Claude-skill-registry document-types

Understand and work with mortgage document types and classification. Use when asking about document types, adding new document support, debugging classification, or understanding what DocType constants mean.

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/document-types" ~/.claude/skills/majiayu000-claude-skill-registry-document-types && rm -rf "$T"

manifest: skills/data/document-types/SKILL.md

Mortgage Document Types

Purpose

Work with document classification in the mortgage underwriting system.

Document Type Constants

Located in

internal/model/document.go

Income Documents

Constant	Description	Filename Patterns
`DocTypeW2`	W-2 wage statements	`w2` , `w-2`
`DocType1099`	1099 contractor income	`1099`
`DocTypePaystub`	Pay stubs/earnings	`paystub` , `pay_stub` , `pay-stub` , `earnings`
`DocTypeTaxReturn`	Tax returns (1040)	`tax` , `1040`
`DocTypeProfitLoss`	P&L statements	`profit` , `p&l` , `pnl`
`DocTypeEmploymentLetter`	Employment verification	`employment` , `verification`

Asset Documents

Constant	Description	Filename Patterns
`DocTypeBankStatement`	Bank statements	`bank`
`DocTypeAssetStatement`	General assets	`asset`
`DocTypeRetirementStmt`	401k/IRA statements	`retirement` , `401k` , `ira`
`DocTypeGiftLetter`	Gift fund letters	`gift`

Credit Documents

Constant Description Filename Patterns

DocTypeCreditReport

Credit bureau reports

*credit*

DocTypeDebtPayoff

Debt payoff letters

*payoff*

*debt*

Collateral Documents

Constant	Description	Filename Patterns
`DocTypeAppraisal`	Property appraisals	`appraisal`
`DocTypePurchaseContract`	Purchase agreements	`purchase` , `contract`
`DocTypeTitleReport`	Title reports	`title`
`DocTypePropertyInsurance`	Hazard insurance	`insurance` , `hazard` , `homeowner`

Type Inference Logic

Located in

internal/document/store.go

// Files are classified by checking if filename contains pattern
lower := strings.ToLower(filepath.Base(path))
for pattern, docType := range patterns {
    if strings.Contains(lower, pattern) {
        return docType
    }
}

Adding a New Document Type

Step 1: Add constant to

internal/model/document.go

const (
    // ... existing types ...
    DocTypeNewType DocumentType = "new_type"
)

Step 2: Add pattern to

internal/document/store.go

patterns := map[string]model.DocumentType{
    // ... existing patterns ...
    "new_pattern": model.DocTypeNewType,
}

Step 3: Add to agent's document lists

In the relevant agent (e.g.,

internal/agent/income/income.go

func (a *Agent) RequiredDocuments() []model.DocumentType {
    return []model.DocumentType{
        model.DocTypeW2,
        model.DocTypeNewType,  // Add here
    }
}

Step 4: Update prompts

Update the agent's prompt to describe how to handle the new document type.

Document Structure

type Document struct {
    ID            string            // Hash-based unique ID
    ApplicationID string            // Loan application ID
    Type          DocumentType      // One of the DocType* constants
    FileName      string            // Original filename
    MimeType      string            // application/pdf, image/png, etc.
    FilePath      string            // Local filesystem path
    GeminiURI     string            // Cached Gemini File API URI
    UploadedAt    time.Time
    BorrowerID    string
    Year          int               // Tax year for tax docs
    Period        string            // Pay period for paystubs
    Metadata      map[string]string // Additional metadata
}

Supported MIME Types

From

internal/document/store.go:MimeTypeFromExtension

```
.pdf
```
->
```
application/pdf
```
```
.png
```
->
```
image/png
```
```
.jpg
```
,
```
.jpeg
```
->
```
image/jpeg
```
```
.gif
```
->
```
image/gif
```
```
.webp
```
->
```
image/webp
```

Related Files

```
internal/model/document.go
```
- Type definitions
```
internal/document/store.go
```
- Loading and type inference
```
cmd/underwriter/main.go
```
- CLI type inference