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 SoliEstre/EstreGenesis --skill constellation-a2a-emitgit clone --depth 1 https://github.com/SoliEstre/EstreGenesisWrote 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/soliestre/estregenesis/constellation-a2a-emit)<a href="https://agentmods.dev/skills/soliestre/estregenesis/constellation-a2a-emit"><img src="https://agentmods.dev/badge/skills/soliestre/estregenesis/constellation-a2a-emit/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/soliestre/estregenesis/constellation-a2a-emit"><img src="https://agentmods.dev/badge/skills/soliestre/estregenesis/constellation-a2a-emit.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 | $0.00111 | $0.00466 |
| Opus 5.5 | $0.00044 | $0.00186 |
| Sonnet 5.5 | $0.00022 | $0.00093 |
| Haiku 4.5 | $0.00011 | $0.00047 |
Grade A, and why
constellation-a2a-emit 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.
What it actually says
Emit a targeted A2A message
Use the constellation-mcp MCP server's a2a_emit tool to send a CUSTOM/{name} envelope through the live board's relay.
Required arguments
targetAgentId: the recipient (server resolves viaAgentList)name: one of the §13.16.9 A2A-intent allowlist (Report,Delegate,WorkerReport,PRRequest,BlockerManifest,ReviewSLAAck, etc.)value: the message payload (object — server applies §13.11.3 normalisation)
Pre-send discipline (§13.16.10)
ALWAYS probe the inbox via constellation-board first. If meaningful inbound has arrived since the last cursor, surface it BEFORE emitting (incorporate-and-proceed) or DEFER (the new inbound supersedes the planned send).
Ack handling (§13.13)
- The MCP server returns the server-stamped
msgIdimmediately (transport-tierAckarrives via the read interface). - For commitment-tier (
AckProcessed) or application-tier (Report/DONE/BLOCKED), poll viaboard_history_tailOR calla2a_wait_ack(msgId, tier, timeoutMs). - Do NOT blind-retry on missing ack; honor the §13.13 escalation ladder.
Spec source
Constellation.md §8.3 (write interface) + §13.11.3 (envelope normalisation) + §13.16.10 (pre-send probe) + §13.13 (ack 3-tier).
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 · 29 lines · 111 tokens per session scan A 9232d93e630a
constellation-a2a-emit is a skill published in the GitHub repository SoliEstre/EstreGenesis (8 stars, last pushed yesterday), licensed Apache-2.0. It adds 111 tokens to every session and 466 once invoked, about $0.0004 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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