Fix Seer billing when natal chart context is missing

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What changed

• Vedic and Western Ask the Seer no longer debit PAYG credits (or consume the free tool-seer instance) when the natal chart payload is missing.
• The shared tool Seer gate now accepts missingContextError and returns 400 before rate-limit and consumeBillingAction.
• Added a unit test that a real question with no chart returns 400 and does not call billing.

Why this change is safe

• Root cause: enforceToolSeerGate billed first; /api/ask-vedic-seer and /api/ask-western-seer then 400’d for missing vedicChartData / westernChartData.
• Trigger: Signed-in PAYG user opens Ask the Vedic Seer before a chart exists (the tab is shown whenever the user is signed in), submits a real question. UI already mapped that 400 to “Generate your Vedic chart with birth time…” after the debit.
• Scope is the gate plus those two natal routes. Other tool Seers are unchanged. Complementary to open PR Fix Seer billing for empty questions #59 (empty-question debit), not a duplicate.
• Auth still runs first (401 before missing-context 400).

Verification

• pnpm exec eslint on touched files (0 errors)
• pnpm test — 69 suites / 382 tests passed
• pnpm run lint:security passed
• Playwright smoke not required (API billing gate only; no UI/routing change)

Regression prevention

• tests/unit/enforceToolSeerGate.test.ts — missing chart context → 400 and consumeBillingAction not called; valid questions still bill; injection blocks still skip debit.
• Existing empty-question pass-through behavior in the gate is unchanged (still covered by open Fix Seer billing for empty questions #59).

Release checklist (solo-friendly)

• CI is green
• Ready to merge to main
• Post-merge: ask Vedic Seer before generating a chart — should 400 with no credit change

  

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Project	Deployment	Actions	Updated (UTC)
future-seer	Ready	Preview	Aug 31, 2026 11:13am