@deepseek-ai/dsh-tool-doc

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Model-facing document tools: read, create and edit PDF / DOCX / XLSX / PPTX / CSV / Markdown files without shelling out to external utilities.

What it does

Registers three tools on ctx.tools:

• read_document(file_path) — reads PDF (text layer, page by page), DOCX (mammoth), XLSX (every sheet, cell values), PPTX (per-slide text), CSV (delimiter-sniffed, quote-aware) and plain text (md/txt/yaml/json/log). Output is bounded by maxTextChars (default 200,000) with an explicit truncation notice. Scanned/image-only PDFs yield no text.
• create_document(file_path, content) — creates a NEW file; the target must not exist (createIfAbsent semantics — use edit_document to change an existing file). DOCX/PDF take Markdown-lite text (#/##/### headings, - bullets) plus title and (DOCX) tables; XLSX takes sheets; CSV takes rows; md/txt take plain text. PDF embeds a system CJK font when one is discoverable (cjkFontPath config overrides the search).
• edit_document(file_path, operations) — applies ordered literal edits in place. DOCX: replace_text (inside single text runs, count defaults to 1, 'all' replaces every match) and append_paragraph. XLSX: set_cell / append_rows / add_sheet (1-based addressing; sheet omitted means the first sheet). CSV: set_cell / append_rows. Operations validate up front; a rejected op aborts the call before any write.

Legacy binary .doc / .xls / .ppt files are not supported — the tools ask the user to convert them first. PPTX is read-only.

Filesystem seam

Text formats (csv/md/txt/…) read and write through the governed ctx.fs seam, so sandbox policy, approval flows and observation events apply as with the native read/write tools. Binary formats read through ctx.fs.readBytes (capped by readMaxBytes, default 50 MB) but write to the resolved process path with node:fs, because the seam is text-only; sandbox write policy does not fence those binary writes.

Configuration

All optional: maxTextChars (read text budget), readMaxBytes (binary read cap), cjkFontPath (explicit CJK font file for PDF creation — any fontkit-openable TTF/OTF/TTC).

Model Experience

Tool schema

The model sees one schema per tool with a precise per-format description; edit_document operations are a oneOf discriminated by a const op, so the model gets an exact contract for each edit kind.

Tool-call history and result

Read results carry a <path>/<kind>/<details>/<content> envelope (bounded text); create/edit results return a one-line acknowledgement with byte counts or per-op summary numbers. Errors are stable Chinese/English message strings describing the rejection (unsupported legacy format, target already exists, unknown worksheet, zero matches, …).

Known Limitations and Deferred Work

• PDF CJK fonts are discovered, not bundled — with no usable system font, CJK text falls back to the built-in Latin font (the create result reports it). The .ttc collection path extracts the first face to a temp TTF because pdfkit cannot embed collections.
• DOCX edits are paragraph-level — replace_text matches inside single <w:t> runs (text split across runs does not match); headers, footers, fields and numbering are out of edit scope.
• No in-place edits for PDF/PPTX/text — recreate with create_document instead.
• Legacy binary office formats unsupported — .doc/.xls/.ppt need a user-side conversion first.