Borrowing it
Nothing to install: this file belongs to mrmaciej1/justfill-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mrmaciej1/justfill-mcp/main/GEMINI.mdgit clone --depth 1 https://github.com/mrmaciej1/justfill-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/mrmaciej1/justfill-mcp/gemini-md)<a href="https://agentmods.dev/instructions/mrmaciej1/justfill-mcp/gemini-md"><img src="https://agentmods.dev/badge/instructions/mrmaciej1/justfill-mcp/gemini-md/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/instructions/mrmaciej1/justfill-mcp/gemini-md"><img src="https://agentmods.dev/badge/instructions/mrmaciej1/justfill-mcp/gemini-md.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 | $0.00427 | $0.00427 |
| Opus 5 | $0.00214 | $0.00214 |
| Sonnet 5 | $0.00085 | $0.00085 |
| Haiku 4.5 | $0.00043 | $0.00043 |
Grade A, and why
justfill-mcp GEMINI.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 9d 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
JustFill — filling PDF forms
You have JustFill tools for detecting and filling form fields in PDF documents (including flat scans and phone photos, which have no embedded form fields).
Workflow
open_pdf(path)— accepts PDFs and images (JPG/PNG/TIFF). Fields come from the best available source: a saved template (deterministic), embedded AcroForm fields, or ML detection with per-fieldconfidence.- If the source is ML detection, call
render_preview(page_index)and LOOK at the image: blue boxes are deterministic, green/orange/red are ML detections by confidence. Fix mistakes withadd_field/update_field/remove_field(batch:update_fields,remove_fields,prune_fields). render_filled_preview(values)— draw the values in place before filling; it costs nothing. Check placement and overflow.fill_pdf(values, output_path)— fills the document. Readwarningsin the response (values that will be shrunk or truncated) and fix them. Ifoutput_modeis "watermarked", tell the user before delivering the file.- If the form is likely to recur, call
save_template(name)— the nextopen_pdfof the same file returns exact verified fields instantly.
Auth
If tools fail with an authorization error, tell the user to run
uvx justfill-mcp login (one browser click while logged in to justfill.app)
or set the JUSTFILL_API_KEY environment variable (justfill.app → Account →
API Keys).
Conventions
- Coordinates are percentages of the page (0-100), origin top-left.
- Checkbox values: "yes"/"x"/"true" tick the box; leave absent to keep empty.
align/vertical_aligncontrol where text sits inside a field box — usealign: "right"for RTL forms.
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.
- 9d ago First seen · 36 lines · 427 tokens per session scan A 87449a0bb600
justfill-mcp GEMINI.md is an instructions file published in the GitHub repository mrmaciej1/justfill-mcp (0 stars, last pushed 2d ago), licensed MIT. It adds 427 tokens to every session, about $0.0021 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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