dsh-tool-somark

A DeepSeek Harness plugin that gives the model a somark_parse tool: parse PDFs, images, Word, and PowerPoint files into structure-preserving Markdown and JSON through the SoMark document-parsing API, with page and token counts.

The document read goes through ctx.fs, so any mounted filesystem policy applies to the read. Parsed content is returned as data and must never be executed.

Install

# from npm (once published)
dsh plugin --profile <name> add dsh-tool-somark

# from a tarball
dsh plugin --profile <name> add ./dsh-tool-somark-0.1.0.tgz

# from git (requires the package's `prepare` build; see the harness docs)
dsh plugin --profile <name> add github:you/dsh-tool-somark

Then boot the profile; the somark_parse tool registers automatically. The plugin is also usable as a plain library dependency for programmatic parsing (src/client.ts exports the API client).

Requirements

• A DeepSeek Harness profile with the base bundle (@deepseek-ai/dsh-base), which provides ctx.tools and ctx.fs.
• A SoMark API key. Set SOMARK_API_KEY in the environment or configure apiKey below. SoMark is an external paid service and receives the uploaded document contents.

Config

All fields optional; defaults apply when omitted.

Field	Default	Meaning
apiKey	unset	SoMark API key $SOMARK_API_KEY Empty → the tool errors at execution.
baseURL	https://somark.tech/api/v1	API base; /parse/async and /parse/async_check append.
outputFormats	['markdown', 'json']	Formats requested when a call omits outputFormats.
elementFormats	{ image: 'url', formula: 'latex', table: 'html', cs: 'image' }	Partial per-element rendering-format overrides.
featureConfig	cross-page off, inline image / table image / image understanding on, header-footer off	Partial feature-switch overrides.
pollIntervalMs	2000	Delay between status polls.
maxPollAttempts	1000	Maximum polls (≈ 33 minutes at the default interval).
maxFileBytes	209715200	Upload cap; SoMark documents a 200 MB limit.
markdownCapChars	200000	Inclusive cap on the markdown characters returned in one result.
jsonCapChars	200000	Inclusive cap on the stringified JSON characters returned in one result.

Example profile patch (cordis.patch.yml in the profile, or a --patch overlay):

- id: tool-somark
  config:
    apiKey: 'sk-…'

Invalid element/feature/output-format values fail the plugin load with a CONFIG_INVALID error rather than being silently accepted.

The tool

somark_parse takes a required path (absolute path to the document) and an optional outputFormats array. It returns the parsed Markdown (capped by markdownCapChars, flagged truncated), the page/token counts, and the structured JSON when requested and within jsonCapChars (otherwise flagged jsonOmitted).

Failures carry machine-routable codes on the tool result: NO_API_KEY, DOCUMENT_NOT_FOUND, DOCUMENT_NOT_A_FILE, UNSUPPORTED_EXTENSION, FILE_TOO_LARGE, CONFIG_INVALID, SUBMIT_FAILED, TASK_FAILED, POLL_TIMEOUT, ABORTED, REQUEST_FAILED, INVALID_RESPONSE.

Development

pnpm install
pnpm test        # vitest (79 tests, 100% src coverage)
pnpm build       # tsc → lib/
pnpm pack        # tarball for dsh plugin add

Known Limitations and Deferred Work

• No batch/directory parsing — one path per call; callers loop the tool.
• Element and feature formats are deployment config, not per-call arguments.
• No artifact persistence — the result returns content; consumers can persist via tool/result.
• Oversized JSON is omitted (jsonOmitted), not spilled.

License

MIT