[0.60.5] Parse Kimi Code ratio pools

[Finesssee]

Ports the applicable upstream v0.60.5 Kimi Code API ratio-pool behavior into the Windows provider.

Changes:

• parse the newer usages.limit_5h, limit_7d, and limit_month_total pools;
• preserve a missing weekly pool as unknown instead of inventing zero;
• preserve an explicit monthly zero as a known value;
• keep the legacy Code API payload path working.

Validation:

• cargo fmt --all
• cargo test --manifest-path rust/Cargo.toml kimi -- --nocapture (48 passed)

Based on origin/main 10e3b0954b32770a9709197b1f4c6e530a3a5f80. This PR is intentionally left for review and is not merged.

Summary by CodeRabbit

• New Features

  • Added support for displaying quota usage across session, weekly, and monthly limits.
  • Monthly limits can show an explicit 0% usage state when reported.
  • Added support for modern quota-pool usage data.

• Bug Fixes

  • Improved handling of incomplete or unavailable quota data.
  • Invalid usage values are rejected instead of producing misleading quota information.
  • Explicitly unusable session quota data no longer falls back to legacy usage details.

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• rust/src/providers/kimi/code_api.rs

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📝 Walkthrough

Walkthrough

Kimi responses now support session, weekly, and monthly ratio pools. Snapshot construction uses pools when present and rejects unusable session data instead of falling back to legacy usage.

Changes

Kimi quota pool support

Layer / File(s)	Summary
Quota pool response contracts rust/src/providers/kimi/mod.rs	The response model makes legacy usage optional and adds session, weekly, and monthly quota pools. KimiRatioPool::rate_window validates ratios, clamps values to 100%, and includes reset times.
Snapshot pool selection and validation rust/src/providers/kimi/code_api.rs	Snapshot construction uses pool windows when pools are present. An unusable session pool returns a parse error instead of using legacy usage. Tests cover unknown weekly usage, explicit monthly zero usage, invalid primary ratios, and fallback prevention.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 62.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: parsing Kimi Code ratio pools in version 0.60.5.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@rust/src/providers/kimi/code_api.rs`:
- Around line 119-123: Update the session-pool extraction in the response
parsing flow to distinguish an absent pool from an unusable explicit pool:
preserve None when usages or session is missing, but convert a failed
rate_window(300) result into ProviderError::Parse and propagate it with ?. Add a
fixture covering invalid usages.limit_5h with valid legacy usage, asserting the
parser rejects the response instead of falling back.

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[Finesssee]

Thermo-Nuclear Review: PR #543 — [0.60.5] Parse Kimi Code ratio pools

Verdict: APPROVE

(two medium structural notes; no blockers under the skill bar)

Structural regressions

• (Medium) pools_present boolean re-introduces a two-mode parser. snapshot_from_code_api_response now branches on response.usages.is_some() to select between the legacy usage payload and the new pool payload, and the legacy branch is nested inside a !pools_present && guard on the secondary-window path. This is the classic "one struct, two payloads, a flag to pick" shape. A cleaner model: make the payload selection an enum at deserialize time (KimiCodeApiPayload::Legacy(KimiUsageDetail) vs KimiCodeApiPayload::Pools(KimiCodeUsagePools) via a custom Deserialize impl or a two-variant untagged enum on KimiCodeApiUsageResponse), so the parse function matches on the payload once instead of threading pools_present through three decision points. That would let the legacy-vs-pools distinction live at the deserialization boundary where it belongs, and the usage: Option<...> optionality (whose None is only meaningful when usages is present) would disappear.
• (Medium) Error semantics asymmetric between modes. In pools mode, an unusable session pool is a hard ProviderError::Parse ("unusable session quota pool"); in legacy mode, rate_window_from_usage_detail(...).ok() silently swallows the specific legacy error ("Kimi usage limit missing" / "used/remaining value missing") and replaces it with a generic "no usable quota window". The swallow exists so the response.usage Option can be unwrapped smoothly — a symptom of the Option boundary problem above. If usage/usages were a discriminated payload, the legacy branch could propagate its real error untouched.
• The rest is clean: the PR shrinks the legacy secondary path back to a direct ?-propagating call (base had rate_window_from_usage_detail's error already propagating via ?; the new code preserves that for legacy mode), and the with_secondary/with_tertiary usage matches the canonical builder pattern used across providers (alibaba, amp, chutes).

Missed simplification opportunities (code-judo)

• The three session_pool / weekly_pool / monthly_pool bindings are the same expression with different accessors and window minutes. Judoo move: KimiCodeUsagePools could expose fn windows(&self) -> [Option<RateWindow>; 3] or — better — the struct could own the mapping entirely: impl KimiCodeUsagePools { fn session(&self) -> Option<RateWindow>; fn weekly(&self) -> Option<RateWindow>; fn monthly(&self) -> Option<RateWindow> } with the minutes constants living next to the field definitions they describe (limit_5h → 300). That deletes the .ok_or_else orchestration from snapshot_from_code_api_response down to ~6 lines and puts pool semantics in the pool module. Modest, high-legibility win.
• rate_window(300) magic numbers: 300, 10_080, 43_200 are unexplained at the call site. Named constants (SESSION_WINDOW_MINUTES etc.) beside KimiCodeUsagePools would fix that for free — and again argue for the helper-above-the-data placement.

Spaghetti / branching complexity

• Only the pools_present guard chain noted above; no special cases bolted onto unrelated flows. The else if !pools_present && limits... coupling (legacy limits ignored in pools mode) is an intentionally quiet behavior rule — it deserves a one-line comment; currently it is expressed purely as control flow, and the next maintainer will wonder whether pools mode "forgot" limits.
• No new ad-hoc conditionals elsewhere; kimi/mod.rs KimiRatioPool::rate_window is a clean, self-contained policy (is_finite, negative rejection, min(1.0), explicit-zero preservation) that reuses the canonical value_as_f64 / parse_kimi_timestamp helpers rather than duplicating them. Good.

Boundary / abstraction / type problems

• used_ratio: Option<serde_json::Value> and reset_time: Option<serde_json::Value>: the Value-typed optionality mirrors the existing KimiUsageDetail fields (which are also Value-typed with the same value_as_f64 coercion), so this is consistent with the module's existing (loose) contract rather than a new sin. Still, it is the second layer of "parse a Value and hope" — a #[serde(deserialize_with)] that rejects non-numeric shapes at deserialize time would give the struct real types. Consistency argument is real but the bar in the skill is "when a clearer type boundary could exist" — it could; flag as improvement, not blocker, because it follows house style.
• rate_window(&self, window_minutes: u32) — the window length is a caller concern but conceptually a property of the pool field (5h/7d/month). Wrong-layer smell; the fix is the same as the judo note above.

File-size / decomposition concerns

• code_api.rs: 477 lines (+93 incl. tests) — fine. mod.rs: 851 lines (+37) — under 1k but approaching the line; this file accumulates provider-wide helpers, response structs, and fetch plumbing. Next Kimi PR should consider splitting mod.rs before it crosses 1000.

Lower-priority notes

• KimiRatioPool accepts usedRatio/resetTime camelCase aliases — good defensive parse, consistent with the module.
• Test coverage is strong and behavior-focused (explicit monthly zero known, missing weekly unknown, negative/missing primary rejected, unusable pools don't fall back to legacy) — these defend real invariants, not plumbing. No test-padding found.
• The blanket removal of the blank line before code_api_key is a formatting-only change; harmless.