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 beyarkay/claude-skills --skill drop-user-in-filegit clone --depth 1 https://github.com/beyarkay/claude-skillsWrote 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/beyarkay/claude-skills/drop-user-in-file)<a href="https://agentmods.dev/skills/beyarkay/claude-skills/drop-user-in-file"><img src="https://agentmods.dev/badge/skills/beyarkay/claude-skills/drop-user-in-file/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/beyarkay/claude-skills/drop-user-in-file"><img src="https://agentmods.dev/badge/skills/beyarkay/claude-skills/drop-user-in-file.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 | $0.00101 | $0.00698 |
| Opus 5 | $0.00051 | $0.00349 |
| Sonnet 5 | $0.00020 | $0.00140 |
| Haiku 4.5 | $0.00010 | $0.00070 |
Grade A, and why
drop-user-in-file 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 11d 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 — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
drop-user-in-file
Float an interactive nvim session in a tmux display-popup at PATH:LINE,
block until the user :qs, then print the before/after unified diff. Use it
whenever the user wants to make an edit by hand instead of dictating it to you —
prose they'd rather write themselves, a fiddly value, a judgement call about
wording, etc.
How to run
Invoke the bundled script via Bash with a long timeout (it blocks for the whole edit session — the user may take minutes):
~/.claude/skills/drop-user-in-file/drop-user-in-file PATH [LINE]
PATH— file to open (relative paths resolve against the current working directory; the file is created if it doesn't exist yet).LINE— optional line number to open at (default 1).- Set the Bash tool
timeoutto something generous, e.g.600000(10 min), so the call doesn't time out while the user is typing.
After it returns, read the printed unified diff to see exactly what they changed, and continue from there. Do not re-open the file to "verify" — the diff is the source of truth.
What it does / how it works
- Runs from Claude's TTY-less Bash subshell, but
tmux display-popuptalks to the tmux server, which paints the popup onto the user's attached client.display-popup -Eblocks the invoking shell until nvim exits, so the tool call naturally waits for the edit to finish. - Window-gated: if this Claude's tmux window isn't the one the user is
currently viewing, the popup does not ambush whatever they're looking at.
Instead the window is renamed
✎ EDIT WAITING — …and the popup only appears once they switch back to it. (No desktop notification, by design.) - The popup is top-anchored and leaves ~20 rows at the bottom uncovered so the user can still read your latest message while editing.
- On return it diffs a pre-edit backup against the saved file and prints the
full unified diff (never truncated). It reports
no changesif they:qwithout saving, and notes if the file still doesn't exist afterwards.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 11d ago First seen · 56 lines · 101 tokens per session scan A 3db9025e5df2
drop-user-in-file is a skill published in the GitHub repository beyarkay/claude-skills (2 stars, last pushed 1mo ago), licensed MIT. It adds 101 tokens to every session and 698 once invoked, about $0.0005 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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