red/.planning/phases/08-schema-foundation-and-signing-page-safety/08-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
08-schema-foundation-and-signing-page-safety	02	api	nextjs typescript drizzle signing security	phase plan provides 08-schema-foundation-and-signing-page-safety 01 SignatureFieldType discriminant, getFieldType(), isClientVisibleField() exported from schema.ts	Server-side agent-signature field filter in GET /api/sign/[token] response Type-guarded handleFieldClick in SigningPageClient — non-client-signature fields skip modal open handleSubmit completeness check counts only client-signature fields SigningProgressBar total reflects client-signature field count only	Phase 10 (initials field type) — handleFieldClick type-switch pattern ready for extension Phase 11 (agent signing) — server filter ensures agent-signature fields never reach client JSON	added patterns Defense-in-depth: server-side filter is primary protection; client-side type guard is secondary Type-switch pattern in handleFieldClick — getFieldType() !== 'client-signature' returns early; extensible for Phase 10 initials isClientVisibleField() as reusable predicate for .filter() on signatureFields arrays	created modified teressa-copeland-homes/src/app/api/sign/[token]/route.ts teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx	Server-side filter is the primary security boundary — client guards are defense-in-depth only; direct API callers (curl, DevTools) cannot see agent-signature coordinates POST handler in route.ts is intentionally untouched — signature embedding pipeline reads signatureFields from DB directly, not from client payload handleFieldClick dependency array includes signatureFields — required because callback now calls signatureFields.find() Phase 8 ships atomically: 08-01 schema + 08-02 boundary enforcement together; no intermediate state where type discriminant exists but filter is absent	Type-switch guard pattern: const field = signatureFields.find(f => f.id === fieldId); if (getFieldType(field) !== 'client-signature') return; — establishes extensible branch for Phase 10 Filter before JSON serialization: (doc.signatureFields ?? []).filter(isClientVisibleField) — server owns the boundary	FIELD-01	~10min (continuation from checkpoint)	2026-03-21

Phase 8 Plan 02: Signing Page Safety Summary

Server-side agent-signature filter in GET /api/sign/[token] and type-branching guards in SigningPageClient.tsx — Phase 8 safety gate ships atomically with 08-01 schema foundation

Performance

• Duration: ~10 min (continuation agent from human-verify checkpoint)
• Started: 2026-03-21 (resumed from checkpoint)
• Completed: 2026-03-21T17:54:22Z
• Tasks: 3 (Tasks 1 and 2 completed in prior session; Task 3 checkpoint approved and recorded)
• Files modified: 2

Accomplishments

• Added isClientVisibleField import and .filter(isClientVisibleField) to the GET /api/sign/[token] response, ensuring agent-signature field coordinates are never serialized to the client JSON response
• Added getFieldType import and type-branching guard to handleFieldClick in SigningPageClient — clicking a non-client-signature field overlay now returns early instead of opening the signature modal
• Fixed handleSubmit completeness check and SigningProgressBar total to count only client-signature fields, so agent-signature fields (never rendered) do not block submission or inflate the progress indicator
• Human verification checkpoint approved: TypeScript compiles clean, all guards confirmed, backward compatibility with v1.0 signing sessions verified

Task Commits

Each task was committed atomically:

1. Task 1: Add isClientVisibleField filter to GET /api/sign/[token] route - ea3365f (feat)
2. Task 2: Add type-branching guards to SigningPageClient.tsx - 06e477b (feat)
3. Task 3: Human verification of Phase 8 safety gate - 0db26db (docs — checkpoint approval)

Plan metadata: (committed with this SUMMARY)

Files Created/Modified

• teressa-copeland-homes/src/app/api/sign/[token]/route.ts - Added isClientVisibleField import; GET response now filters signatureFields to exclude agent-signature fields before JSON serialization
• teressa-copeland-homes/src/app/sign/[token]/_components/SigningPageClient.tsx - Added getFieldType import; handleFieldClick type guard; handleSubmit client-signature-only count; SigningProgressBar client-signature-only total

Decisions Made

• Server-side filter in route.ts is the primary security boundary. Client-side guard in SigningPageClient is defense-in-depth. A caller hitting GET /api/sign/[token] directly (curl, browser DevTools) sees only client-visible fields regardless of the client component.
• POST handler in route.ts intentionally untouched. The signature embedding pipeline reads signatureFields from the DB directly — not from any client payload — so no filter is needed or appropriate there.
• signatureFields added to handleFieldClick dependency array because the callback now calls signatureFields.find(). This is correct React hook semantics.
• Phase 8 ships as a single atomic unit: 08-01 exports the type helpers; 08-02 uses them at both enforcement boundaries. There is no valid intermediate state.

Deviations from Plan

None — plan executed exactly as written. Both auto-task changes matched the specified diffs precisely. Human verification checkpoint approved without issues.

Issues Encountered

None.

User Setup Required

None — no external service configuration required.

Next Phase Readiness

• Phase 8 is fully complete: schema foundation (08-01) and signing page safety (08-02) are both active
• Phase 9 (agent signature capture) can now proceed — the agent-signature field type is defined in schema.ts and the server filter will automatically exclude agent-signature fields from all client signing sessions
• Phase 10 (initials field type) is unblocked — the handleFieldClick type-switch pattern is established and ready for an else if (getFieldType(field) === 'initials') branch

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Phase: 08-schema-foundation-and-signing-page-safety Completed: 2026-03-21