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 dakshaymehta/cardputer-claude-os --skill cardputer-companiongit clone --depth 1 https://github.com/dakshaymehta/cardputer-claude-osWrote 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/dakshaymehta/cardputer-claude-os/cardputer-companion)<a href="https://agentmods.dev/skills/dakshaymehta/cardputer-claude-os/cardputer-companion"><img src="https://agentmods.dev/badge/skills/dakshaymehta/cardputer-claude-os/cardputer-companion/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/dakshaymehta/cardputer-claude-os/cardputer-companion"><img src="https://agentmods.dev/badge/skills/dakshaymehta/cardputer-claude-os/cardputer-companion.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 | $0.00169 | $0.02542 |
| Opus 5 | $0.00084 | $0.01271 |
| Sonnet 5 | $0.00034 | $0.00508 |
| Haiku 4.5 | $0.00017 | $0.00254 |
Grade C, and why
cardputer-companion scanned grade C with 1 finding 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 12d 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- `rm -rf`, mass file deletion, or destroying uncommitted work How it starts
The opening of the file, as written. The whole thing — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cardputer Companion
The Cardputer is a credit-card-sized handheld the user carries in their pocket.
It exposes MCP tools over a BLE bridge — notify, ask, confirm, show, and
progress — provided by the cardputer MCP server in this repo (mcp/server.py).
Those tools are the hands. This skill is the manners: it tells you when
to reach for them and how to shape what you send, so the device stays
useful instead of annoying.
These rules apply no matter where you run. The same tools reach the same
device whether you're local Claude Code over loopback or a cloud Managed Agent /
Messages-API agent over an MCP tunnel (tunnel/). If anything, restraint and the
fail-closed confirm discipline matter more when you're an unattended cloud
agent — the user isn't watching a terminal, and the physical gesture is the only
thing standing between you and an irreversible mistake. The device shows which
agent is asking on every ask/confirm banner (derived from your bearer
token, so you can't misrepresent it) — keep your requests honest and legible.
Core ethos: default to silence
A buzz should mean something. The user is wearing this thing; every alert costs
their attention. Earn each one. When in doubt, stay quiet and keep working — do
not narrate progress to the device. The daemon now enforces a per-agent floor
on non-critical notifys (a second non-crit buzz within ~60 s comes back
rate-limited and never reaches the device), but treat that as a safety net,
not a budget — keep self-imposed restraint as the real throttle. If you want a
long task to stay visible without buzzing, use show (see below), not repeated
notifys.
1. Confirm policy — mandatory, non-negotiable
Before any irreversible operation, call cardputer.confirm and wait for the
physical hold gesture. Do not substitute a chat-message "are you sure?" —
the whole point is that no tool output or prompt injection can synthesize a
sustained physical keypress, but it can forge a convincing chat confirmation.
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.
- 12d ago First seen · 180 lines · 0 tokens per session scan C 70610f8f3886
cardputer-companion is a skill published in the GitHub repository dakshaymehta/cardputer-claude-os (202 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 169 tokens to every session and 2,542 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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