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 commands/open-agent-tools/postcard/inboxgit clone --depth 1 https://github.com/Open-Agent-Tools/PostcardWhat 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 | $0.00015 | $0.00143 |
| Opus 5 | $0.00008 | $0.00072 |
| Sonnet 5 | $0.00003 | $0.00029 |
| Haiku 4.5 | $0.00002 | $0.00014 |
Grade A, and why
inbox 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 2d 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
Run: oat-postcard inbox $ARGUMENTS
Shows the last N postcards addressed to this session (default 20), one
line per entry. Pass --watch to tail mode (prints new arrivals as
they land; exits on Ctrl-C). A ↳-prefixed id on a line means the
postcard is a reply to that earlier postcard.
Incoming mail is triaged automatically on every turn by the
postcard-reader subagent — this command is for passive observation,
not to trigger triage.
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.
- 2d ago First seen · 16 lines · 15 tokens per session scan A 92b2206b7ac4
inbox is a command published in the GitHub repository Open-Agent-Tools/Postcard (2 stars, last pushed 22d ago), licensed MIT. It adds 15 tokens to every session and 143 once invoked, about $0.0001 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.
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