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Fusion Agent b1893a63af FN-043: add canonical thinking levels for custom providers

Custom-provider models now expose the full thinking-level selector and faithfully transmit the selected effort.

- Register all canonical thinking levels and preserve provider-specific API dialects.
- Remove the redundant reasoning toggle and update provider status and settings documentation.
- Add dashboard, engine, and provider registration coverage for thinking-level behavior.
- Add a minor changeset for the published CLI package.

Files changed:
 .../fn-043-custom-provider-thinking-levels.md      |  7 ++
 docs/settings-reference.md                         |  2 +
 .../dashboard/app/api/settings/provider-status.ts  |  1 -
 .../app/components/CustomProviderForm.css          |  5 +-
 .../app/components/CustomProviderForm.tsx          | 18 ++---
 .../__tests__/CustomProviderForm.test.tsx          | 35 ++++++---
 ...r-model-routes-custom-provider-thinking.test.ts | 91 ++++++++++++++++++++++
 .../custom-provider-thinking-levels.test.ts        | 49 ++++++++++++
 .../custom-providers-openai-completions.test.ts    |  2 +-
 .../custom-providers-openai-responses.test.ts      |  3 +-
 .../src/__tests__/pi-create-fn-agent.test.ts       | 31 +++++++-
 .../src/__tests__/provider-registration.test.ts    | 20 ++++-
 .../engine/src/auth/custom-provider-registry.ts    | 14 +++-
 packages/engine/src/pi.ts                          |  9 ++-
 14 files changed, 251 insertions(+), 36 deletions(-)

Fusion-Task-Id: FN-043

Fusion-Task-Lineage: fdd3308a-d5bd-4f54-911a-226c2b46a927

Co-authored-by: Fusion <noreply@runfusion.ai>

2026-08-20 03:57:23 +00:00