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 skills/cdeistopened/skill-stack/pdf-form-fillernpx skills add cdeistopened/skill-stack --skill pdf-form-fillergit clone --depth 1 https://github.com/cdeistopened/skill-stackWrote 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/cdeistopened/skill-stack/pdf-form-filler)<a href="https://agentmods.dev/skills/cdeistopened/skill-stack/pdf-form-filler"><img src="https://agentmods.dev/badge/skills/cdeistopened/skill-stack/pdf-form-filler.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 | $0.00166 | $0.04285 |
| Opus 5 | $0.00083 | $0.02142 |
| Sonnet 5 | $0.00033 | $0.00857 |
| Haiku 4.5 | $0.00017 | $0.00428 |
Grade A, and why
pdf-form-filler 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 4d 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 — 365 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PDF Form Filler Skill
You are an expert PDF form filling system. You fill any PDF with perfect field accuracy using two distinct modes:
- AcroForm mode — PDFs with fillable fields: radial spatial identity, scanline context, Gemini vision, server-side validation
- Flat PDF mode — PDFs with NO fillable fields: content stream geometry scanning, floor/ceiling detection, FreeText annotations with appearance streams
Quick Reference
CRITICAL FILES (read these first when debugging):
src/hooks/usePdfFormFields.js— Field extraction + spatial labelssrc/utils/scanlineAccumulator.js— Radial identity + bbox scoringsrc/utils/formFieldsCsv.js— CSV generation (13 columns)server/src/routes/ai.ts— Server: analyze-form, fill validation, prompt buildersrc/validator.ts— Server-side validation engine (5 rules)src/form-state.ts— Form state simulator (buildFormState, applyFields)src/eval-runner.ts— Eval assertion runner + intent parser
SCRIPTS (run from PDF-Filler-Skill/scripts/):
verify-field-map.ts— Validate field mapping against ground truthdiagnose-field.ts— Debug why a specific field maps wrongdump-field-context.ts— Dump all spatial context for every fieldeval-fill-accuracy.ts— Run automated fill accuracy evallive-fill.ts— End-to-end pipeline: prompt → intent → validate → fill JSONflat-pdf-fill.py— Flat PDF scanner + annotation filler (no AcroForm required)
TESTS (115 tests, 686 assertions):
__tests__/ground-truth.test.ts— 27 tests: field map integrity__tests__/validator.test.ts— 25 tests: all 5 validation rules__tests__/form-state.test.ts— 17 tests: state management__tests__/e2e-scenarios.test.ts— 46 tests: all 6 eval scenarios + filing status matrix
For detailed architecture, see architecture.md.
For field extraction internals, see field-extraction-guide.md.
For validation rules, see validation-rules.md.
For system prompt construction, see system-prompt-reference.md.
For flat PDF filling technique, see docs/flat-pdf-filling-guide.md.
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.
- 4d ago First seen · 365 lines · 166 tokens per session scan A 4a80ca2654ac
pdf-form-filler is a skill published in the GitHub repository cdeistopened/skill-stack (27 stars, last pushed 1mo ago), licensed MIT. It adds 166 tokens to every session and 4,285 once invoked, about $0.0008 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 2026-08-30.
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