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pdf-sign

This skill should be used when the user asks to "sign this PDF", "fill in this form", "add my signature to", or mentions signing letters, claim forms, or contracts. Overlays a signature image, ticks checkboxes, and fills date/name/phone fields on scanned or digital PDFs using pymupdf, with OCR fallback for scanned documents.

73

Quality

90%

Does it follow best practices?

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SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Quality

Content

88%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A tight, highly actionable single-file skill with executable code, a useful gotchas table, and a workflow that includes render-and-verify validation with an iterate-until-correct loop. Structure is good, though all content lives inline with no external references.

Suggestions

Move the gotchas table and/or the full recipe into a references/ file (e.g. RECIPE.md) to push progressive_disclosure toward the top anchor while keeping SKILL.md a lean overview.

Trim advisory prose such as 'A scanned signature (dark ink on white) works best' and the pen-color rationale to tighten conciseness further.

DimensionReasoningScore

Conciseness

The body is dense and assumes Claude's competence (no 'what is a PDF' padding), with a high-value gotchas table, but includes a few advisory prose lines ('A scanned signature (dark ink on white) works best', 'Blue-ish ink ... reads as pen') that could be trimmed.

4 / 5

Actionability

Provides fully executable, copy-paste-ready code for signature transparency conversion, the pymupdf recipe (insert_image/insert_text), OCR textpage fallback, plus exact setup commands — covering the common signature/date/checkbox cases.

5 / 5

Workflow Clarity

Sequenced workflow with an explicit validation/feedback loop — 'Render pages → view the PNGs → verify placement' then 'Iterate until correct' — and a hard rule to never overwrite the source, satisfying the destructive-operation validation requirement.

5 / 5

Progressive Disclosure

Well-organized into clear sections (Signature image, Setup, Approach, Recipe, Gotchas, Workflow) with no nested references, but the ~100-line body is entirely inline with no bundle files; a moderately sized skill like this could split the recipe/gotchas into a reference.

4 / 5

Total

18

/

20

Passed

Description

92%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong description that concretely states capabilities and gives natural, explicit trigger phrases for both what and when. Only minor gap is the absence of file-extension/synonym terms like '.pdf' or 'PDFs'.

Suggestions

Add '.pdf' / 'PDFs' and a synonym like 'e-sign' to the trigger terms to fully satisfy the top trigger-term anchor.

Consider rephrasing 'This skill should be used when the user asks to' into a tighter 'Use when ...' clause for parity with the strongest reference examples.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — 'Overlays a signature image, ticks checkboxes, and fills date/name/phone fields ... with OCR fallback' — giving comprehensive coverage of the signing task rather than vague language.

5 / 5

Completeness

Explicitly answers both what ('Overlays a signature image, ticks checkboxes, and fills date/name/phone fields ... using pymupdf, with OCR fallback') and when ('This skill should be used when the user asks to ...'), with concrete trigger phrases.

5 / 5

Trigger Term Quality

Includes highly natural trigger phrases users would say ('sign this PDF', 'fill in this form', 'add my signature to', letters/claim forms/contracts), but omits synonyms and the .pdf file extension that the top anchor expects.

4 / 5

Distinctiveness Conflict Risk

Occupies a clear niche (PDF signing/form-filling) with distinct triggers — signature overlay, claim forms, contracts — making conflict with unrelated skills unlikely.

5 / 5

Total

19

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
dwmkerr/claude-toolkit
Reviewed

Table of Contents

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