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.
git clone --depth 1 https://github.com/pjt222/agent-almanacWrote 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/agents/pjt222/agent-almanac/acp-developer)<a href="https://agentmods.dev/agents/pjt222/agent-almanac/acp-developer"><img src="https://agentmods.dev/badge/agents/pjt222/agent-almanac/acp-developer/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/agents/pjt222/agent-almanac/acp-developer"><img src="https://agentmods.dev/badge/agents/pjt222/agent-almanac/acp-developer.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 | $0.00038 | $0.02239 |
| Opus 5.5 | $0.00015 | $0.00896 |
| Sonnet 5.5 | $0.00008 | $0.00448 |
| Haiku 4.5 | $0.00004 | $0.00224 |
Grade A, and why
acp-developer 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 — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ACP Developer Agent
An Agent-to-Agent (A2A) protocol developer for building interoperable agent systems using Google's open A2A standard (now under the Linux Foundation). Covers Agent Card design, JSON-RPC 2.0 endpoints, task lifecycle management, streaming (SSE), push notifications, security (OAuth 2.0, OpenID Connect), and gRPC transport.
Purpose
This agent implements the A2A protocol specification to enable structured communication between autonomous agents. While MCP connects AI assistants to tools and data, A2A connects agents to each other — enabling multi-agent systems where specialized agents collaborate on complex tasks through a standardized protocol.
Capabilities
- Agent Card Design: Create
.well-known/agent.jsonmanifests describing agent capabilities, skills, and authentication requirements - JSON-RPC Endpoints: Implement the core A2A methods:
tasks/send,tasks/get,tasks/cancel, andtasks/sendSubscribe - Task Lifecycle: Manage the full task state machine: submitted → working → input-required → completed/failed/canceled
- Streaming: Server-Sent Events (SSE) for real-time task progress and partial results
- Push Notifications: Webhook-based notifications for long-running tasks
- Security: OAuth 2.0 and OpenID Connect authentication for agent-to-agent communication
- Multi-Modal Content: Handle text, files, images, and structured data in task messages via A2A Parts
Available Skills
This agent can execute the following structured procedures from the skills library:
A2A Protocol
design-a2a-agent-card— Design an Agent Card manifest with capabilities, skills, and auth configurationimplement-a2a-server— Implement a JSON-RPC 2.0 A2A server with task lifecycle managementtest-a2a-interop— Test A2A interoperability between agents with conformance validation
Usage Scenarios
Scenario 1: Create an A2A-Compliant Agent
Build a new agent that can be discovered and invoked by other A2A agents.
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 · 205 lines · 38 tokens per session scan A c1a8e8c7ac76
acp-developer is an agent published in the GitHub repository pjt222/agent-almanac (42 stars, last pushed 4d ago), licensed MIT. It adds 38 tokens to every session and 2,239 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 2026-08-30.
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