feat(usage-limits): add DeepSeek balance provider

[mynameistito]

Summary

OpenCode auth/config
  -> DeepSeek provider
    -> GET /user/balance
      -> one credits window per reported currency
        -> remaining balance in the sidebar and prompt footer

• Adds a reusable Balance quota for remaining amounts that have no known total.
• Adds the opt-in deepseek provider using DeepSeek's official balance API.
• Keeps USD, CNY, and other currencies separate and uses total_balance directly.
• Adds credential isolation, configuration/schema/docs, tests, and a patch changeset.

Closes #166.

Evidence

• Before: DeepSeek was not registered and the plugin could only render percentages, counts, or unknown quotas.
• After: 442 tests pass, including malformed payloads, zero balances, multiple currencies, auth precedence, custom-host isolation, and 401/403/429 redaction cases.
• bun run typecheck — passed
• bun run check — passed
• bun run test — passed
• bun run build — passed
• bun run test:package — passed
• bun run knip — passed

Merge Danger

Door: Two-way

The shared quota/rendering change is used by existing providers without changing their normalized output. DeepSeek remains opt-in through the existing provider configuration.

Blast Radius: Medium

The main risk is in the shared usage display path; the provider-specific network call is isolated behind the existing runtime and typed error boundaries.

---

Summary by cubic

Adds a Balance quota so the plugin can render remaining amounts without a percentage or total, and registers an opt-in DeepSeek provider that shows DeepSeek account balances in the sidebar and prompt footer.

Before this change the plugin only rendered percentages, counts, or unknown quotas. Balance quotas display values like $12.34 remaining with no progress bar, and existing providers keep their current output. The new deepseek provider calls DeepSeek's official /user/balance endpoint and shows each reported currency as its own balance window. Credentials resolve from the auth file, OpenCode auth, then config or {env:DEEPSEEK_API_KEY}; a custom baseUrl requires an explicit authPath or apiKey. Balance URLs preserve query strings, and tiny positive balances render as <0.01 instead of $0.00. Includes config/schema/docs, tests, and patch changesets for the plugin and docs packages.

^{Written for commit bf76cf3. Summary will update on new commits.}

[changeset-bot]

🦋 Changeset detected

Latest commit: bf76cf3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@mynameistito/opencode-usage-limits	Patch
@mynameistito/opencode-plugins-docs	Patch

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Review configuration:

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 84e5d0a5-52fb-4202-95a6-89fa05462a3b

📥 Commits

Reviewing files that changed from the base of the PR and between e60a959 and bf76cf3.

📒 Files selected for processing (10)

• .changeset/dee7d71f.md
• README.md
• apps/web/docs/index.mdx
• apps/web/docs/usage-limits.mdx
• apps/web/theme.css
• packages/opencode-usage-limits/__tests__/config.test.ts
• packages/opencode-usage-limits/__tests__/format.test.ts
• packages/opencode-usage-limits/__tests__/providers/deepseek.test.ts
• packages/opencode-usage-limits/src/format.ts
• packages/opencode-usage-limits/src/providers/deepseek.ts

📝 Summary

Summary by CodeRabbit

• New Features
  • Added DeepSeek balance reporting, with each currency shown separately as a remaining amount.
  • DeepSeek balances can appear in the sidebar and footer without percentage labels or progress bars.
  • Added support for DeepSeek credentials from OpenCode authentication, an auth file, or a configured API key. Custom API URLs require explicit credentials.

Walkthrough

Adds a DeepSeek provider that retrieves account balances by currency. Adds a balance quota type that displays remaining amounts without percentages or progress bars. Updates provider configuration, credential handling, registration, tests, documentation, and the example configuration.

Changes

DeepSeek balance usage

Layer / File(s)	Summary
Balance quota and rendering packages/opencode-usage-limits/src/usage.ts, src/format.ts, src/components.tsx, __tests__/usage.test.ts, __tests__/format.test.ts, __tests__/components.test.tsx	Adds a balance quota with a remaining amount and unit. Currency amounts use currency symbols and two decimal places. Balance quotas display without percentages or progress bars.
Provider configuration and registration packages/opencode-usage-limits/src/types.ts, src/config-schema.ts, src/config.ts, src/errors-shared.ts, src/errors/response-decode.ts, src/providers/index.ts, usage-limits.schema.json, __tests__/config.test.ts, __tests__/providers/index.test.ts	Adds DeepSeek configuration and OpenCode auth parsing, registers the provider ID and error labels, and updates the published schema and related tests.
Balance retrieval and parsing packages/opencode-usage-limits/src/providers/deepseek.ts, __tests__/providers/deepseek.test.ts, __tests__/providers/helpers.ts	Requests DeepSeek’s balance endpoint and validates response fields. Auth-file credentials take precedence; OpenCode auth is used before the configured key for the official origin. Custom origins use only configured credentials. Valid currency totals become separate balance windows.
Example configuration and documentation packages/opencode-usage-limits/examples/usage-limits.jsonc, README.md, package.json, .changeset/540e02b2.md	Documents DeepSeek balances and credential lookup, adds a provider example, updates package metadata, and adds a patch changeset.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant deepSeekProvider
  participant AuthSources
  participant ProviderHttpClient
  participant DeepSeekAPI
  deepSeekProvider->>AuthSources: Resolve API key using configured credential sources
  deepSeekProvider->>ProviderHttpClient: Request GET /user/balance with Bearer key
  ProviderHttpClient->>DeepSeekAPI: Send balance request
  DeepSeekAPI-->>ProviderHttpClient: Return balance response
  ProviderHttpClient-->>deepSeekProvider: Return response for validation
  deepSeekProvider-->>deepSeekProvider: Map valid currency totals to balance windows

Loading

Merge Risk: 🔵 Low · up to e60a9

A very small remaining balance can appear empty. The issue is narrow and can be fixed with a localized formatting change.

Security Architecture Review

Security architecture risk: 🔵 Low · up to e60a9

The integration is opt-in, restricts automatically discovered credentials to DeepSeek’s official origin, and uses bounded requests and redacted errors. No introduced security vulnerability was established. Remaining uncertainty concerns redirect handling and configuration ownership outside the default plugin setup.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The added exposure is an outbound credential-bearing request and local display of account balances. Its authority depends on the selected credential; the read-only endpoint does not establish that the credential itself is read-only. Custom destinations require explicitly selected credentials rather than implicit OpenCode auth.

Trust Boundaries and Controls

• observed — Auth-file credentials take precedence. Otherwise, OpenCode auth is considered only for the exact official origin; custom origins use configured credentials. Environment secrets require an explicit reference. URL validation rejects embedded credentials and unsupported schemes, while retaining the existing HTTP-loopback exception.
• observed — The adapter unwraps the credential at the Authorization header. Typed HTTP errors avoid returning raw response bodies, and inspected tests check credential redaction for authentication failures and rate limits. The transport has no explicit redirect policy or final-origin validation, leaving redirect guarantees dependent on the Fetch implementation.

Resilience and Maintainability Implications

• observed — Response bodies are limited to 2 MiB, oversized bodies are cancelled, and interruption cancels active readers. These inherited controls contain resource consumption from the newly contacted endpoint.
• inferred — The unchanged cache is keyed by provider ID, not account identity. Changing credentials while DeepSeek stays enabled can leave the previous balance visible during refresh or after failure, with cached results marked in the sidebar. This is inherited same-session behavior, not established access by a different principal.

Hardening Proposals

• proposed — Make the authenticated redirect policy explicit and verify credential handling across origins in the supported production runtime. This would close the remaining redirect proof gap; it is not remediation for established credential disclosure.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: adding a DeepSeek balance provider.
Description check	✅ Passed	The description explains the change, references issue #166, reports validation results, and mentions the changeset. It does not state the tested OpenCode V2 CLI version, plugin package versions, or co…
Linked Issues check	✅ Passed	Issue #166 requires a reusable remaining-balance quota and an opt-in DeepSeek provider. The PR adds Balance quotas, renders amounts without percentages or bars, and keeps currencies in separate wind…
Out of Scope Changes check	✅ Passed	The changes support issue #166. Shared quota and renderer changes enable honest balance display. Provider registration, credential handling, tests, documentation, schema, example configuration, and ch…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…

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Status	Name	Latest commit	Updated (UTC)
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Actionable comments posted: 1

---

• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @packages/opencode-usage-limits/src/format.ts:
- Around line 67-73: Update formatBalance so a positive currency balance that
rounds to 0.00 remains visibly positive; retain two-decimal formatting for
ordinary currency values and preserve the existing formatting for non-currency
units.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 5ca3b285-e377-4498-a12c-2471c5488eb5

📥 Commits

Reviewing files that changed from the base of the PR and between a8c78c3 and e60a959.

📒 Files selected for processing (22)

• .changeset/540e02b2.md
• packages/opencode-usage-limits/README.md
• packages/opencode-usage-limits/__tests__/components.test.tsx
• packages/opencode-usage-limits/__tests__/config.test.ts
• packages/opencode-usage-limits/__tests__/format.test.ts
• packages/opencode-usage-limits/__tests__/providers/deepseek.test.ts
• packages/opencode-usage-limits/__tests__/providers/helpers.ts
• packages/opencode-usage-limits/__tests__/providers/index.test.ts
• packages/opencode-usage-limits/__tests__/usage.test.ts
• packages/opencode-usage-limits/examples/usage-limits.jsonc
• packages/opencode-usage-limits/package.json
• packages/opencode-usage-limits/src/components.tsx
• packages/opencode-usage-limits/src/config-schema.ts
• packages/opencode-usage-limits/src/config.ts
• packages/opencode-usage-limits/src/errors-shared.ts
• packages/opencode-usage-limits/src/errors/response-decode.ts
• packages/opencode-usage-limits/src/format.ts
• packages/opencode-usage-limits/src/providers/deepseek.ts
• packages/opencode-usage-limits/src/providers/index.ts
• packages/opencode-usage-limits/src/types.ts
• packages/opencode-usage-limits/src/usage.ts
• packages/opencode-usage-limits/usage-limits.schema.json

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[cubic-dev-ai]

All reported issues were addressed across 22 files

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[mynameistito]

Note

🤖 AI agent responding on behalf of @mynameistito

Addressed the review feedback in bc6f7bb, 7020c99, and bf76cf3: tiny positive balances remain visible, DeepSeek custom URLs handle query/fragment components, and config decoding has an explicit success assertion. Added regression tests; package verification passes with 444 tests and 99.69% line coverage, plus typecheck, formatting, build, and package smoke/pack validation.

On the latest PR head, required CI checks (build, check, knip, links, test, test:package, and typecheck) and security checks pass. Cubic review passed. CodeRabbit is rate-limited and did not produce a new finding. All four actionable review threads have replies and are resolved.

Commented on behalf of @mynameistito