dsh-cost-governor

Cost governance & budget enforcement for DeepSeek Harness.

A finance-grade "cost governor" layered on top of DSH's built-in token metering: it turns the harness's already-disjoint token buckets (input / output / cache-read / cache-write / reasoning) into money, then enforces a budget — soft warn → hard ceiling → block or steer to a cheaper model — with a polished in-app dashboard.

Not another "cost counter". The counter exists (dsh-token-meter). This plugin is the budget keeper that says how much you're spending, what it will cost by month-end, and stops you when you told it to.

Why this one

Features

• Per-model cost accounting on the official sessionProjections seam — stays correct through compaction and cold reads, and re-prices history instantly when you edit a price.
• Multi-provider price catalog (DeepSeek, OpenAI, Anthropic, Google, xAI, Qwen, GLM, Moonshot) with separate cache-read/write and reasoning rates. Fully overridable.
• Budget governance: daily | weekly | monthly | unlimited budget, warnRatio soft threshold, hardRatio ceiling, and a hardAction of notify-only | block-new-requests | steer-to-cheaper-model.
• Webhook notifications (Slack-style / Feishu / DingTalk) on threshold crossings — fail-soft.
• Dashboard (Settings → Usage & Cost): KPI cards, animated budget bar, per-model spend table, daily chart, savings tip, CSV export.
• Compact HUD budget ring for the sidebar rail.

Install

# 1. install the plugin
npm i -g dsh-cost-governor          # or add it to your project

# 2. add to your DSH composition (cordis.yml)

- name: dsh-cost-governor
  config:
    currency: USD
    budget:
      period: monthly
      budgetUsd: 20
      warnRatio: 0.8
      hardRatio: 1.0
      hardAction: notify-only      # notify-only | block-new-requests | steer-to-cheaper-model
    notifyWebhook: ""              # optional

# 3. restart dsh — the dashboard appears under Settings → Usage & Cost

Configuration

Architecture

client dashboard / HUD
        ▲  session/projection frames + settings scope
host   UsageCost service ── BudgetGovernor · CostLedger · Notifier
        ▲  ctx.sessionProjections.register(costUsage)
costUsage projection   (pure fold: raw per-model token buckets)
        ▲  reuses core token buckets (request/context → model attribution)
dsh-token-meter · dsh-llm (TokenUsage)

The costUsage projection stores raw token buckets only — never currency — so it is replay-safe and a price-table edit re-prices history without refolding the log.

Development

pnpm install
pnpm build          # tsc (see PUBLISHING.md for the full DSH toolchain notes)

Open preview/dashboard.html for a zero-build visual preview of the dashboard.

Limitations

• Only final assistant/message usage is billed; input spend of a request that fails before assembling a message is not captured (a provider still charges it). This matches the harness's own usage-carrier semantics and is a documented edge, not a miscount.
• block-new-requests / steer-to-cheaper-model are exposed as a governance gate (BudgetGovernor.gate) and emitted events; wiring them into the LLM waterfall is the one integration point to verify against the official DSH plugin docs at first build.
• Prices in the built-in catalog are community placeholders — verify against each provider before trusting absolute dollar figures.

License

MIT