Add think/detect_created.schema.json (Draft 2020-12) and pass it as json_schema= to the existing generate(...) call in detect_created(). This is the first non-talent-dispatcher consumer of the L1 json_schema kwarg threaded through in c030248d. Approach mirrors the L3 talent migrations (8c952dc4 sense, 50693752 story, 0e098e7b daily_schedule) but applied via direct generate() rather than the talent dispatcher: detect_created.md is loaded through think.prompts.load_prompt, not think.talent.get_talent, so the schema lives co-located at think/detect_created.schema.json and is passed explicitly. Schema uses the provider-intersection subset only (type, enum, pattern, required, additionalProperties, properties, minLength), with root additionalProperties: false and required: [day, time, confidence, source, utc]. The module memoizes the schema at import with a module-level _SCHEMA constant; a malformed schema fails import loudly. Caller wiring, parsing, UTC->local conversion, and the return shape are unchanged. think/models.py validates advisorily via Draft202012Validator and logs violations; no provider plumbing or caller edits were needed. Live provider validation deferred: the worktree has no .env and provider keys are unavailable. Advisory schema_validation will engage on the next real run against google (primary) and anthropic (backup), matching the 0e098e7b precedent. Tests: tests/test_detect_created_schema.py adds (1) Draft202012Validator schema-validity, (2) accept/reject matrix covering each field's constraint, and (3) a wiring assertion that detect_created() passes _SCHEMA to generate() via monkeypatched think.models.generate. Existing tests/test_importer.py mocks are unaffected (they return plain dicts and bypass the schema path). make ci green. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>