# Feature Specification: Remove Legacy Graph Options

**Feature Branch**: `088-remove-tenant-graphoptions-legacy`  
**Created**: 2026-02-11  
**Status**: Draft  
**Input**: Remove the legacy tenant-based Graph options path and make provider-based resolution the only source of Graph configuration.

## Clarifications

### Session 2026-02-11

- Q: How should `Tenant::graphOptions()` be made unusable (kill-switch)? → A: Keep the method, but make it throw a clear exception so any remaining call sites fail fast in CI/runtime.
- Q: Should we drop legacy tenant credential DB fields as part of this feature? → A: No — defer DB schema cleanup to a follow-up feature.
- Q: Which pattern should the CI guardrail block? → A: Block any call to the deprecated tenant accessor (`$tenant->graphOptions()` and `Tenant::graphOptions()`), but do not block other unrelated `graphOptions(...)` methods.
- Q: Should the CI guardrail scan only production code, or also tests? → A: Scan `app/` only.

## User Scenarios & Testing *(mandatory)*

### User Story 1 - Safe Refactors via Single Credential Source (Priority: P1)

As a maintainer, I want all Microsoft Graph configuration to come from a single, canonical provider-based source, so refactors do not accidentally mix credential sources or introduce inconsistent authentication behavior.

**Why this priority**: This removes a major source of drift and breakage, making changes safer and predictable.

**Independent Test**: Can be fully tested by running the automated test suite and verifying that Graph configuration is resolved only via the canonical provider connection, with no tenant-stored credential fallback.

**Acceptance Scenarios**:

1. **Given** a tenant with a valid provider connection configured, **When** any Graph-enabled flow starts, **Then** it uses only the provider connection-derived configuration.
2. **Given** a tenant without a configured provider connection, **When** a Graph-enabled flow starts, **Then** the flow fails deterministically without using any tenant-stored credentials.

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### User Story 2 - Prevent Reintroduction of Legacy Paths (Priority: P2)

As a maintainer, I want an automated guardrail that fails CI if the deprecated tenant-based Graph options accessor is reintroduced, so the codebase cannot regress silently.

**Why this priority**: Prevents recurring tech debt and ensures the hard cut remains enforced.

**Independent Test**: Can be fully tested by introducing a deliberate reference in a sandbox change and confirming CI fails.

**Acceptance Scenarios**:

1. **Given** a change that reintroduces a usage of the deprecated tenant-based Graph options accessor, **When** tests run in CI, **Then** the pipeline fails with a clear message describing the forbidden pattern.

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### Edge Cases

- Tenants that previously relied on tenant-stored credentials must not silently keep working; they should fail clearly until a provider connection is configured.
- Flows that run non-interactively (jobs/scheduled work) must behave consistently with interactive flows: no alternate credential source.

## Requirements *(mandatory)*

### Assumptions

- The canonical source of truth for Microsoft Graph configuration is the provider connection resolved for the tenant (default provider key: `microsoft`).
- No user-facing navigation or UI changes are required.
- Provider connection resolution semantics remain unchanged.
- Dropping/altering deprecated tenant credential fields in the database is out of scope for this feature.

### Definitions

- **Provider configuration is “missing or invalid”** when `ProviderConnectionResolver::resolveDefault($tenant, 'microsoft')` results in a blocked resolution (e.g. missing default connection, disabled/needs consent, missing/invalid credentials).
- Downstream Microsoft Graph authentication / HTTP failures are still treated as runtime Graph errors; this feature only removes the legacy tenant-credential configuration path and standardizes option sourcing.

### Out of Scope

- Any database schema changes to remove deprecated tenant credential fields (follow-up feature).

### Functional Requirements

- **FR-001**: The system MUST not use the deprecated tenant-based Graph options accessor anywhere under `app/`.
- **FR-002**: The system MUST derive Microsoft Graph configuration exclusively from the canonical provider-based resolution for the tenant.
- **FR-003**: The system MUST NOT fallback to tenant-stored credentials if provider-based configuration is missing or invalid.
- **FR-004**: If provider-based configuration is missing or invalid (see Definitions), the system MUST fail fast with a clear, actionable error indicating that provider configuration is required.
- **FR-005**: The system MUST include an automated guardrail that fails CI if the deprecated tenant-based Graph options accessor is referenced in application code (instance or static): `$tenant->graphOptions()` or `Tenant::graphOptions()`.
- **FR-005a**: The guardrail MUST scan `app/` (production code) and SHOULD NOT fail due to references in `tests/`.
- **FR-006**: The deprecated tenant-based Graph options accessor MUST throw a clear exception if called (kill-switch), and MUST NOT attempt to resolve credentials from tenant-stored fields.

## Success Criteria *(mandatory)*

### Measurable Outcomes

- **SC-001**: CI includes a guardrail that reports 0 allowed references to the deprecated tenant-based Graph options accessor.
- **SC-002**: 100% of Graph-enabled flows use provider-based resolution as their configuration source.
- **SC-003**: The existing automated test suite passes without disabling tests or reducing coverage.
- **SC-004**: When provider configuration is missing, affected flows fail with a consistent, actionable error (no silent fallback behavior).