prompts/claude.md

Claude (Anthropic)

• Runner: scripts/run_claude.py
• Result set: results/claude/<doc_id>.json
• Default model: claude-sonnet-4-6 (override with ANTHROPIC_MODEL)
• API: Anthropic Messages API (/v1/messages), anthropic-version: 2023-06-01
• Schema mode: anthropic_output_config_nullable_v1

Prompt

The user instruction is the canonical extraction_prompt.txt with one trailing sentence added, because Claude returns conversational text by default:

Extract the document into the supplied JSON schema. Use only information present in the
document. Return null for fields that are not printed or cannot be determined. Preserve
table rows as arrays and preserve the document language for values. Document id: {doc_id}.
Return only the JSON object, with no prose or markdown.

PDFs are sent as a base64 document block, images as image blocks, multipage TIFF as a sequence of PNG image blocks, and DOCX/XLSX/text formats as extracted plain text.

Output constraint

The normalized strict schema (shared with the GPT runner via normalize_output_schema) is passed as output_config.format of type json_schema. If the provider rejects the compiled grammar (for example a schema construct it cannot compile), the runner retries once with the schema embedded in the prompt instead and records schema_fallback: "prompt_json_schema" in meta. Code-fenced or prose-wrapped JSON is unwrapped before parsing.

Run knobs (environment)

• ANTHROPIC_API_KEY (required)
• ANTHROPIC_MODEL, ANTHROPIC_API_BASE, ANTHROPIC_MAX_TOKENS
• ANTHROPIC_INPUT_USD_PER_1M, ANTHROPIC_OUTPUT_USD_PER_1M (optional cost estimate)

Failure handling

Truncation (stop_reason of max_tokens), empty output, invalid JSON, and schema-validation failures are written as status: "failed" with data: {}.