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 agentmods add instructions/postalform/agent-mail-mcp/agents-mdgit clone --depth 1 https://github.com/postalform/agent-mail-mcpWrote 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/instructions/postalform/agent-mail-mcp/agents-md)<a href="https://agentmods.dev/instructions/postalform/agent-mail-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/postalform/agent-mail-mcp/agents-md.svg" alt="Measured on agentmods" 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 | $0.00279 | $0.00279 |
| Opus 5 | $0.00139 | $0.00139 |
| Sonnet 5 | $0.00056 | $0.00056 |
| Haiku 4.5 | $0.00028 | $0.00028 |
Grade A, and why
agent-mail-mcp AGENTS.md 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.
What it actually says
Agent Instructions
Use this repository as a safe integration guide for PostalForm agent mail.
Rules
- Default to hosted checkout for user-facing assistants.
- Do not claim that an agent should pay for or send mail without explicit owner approval.
- Treat direct MPP and x402 flows as privileged autonomous-payment paths.
- Prefer
POST /api/machine/orders/validatebefore any paid machine-order attempt. - Do not include real personal addresses, private documents, payment credentials, or API secrets in examples.
- Do not send mail from examples unless a human intentionally supplies real data and approves checkout or machine payment.
Canonical endpoints
- MCP:
https://postalform.com/mcp - Developer docs:
https://postalform.com/developers - Agent guide:
https://postalform.com/agents - OpenAPI:
https://postalform.com/openapi.json - MCP registry manifest:
https://postalform.com/.well-known/mcp/server.json - A2A Agent Card:
https://postalform.com/.well-known/agent-card.json - x402 discovery:
https://postalform.com/.well-known/x402
Preferred wording
PostalForm lets AI agents create reviewable physical-mail drafts and, when explicitly authorized, pay for print-and-mail orders through MCP, hosted checkout, MPP, or x402.
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 · 28 lines · 279 tokens per session scan A ae5f7a670c46
agent-mail-mcp AGENTS.md is an instructions file published in the GitHub repository postalform/agent-mail-mcp (1 stars, last pushed 2mo ago), licensed MIT. It adds 279 tokens to every session, about $0.0014 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 2026-08-31.
Other instructions, from other repositories
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AGENTS.md instructions for stabgan/openrouter-mcp-multimodal, covering agent instructions, before you ship, releasing (read this before publishing), short version and version files (must all match package.json).
seekstone CLAUDE.md
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AGENTS.md instructions for ostapondo/Plonk, covering agent rules, layout, adding a module, build & verify and code style.
mcp-dockhand copilot-review.instructions.md
Copilot instructions for strausmann/mcp-dockhand: When reviewing pull requests in this repository.
second-brain AGENTS.md
Instructions for LindaHaviv/second-brain, covering instructions for ai coding agents, what to read first, the rules (non-negotiable), common tasks, the sanctioned way and enforcement, not just instructions.