2A agent card JSON from a given endpoint URL. Tries direct GET first, then falls back to /.well-known/agent.json.
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Send an application message (MSG) to a specific IronMesh peer. Use when the user asks to "send X to agent Y" or "ping peer Z". Has side effects — only invoke when the user explicitly asks.
holix-cron
Schedule recurring agent tasks via Holix built-in gateway cron (not crontab or custom scripts).
ironmesh-audit
Tail the tamper-evident IronMesh audit log for security events. Use when investigating a TOFU mismatch, auth failure, peer dropping out, or a suspected attack.