docs(11-02): complete agent signature bake-in prepare pipeline plan
- 11-02-SUMMARY.md: preparePdf() embeds agent PNG + prepare route 422 guard - STATE.md: advance to plan 2 of 3, add phase 11-02 decisions, update metrics - ROADMAP.md: phase 11 progress updated (2/3 plans complete) - REQUIREMENTS.md: AGENT-04 marked complete
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Chandler Copeland
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---
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phase: 11-agent-saved-signature-and-signing-workflow
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plan: "02"
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subsystem: pdf
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tags: [pdf-lib, agent-signature, prepare-pipeline, drizzle-orm]
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# Dependency graph
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requires:
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- phase: 11-01
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provides: agentSignatureData column on users table; agent-signature field type in FieldPlacer
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provides:
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- preparePdf() embeds agent PNG at agent-signature field coordinates via pdfDoc.embedPng + page.drawImage
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- prepare route fetches agentSignatureData from DB and passes to preparePdf()
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- 422 guard when agent-signature fields present but no signature saved
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affects: [phase-12-preview, phase-13-ai-field-placement]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [embed-once-draw-many for PDFImage reuse across field loop; 422 guard before preparePdf for missing agent signature]
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key-files:
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created: []
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modified:
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- teressa-copeland-homes/src/lib/pdf/prepare-document.ts
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- teressa-copeland-homes/src/app/api/documents/[id]/prepare/route.ts
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key-decisions:
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- "PDFImage embedded once before field loop and reused across all agent-sig fields — matches plan guidance, avoids repeated embed cost"
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- "Session guard strengthened to !session?.user?.id in prepare route — matches established pattern from agent/signature route; fixes TypeScript narrowing"
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- "422 guard fires only when agent-sig fields exist AND no signature is saved — documents with no agent-sig fields prepare normally"
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patterns-established:
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- "embed-once-draw-many: call pdfDoc.embedPng() once before field loop, store PDFImage, reuse in drawImage calls inside loop"
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- "422-before-prepare: validate preconditions (agent sig present) before calling preparePdf() to prevent silent no-ops"
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requirements-completed: [AGENT-04]
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# Metrics
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duration: 2min
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completed: 2026-03-21
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---
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# Phase 11 Plan 02: Agent Signature Bake-In Summary
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**preparePdf() embeds agent PNG at agent-signature field coordinates using pdfDoc.embedPng + page.drawImage; prepare route fetches agentSignatureData from DB with a 422 guard when fields exist but no signature is saved**
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## Performance
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- **Duration:** ~2 min
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- **Started:** 2026-03-21T20:05:41Z
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- **Completed:** 2026-03-21T20:07:05Z
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- **Tasks:** 2
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- **Files modified:** 2
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## Accomplishments
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- `preparePdf()` gains optional 5th parameter `agentSignatureData: string | null = null`; agent-signature stub replaced with real `page.drawImage()` call using field.x/y/width/height
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- `PDFImage` imported from `@cantoo/pdf-lib`; image embedded once before field loop and reused across all agent-sig fields
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- Prepare route fetches `agentSignatureData` from `users` table for the authenticated session; passes it as 5th arg to `preparePdf()`
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- 422 guard with `{ error: 'agent-signature-missing' }` fires when any `agent-signature` field exists but no signature has been saved
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: preparePdf() — add agentSignatureData param and embed at agent-sig field coordinates** - `d9652e1` (feat)
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2. **Task 2: prepare route — fetch agentSignatureData, 422 guard, pass to preparePdf** - `b2e9810` (feat)
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## Files Created/Modified
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- `teressa-copeland-homes/src/lib/pdf/prepare-document.ts` - Added `agentSignatureData` param, `PDFImage` import, embed-once-draw-many block, replaced agent-signature stub with `drawImage`
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- `teressa-copeland-homes/src/app/api/documents/[id]/prepare/route.ts` - Added `users`/`getFieldType` imports, strengthened session guard, DB fetch, 422 guard, 5-arg `preparePdf()` call
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## Decisions Made
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- PDFImage embedded once before field loop and reused — avoids re-embedding cost per field and matches plan guidance
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- Session guard strengthened from `!session` to `!session?.user?.id` — required for TypeScript narrowing so `session.user.id` is a `string` (not `string | undefined`) when passed to `eq()`
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- 422 guard fires only when `hasAgentSigFields && !agentSignatureData` — documents with no agent-signature fields prepare normally, preserving backward compatibility
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Strengthened session guard to enable TypeScript narrowing**
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- **Found during:** Task 2 (prepare route — fetch agentSignatureData, 422 guard, pass to preparePdf)
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- **Issue:** Original `if (!session)` guard left `session.user` and `session.user.id` as possibly-undefined; TypeScript TS2769 + TS18048 errors when passing `session.user.id` to `eq(users.id, ...)`
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- **Fix:** Changed `if (!session)` to `if (!session?.user?.id)` — matches established pattern from `src/app/api/agent/signature/route.ts` (11-01)
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- **Files modified:** `teressa-copeland-homes/src/app/api/documents/[id]/prepare/route.ts`
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- **Verification:** `npx tsc --noEmit` passed with zero errors after fix
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- **Committed in:** `b2e9810` (part of Task 2 commit)
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---
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**Total deviations:** 1 auto-fixed (Rule 1 - type-narrowing bug in session guard)
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**Impact on plan:** Minimal — single-line guard change consistent with established codebase pattern. No scope creep.
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## Issues Encountered
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- TypeScript TS2769/TS18048 errors on `session.user.id` due to weaker session guard than established pattern. Resolved immediately by adopting `!session?.user?.id` guard (same as agent/signature route added in 11-01).
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- AGENT-04 complete: agent's saved PNG is baked into prepared PDFs before reaching the client
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- Client signing session unaffected — `isClientVisibleField()` already excludes `agent-signature` fields
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- Phase 12 (preview route) can proceed; Phase 13 (AI field placement) has no dependency on this plan
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- Functional verification (draw → save → prepare → download PDF and inspect embedded signature) is recommended before Phase 12
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---
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*Phase: 11-agent-saved-signature-and-signing-workflow*
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*Completed: 2026-03-21*
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