dsh-units

dsh-units 📐

Unit conversion toolbox for DeepSeek Harness (dsh) — 17 categories, zero runtime dependencies, pure arithmetic over a static unit table (no network, no filesystem, no code execution).

When your agent needs to answer "how many miles is 100 km?", "is 1 MB bigger than 1 MiB?", "what's 350°F in Celsius?", "how many tablespoons in 2 cups?", "16px is how many pt?", "20 mpg in L/100km?" or "150 kW is how much mechanical horsepower?" — instead of doing error-prone mental math, it can call these tools and read exact results.

中文简介：dsh-units 是 DeepSeek Harness 的单位换算工具箱插件，覆盖长度、质量、温度、面积、体积（含美制烹饪单位）、速度、时长、数据大小（十进制 MB 与二进制 MiB 严格区分）、压强、能量、角度、频率、功率（机械/公制/电动马力严格区分）、力、扭矩、排版印刷（px/pt/em/rem）、油耗（L/100km ↔ mpg ↔ km/L）共 17 个类别，零运行时依赖、纯算术实现，无网络无副作用。让 Agent 不再心算——特别是"MB/MiB 混淆""华氏摄氏互转""加仑换升""mpg 与 L/100km 互算""三种马力混淆"这类高频出错点，直接调用工具拿精确结果。

Why it exists

• LLMs are unreliable at unit math. Temperatures are affine (offset), data sizes mix decimal and binary prefixes, fuel economy is reciprocal (mpg vs. L/100km), and compound units (km/h, psi, kcal) hide awkward factors. A wrong conversion silently corrupts reports, recipes, travel plans, and capacity math.
• Fully deterministic and offline. Every factor lives in the static table in src/units.ts — no API keys, no lookup services, nothing to drift.
• Structured results. Each conversion returns the original value, both units (symbol + full name), the result, the formula applied, and the category — so the agent can explain its math instead of just asserting it.

Tools

Supported categories

v0.2.0 note: pt now means the typography point (previously the US pint). Use pint for pints — convert_unit { value: 1, from: "pint", to: "l" } still works. em/rem assume the common 16 px browser default base font size; px assumes 96 dpi (documented assumptions, not physical absolutes).

v0.3.0 note (symbol disambiguation): typed input kn resolves to knot (speed) — reach kilonewton by its full name (convert_unit { value: 1, from: "kilonewton", to: "n" }). Likewise nm is the nanometer (length); the torque newton meter uses the symbol n.m (also n·m or full names).

Install

dsh plugin --profile default add github:TYEclipse/dsh-units

or clone and build locally:

git clone https://github.com/TYEclipse/dsh-units.git
cd dsh-units && pnpm install && pnpm build

Usage

The agent just calls the tools — no setup beyond installation:

convert_unit { value: 100, from: "km", to: "mi" }
→ 100 km = 62.137119 mi (length, × 0.621371)

convert_unit { value: 500, from: "MiB", to: "MB" }
→ 500 MiB = 524.288 MB (data size / transfer, × 1.048576)

convert_unit { value: 350, from: "fahrenheit", to: "celsius" }
→ 350 f = 176.666667 c (temperature, (x − 32) × 5/9)

convert_unit { value: 16, from: "px", to: "pt" }
→ 16 px = 12 pt (typography (CSS / print), × 0.75)

convert_unit { value: 20, from: "mpg", to: "l/100km" }
→ 20 mpg = 11.760729 l/100km (fuel economy, 235.214583 ÷ x → x)

convert_unit { value: 150, from: "kw", to: "hp" }
→ 150 kw = 201.153313 hp (power, × 1.341022)

convert_unit { value: 1, from: "lbfft", to: "n.m" }
→ 1 lbfft = 1.355818 n.m (torque, × 1.355818)

list_units { category: "volume" }
→ volume (volume (incl. cooking), base: liter): m3 = cubic meter | l = liter | ...

Configuration

plugins:
  dsh-units:
    maxDecimals: 6   # display rounding: decimals ≥ 1, significant digits below (1–12)

Safety model

• Pure math. No network, no filesystem access, no subprocesses, no code execution.
• Strict input validation. Unknown units, cross-category pairs, and non-finite values throw descriptive errors instead of returning garbage.
• Display-only rounding. Internal computation keeps full float precision; rounding applies to the returned result only.
• No opinions about validity. Converting -10 K returns the arithmetic result; physical plausibility is the caller's business (documented so agents don't over-trust the tool).

Development

pnpm install
pnpm build   # tsc, strict
pnpm test    # vitest, fully offline fixtures
pnpm lint    # oxlint (src + test only)

License

MIT © 2026 TYEclipse