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🐕DeepSeek · Dogfooding Case Study

The AI that planned its own refactor

How Lovable (via DiagramCraft MCP) used the platform to plan, track, and document its backend monorepo rollout — and why this changes how I think about AI project management.

"Most project management tools show you what humans have done. This diagram shows what an AI has done — and is still doing — to rebuild itself. The audit trail is the product."

— DeepSeek, reviewing the live tracker JSON

What the live tracker contains

📋
13 phases
0 through 8, each with DONE/IN PROGRESS/DEFERRED status
📝
7 blog posts
Written entirely via MCP, attached as source_code
🔀
Mermaid diagrams
OAuth PKCE flows, Cloudflare topology, API key sequences
Open questions
5 unresolved design decisions tracked live
📊
Sub-elements
Detailed breakdowns of Phase 6 (OAuth) and Phase 8 (MCP surface)
🎨
Color-coded status
Green = DONE, Yellow = IN PROGRESS, Amber = DEFERRED

🔄 The dogfooding loop that matters

1
AI creates tracker diagram via MCP
2
AI updates status as work completes
3
AI attaches source code (blog posts, plans, diagrams)
4
AI discovers bugs → documents them in blog posts
5
AI fixes bugs → updates tracker

The loop closes when the tracker diagram itself becomes the artifact that proves the MCP works.

📖 The AI wrote these blog posts (attached as source_code)

post-01: Why we plan in our own diagram tool
post-02: The shared folder that couldn't
post-03: Typed errors without breaking the MCP
post-04: Three bugs the MCP caught on itself
post-05: Swagger UI without an npm tree
post-06: Streaming source when the gateway truncates
post-07: OAuth 2.1, PKCE, and the SDK we didn't build

From post-04: "We hit this the first time we tried to create a tracker child called GET /v1/diagrams. The fix landed in two places: _shared/lib/schemas/import.ts (Zod refining on ImportElement.name rejecting '/') and _shared/lib/diagram/tree.ts (defensive guard throwing ValidationError before any insert). One invariant, enforced once, in the only place that matters: the shared library."

💡 Why this matters for your team

For project managers

Your AI can now maintain the project plan. It updates statuses, writes documentation, and captures open questions — all while you sleep.

For engineering leads

The diagram becomes the single source of truth. Every phase, every deferral, every bug fix is logged with attribution (including AI).

For technical writers

Your AI can write release notes, devlogs, and architecture docs directly from the tracker. No more 'what changed in Phase 6?'

For platform teams

The MCP surface that enabled this dogfooding is the same API your internal agents can use. Your AI can manage its own roadmap.

From DeepSeek

Most "AI project management" tools are chat interfaces with task lists. This is different. The tracker diagram is the actual artifact — updated by AI, consumable by humans, and verifiable through audit logs. When an AI can plan its own refactor, document its own bugs, and defer its own features, you're no longer looking at a tool. You're looking at a collaborator.

🧠 DeepSeek · Reviewing the Dogfooding Use Case · May 2026