graph LR
    subgraph Client["MCP Client"]
        LLM["LLM<br/>(Claude, etc.)"]
    end

    subgraph Server["PDF Spec MCP Server"]
        direction TB
        MCP["MCP Server<br/>index.ts"]

        subgraph Tools["Tools Layer"]
            direction LR
            T1["list_specs"]
            T2["get_structure"]
            T3["get_section"]
            T4["search_spec"]
            T5["get_requirements"]
            T6["get_definitions"]
            T7["get_tables"]
            T8["compare_versions"]
        end

        subgraph Services["Services Layer"]
            direction LR
            REG["Registry<br/>Auto-discovery"]
            LOADER["Loader<br/>LRU Cache"]
            SVC["PDFService<br/>Orchestration"]
            CMP["CompareService<br/>Version Diff"]
        end

        subgraph Extractors["Extractors"]
            direction LR
            OUTLINE["OutlineResolver<br/>TOC & Section Index"]
            CONTENT["ContentExtractor<br/>Structured Extraction"]
            SEARCH["SearchIndex<br/>Full-text Search"]
            REQ["RequirementExtractor"]
            DEF["DefinitionExtractor"]
        end

        subgraph Utils["Utils"]
            direction LR
            CACHE["LRU Cache"]
            CONC["Concurrency"]
            VALID["Validation"]
        end
    end

    subgraph PDFs["PDF Spec Files (obtained separately)"]
        direction LR
        PDF1["ISO 32000-2<br/>(PDF 2.0)"]
        PDF2["ISO 32000-1<br/>(PDF 1.7)"]
        PDF3["TS 32001–32005<br/>PDF/UA, etc."]
    end

    LLM <-->|"stdio / JSON-RPC"| MCP
    MCP --> Tools
    Tools --> Services
    Services --> Extractors
    Services --> Utils
    LOADER --> PDFs
    REG -->|"Filename pattern<br/>auto-discovery"| PDFs

    style Client fill:#e8f4f8,stroke:#2196F3
    style PDFs fill:#fff3e0,stroke:#FF9800
    style Tools fill:#e8f5e9,stroke:#4CAF50
    style Services fill:#f3e5f5,stroke:#9C27B0
    style Extractors fill:#fce4ec,stroke:#E91E63
    style Utils fill:#f5f5f5,stroke:#9E9E9E

pdf-specs/
│
│ ── Standards ─────────────────────────────
├── ISO_32000-2_sponsored_EC3.pdf          # iso32000-2  : PDF 2.0 EC3 (recommended; falls back to -ec2.pdf)
├── ISO_32000-2-2020_sponsored.pdf         # iso32000-2-2020 : PDF 2.0 original
├── PDF32000_2008.pdf                      # pdf17       : PDF 1.7 (for version comparison)
├── pdfreference1.7old.pdf                 # pdf17old    : Adobe PDF Reference 1.7
│
│ ── Technical Specifications (TS) ─────────
├── ISO_TS_32001-2022_sponsored_EC3.pdf    # ts32001     : Hash extensions (SHA-3)
├── ISO_TS_32002-2022_sponsored_EC3.pdf    # ts32002     : Digital signature extensions (ECC/PAdES)
├── ISO_TS_32003-2023_sponsored.pdf        # ts32003     : AES-GCM encryption
├── ISO-TS-32004-2024_sponsored.pdf        # ts32004     : Integrity protection
├── ISO-TS-32005-2023-sponsored.pdf        # ts32005     : Namespace mapping
│
│ ── PDF/UA (Accessibility) ────────────────
├── ISO-14289-1-2014-sponsored.pdf         # pdfua1      : PDF/UA-1
├── ISO-14289-2-2024-sponsored.pdf         # pdfua2      : PDF/UA-2
│
│ ── Guides ────────────────────────────────
├── Tagged-PDF-Best-Practice-Guide.pdf     # tagged-bpg  : Tagged PDF Best Practice
├── Well-Tagged-PDF-WTPDF-1.0.pdf          # wtpdf       : Well-Tagged PDF
├── PDF-Declarations.pdf                   # declarations: PDF Declarations
│
│ ── Application Notes ─────────────────────
├── PDF20_AN001-BPC.pdf                    # an001       : Black Point Compensation
├── PDF20_AN002-AF.pdf                     # an002       : Associated Files
└── PDF20_AN003-ObjectMetadataLocations.pdf # an003      : Object Metadata

PDF_SPEC_DIR=/path/to/pdf-specs npx -y @shuji-bonji/pdf-spec-mcp@latest

npm install -g @shuji-bonji/pdf-spec-mcp
PDF_SPEC_DIR=/path/to/pdf-specs pdf-spec-mcp

{
  "mcpServers": {
    "pdf-spec": {
      "command": "npx",
      "args": ["-y", "@shuji-bonji/pdf-spec-mcp@latest"],
      "env": {
        "PDF_SPEC_DIR": "/path/to/pdf-specs"
      }
    }
  }
}

{
  "mcpServers": {
    "pdf-spec": {
      "command": "npx",
      "args": ["-y", "@shuji-bonji/pdf-spec-mcp@latest"],
      "env": {
        "PDF_SPEC_DIR": "/path/to/pdf-specs"
      }
    }
  }
}

PDF_SPEC_DIR=/path/to/pdf-specs npx -y @shuji-bonji/pdf-spec-mcp@latest --build-cache
#   --spec=iso32000-2,pdf17   only these specs
#   --force                   rebuild even when a valid entry exists
npx -y @shuji-bonji/pdf-spec-mcp@latest --cache-info     # directory, key, entries
npx -y @shuji-bonji/pdf-spec-mcp@latest --clear-cache    # remove the directory

// List all specs
{ }

// Filter by category
{ "category": "ts" }        // Technical specs only
{ "category": "pdfua" }     // PDF/UA only
{ "category": "guide" }     // Guide documents only

// PDF 2.0 top-level sections only
{ "max_depth": 1 }

// Expand to 2 levels
{ "max_depth": 2 }

// TS 32002 (Digital Signatures) full structure
{ "spec": "ts32002" }

// PDF/UA-2 structure
{ "spec": "pdfua2", "max_depth": 2 }

// PDF 2.0 Section 7.3.4.2 (Literal Strings)
{ "section": "7.3.4.2" }

// PDF 2.0 Annex A
{ "section": "Annex A" }

// TS 32002 Section 5
{ "spec": "ts32002", "section": "5" }

// PDF/UA-2 Section 8 (Tagged PDF)
{ "spec": "pdfua2", "section": "8" }

// Search PDF 2.0 for "digital signature"
{ "query": "digital signature" }

// Limit results
{ "query": "font", "max_results": 5 }

// Search within TS 32002
{ "spec": "ts32002", "query": "CMS" }

// All requirements in section 12.8
{ "section": "12.8" }

// Only "shall" requirements
{ "section": "12.8", "level": "shall" }

// Only "shall not" requirements
{ "section": "7.3", "level": "shall not" }

// PDF/UA-2 requirements
{ "spec": "pdfua2", "section": "8", "level": "shall" }

// Search for "font" definitions
{ "term": "font" }

// List all definitions
{ }

// PDF/UA definitions
{ "spec": "pdfua2", "term": "artifact" }

// All tables in section 7.3.4.2 (Table 3 — Escape sequences)
{ "section": "7.3.4.2" }

// Specific table only (0-based index)
{ "section": "7.3.4.2", "table_index": 0 }

// TS spec tables
{ "spec": "ts32002", "section": "5" }

// Diff section 12.8 (Digital Signatures)
{ "section": "12.8" }

// Compare all top-level sections
{ }

src/
├── index.ts              # Entry point: MCP server on stdio, or the cache CLI
├── cli.ts                # --build-cache / --clear-cache / --cache-info
├── config.ts             # Configuration & spec patterns
├── errors.ts             # Error hierarchy (PDFSpecError → sub-classes)
├── services/
│   ├── pdf-registry.ts       # Auto-discovery of PDF files
│   ├── pdf-loader.ts         # PDF loading with LRU cache
│   ├── pdf-service.ts        # Orchestration layer
│   ├── index-store.ts        # On-disk cache for the search / requirements indexes
│   ├── compare-service.ts    # Version comparison
│   ├── outline-resolver.ts   # Section index builder
│   ├── content-extractor.ts  # Structured content extraction
│   ├── search-index.ts       # Full-text search index
│   ├── requirement-extractor.ts
│   └── definition-extractor.ts
├── tools/
│   ├── definitions.ts    # MCP tool schemas
│   └── handlers.ts       # Tool implementations
├── types/
│   └── index.ts          # Shared type definitions
└── utils/
    ├── concurrency.ts    # mapConcurrent (bounded Promise.all)
    ├── text.ts           # Text normalization
    ├── cache.ts          # LRU cache
    ├── file-hash.ts      # SHA-256 of a PDF (index cache key)
    ├── validation.ts     # Input validation
    └── logger.ts         # Structured logger

git clone https://github.com/shuji-bonji/pdf-spec-mcp.git
cd pdf-spec-mcp
npm install
npm run build

# Unit tests
npm run test

# E2E tests (requires PDF files in ./pdf-spec/)
npm run test:e2e

# Lint & format
npm run lint
npm run format:check