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docs: agent platform architecture plan — augmentation + task breakdown (#173) 
Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>
2026-03-16 01:28:29 +00:00

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Mission Scratchpad — MVP

Append-only log. NEVER delete entries. NEVER overwrite sections. This is the orchestrator's working memory across sessions.

Original Mission Prompt

Active mission detected: MVP. Read the mission state files and report status.
User confirmed: start the planning gate.

Planning Decisions

2026-03-13 — Milestone and task breakdown

  • PRD defines 8 phases (Phase 0–7), mapped 1:1 to Gitea milestones
  • 59 issues created on git.mosaicstack.dev/mosaic/mosaic-stack (#1–#59)
  • Each phase has a verification task as the final issue
  • Task IDs use P{phase}-{seq} format (P0-001 through P7-008)
  • Repo created as mosaic/mosaic-stack (private) on Gitea
  • Milestones: ms-157 (Phase 0) through ms-164 (Phase 7)
  • Total: 59 tasks across 8 milestones

Phase structure

Phase Version Tasks Focus
0 v0.0.1 9 Foundation — monorepo, types, db, auth, OTEL, Docker, CI
1 v0.0.2 9 Core API — gateway, brain, queue, routes, WebSocket
2 v0.0.3 7 Agent Layer — Pi SDK, multi-provider, routing, coord
3 v0.0.4 8 Web Dashboard — Next.js, chat, tasks, projects, admin
4 v0.0.5 7 Memory & Intelligence — memory, log, summarization, skills
5 v0.0.6 5 Remote Control — Discord, Telegram, SSO
6 v0.0.7 6 CLI & Tools — CLI, prdy, quality-rails, installer, TUI
7 v0.1.0 8 Polish & Beta — MCP, providers, E2E, docs, release

Session Log

Session Date Milestone Tasks Done Outcome
1 2026-03-13 Planning Planning gate Milestones created, 59 issues created, TASKS.md populated, manifest updated
2 2026-03-13 Vertical slice P1-001, P1-007, P1-008, P2-001, P5-002, P6-005 Communication spine built and merged (PR #61). Gateway + TUI + Discord. 3-agent gatekeeper review, 10/16 issues remediated, 4 deferred.
3 2026-03-13 Foundation P0-002, P0-005, P0-006 Foundation layer merged (PR #65). Docker Compose (PG+pgvector, Valkey, OTEL Collector, Jaeger), OTEL auto-instrumentation in gateway, @mosaic/types with DTOs + Socket.IO typed event maps.

Session 4 — Docker Compose fix

Session Date Milestone Tasks Done Outcome
4 2026-03-12 Foundation (fix) Fixed Jaeger tag (2→2.6.0), remapped PG/Valkey ports (5433/6380) to avoid host conflicts. PR #66 merged to main.

Verification evidence:

  • All 4 containers healthy (PG, Valkey, OTEL Collector, Jaeger)
  • OTEL pipeline proven: mosaic-gateway service visible in Jaeger UI
  • Gateway traces flow through Collector → Jaeger

Session 5 — Phase 0-1 completion

Session Date Milestone Tasks Done Outcome
5 2026-03-12 Phase 0, Phase 1 P0-003, P0-004, P0-007, P0-008, P0-009, P1-002–P1-006, P1-009 Foundation + Core API complete. DB, auth, CI, brain, queue, CRUD routes all merged and green.

Session 6 — Phase 2 agent layer

Session Date Milestone Tasks Done Outcome
6 2026-03-12 Phase 2 P2-002, P2-003, P2-004, P2-005, P2-006, FIX-01 Multi-provider routing, tool registration, coord migration, session management, dispose() fix. PRs #74–#78.

Session 7-8 — Phase 2 verification + completion

Session Date Milestone Tasks Done Outcome
7-8 2026-03-12 Phase 2 P2-007 19 unit tests (routing + coord). PR #79 merged, issue #25 closed. Phase 2 complete.

Session 11 — Phase 5 completion

Session Date Milestone Tasks Done Outcome
11 2026-03-14 Phase 5 P5-005 Wired Telegram plugin into gateway (was stubbed). Updated .env.example with all P5 env vars. PR #99 merged, issue #45 closed. Phase 5 complete.

Findings during verification:

  • Telegram plugin was built but not wired into gateway (stub warning in plugin.module.ts)
  • Discord plugin was fully wired
  • SSO/Authentik OIDC adapter was fully wired
  • All three quality gates passing

Session 11 (continued) — Phase 6 completion

Session Date Milestone Tasks Done Outcome
11 2026-03-14 Phase 6 P6-002, P6-003, P6-004, P6-001, P6-006 Full CLI & Tools migration. PRs #100-#104 merged. Also fixed 2 gateway startup bugs (PR #102). Phase 6 complete.

Phase 6 details:

  • P6-002: @mosaic/prdy migrated from v0 (~400 LOC). PR #101.
  • P6-003: @mosaic/quality-rails migrated from v0 (~500 LOC). PR #100.
  • P6-004: @mosaic/mosaic wizard migrated from v0 (2272 LOC, 28 files). PR #103.
  • P6-001: CLI subcommands wired — tui, prdy, quality-rails, wizard all working. PR #104.
  • BUG-1: PLUGIN_REGISTRY circular import fixed via plugin.tokens.ts. PR #102.
  • BUG-2: AuthStorage.create() → .inMemory() to prevent silent exit. PR #102.

Session 11 (continued) — E2E testing + bug fixes + Phase 7 rescope

Bug fixes merged during E2E testing (PRs #107-#117):

  • CI: from_secret syntax for Woodpecker v2 (#107)
  • Gateway: dotenv loading from monorepo root (#108)
  • Gateway: missing @Inject() decorators causing silent hang (#109)
  • Gateway: CORS + memory userId + pgvector auto-init (#110)
  • Auth: BetterAuth trustedOrigins for web dashboard (#111)
  • Auth: CORS headers on raw BetterAuth HTTP handler (#112)
  • Husky: removed deprecated v9 shim lines (#113)
  • CLI: login command + authenticated TUI sessions (#114)
  • CLI: Origin header on auth requests (#115)
  • Agent: Ollama provider registration with openai-completions API (#116, #117)

E2E testing results:

  • Web UI: login works, projects list, chats list (but chat doesn't function)
  • TUI: authenticated connection works, agent responds via Ollama llama3.2
  • Agent tools: brain, coord, memory tools confirmed working
  • Gateway: all routes mapped, providers register correctly

Phase 7 rescoped (Jason directed):

  • Phase 7 renamed from "Polish & Beta" to "Feature Completion (v0.0.8)"
  • Added 13 new tasks (P7-009 through P7-021): web UI, agent tools, CLI, coord architecture
  • P7-002 (extra SSO), P7-003 (extra LLM), P7-005 (perf), P7-008 (v0.1.0 tag) moved to Phase 8
  • Phase 8 added as "Polish & Beta (v0.1.0)"
  • Reason: platform isn't feature-complete enough for beta — web UI is scaffolded but non-functional for real use, agent tooling is minimal, CLI needs model switching

Open Questions

(none at this time)

Corrections

2026-03-13 — Vertical slice reorder (Jason directed)

Original plan: Linear Phase 0 → 1 → 2 → ... execution.

Correction: Vertical slice first. Scaffold monorepo, then build the Pi TUI → Gateway → Discord communication spine end-to-end before backfilling auth, brain, memory, CRUD, etc.

Why: Validate the architecture's core message flow before investing in horizontal layers. If the communication channels don't work, nothing else matters.

Revised execution sequence:

Step Tasks (cross-phase) What it proves
1 P0-001: Scaffold monorepo Build system works
2 P0-005: Docker Compose (PG + Valkey) Infrastructure runs
3 P0-002: @mosaic/types (minimal — gateway, agent, chat types) Shared contracts
4 P1-001: Gateway scaffold (minimal NestJS + Fastify) API surface boots
5 P1-007: WebSocket server (chat streaming) Real-time channel works
6 P1-008: Basic agent dispatch (single provider) LLM responds
7 P2-001: @mosaic/agent — Pi SDK integration (minimal) Pi sessions work
8 P6-005: Pi TUI integration (mosaic tui → gateway) TUI ↔ Gateway proven
9 P5-001: Plugin host (channel plugin interface) Plugin arch works
10 P5-002: Discord plugin (bot + channel) Discord ↔ Gateway proven
— Then backfill: auth, brain, db, queue, OTEL, CI, web dashboard, etc.

Session 9 — Phase 3 Web Dashboard (P3-001 through P3-007)

Session Date Milestone Tasks Done Outcome
9 2026-03-12 Phase 3 P3-001 through P3-007 Full web dashboard: Next.js 16 scaffold, auth pages, chat UI, tasks (list+kanban), projects, settings, admin. PRs #82-#89 merged.

Session 10 — Phase 3 verification (P3-008)

Session Date Milestone Tasks Done Outcome
10 2026-03-13 Phase 3 P3-008 Phase 3 verification: typecheck 18/18, lint 18/18, format clean, build green (10 routes), 10 tests pass. Phase 3 complete.

Session 10 (continued) — Phase 4 Memory & Intelligence

Session Date Milestone Tasks Done Outcome
10 2026-03-13 Phase 4 P4-001 through P4-007 Full memory + log system: DB schema (preferences, insights w/ pgvector, agent_logs, skills, summarization_jobs), @mosaic/memory + @mosaic/log packages, embedding service, summarization pipeline w/ cron, memory tools in agent sessions, skill management CRUD. All gates green.

Session 12 — Phase 7 planning + execution start

Session Date Milestone Tasks Done Outcome
12 2026-03-15 Phase 7 Planning Merged rescope PR #119. Created 15 Gitea issues (#120-#134) for P7-009 through P7-021 + FIX-02/FIX-03. Planned 10-wave execution order with 2-worker parallelism.

Phase 7 execution plan (10 waves, max 2 parallel workers):

Wave Task A Task B
1 P7-009 Web chat WS (#120) P7-001 MCP hardening (#52)
2 P7-010 Conversation mgmt (#121) P7-015 Agent tools (#126)
3 P7-011 Project views (#122) P7-016 MCP client (#127)
4 P7-012 Provider UI (#123) P7-017 Skill invocation (#128)
5 P7-013 Settings persist (#124) P7-018 CLI model switch (#129)
6 P7-014 Admin panel (#125) P7-019 CLI sessions (#130)
7 P7-020 Coord DB (#131) —
8 FIX-02 TUI state (#133) FIX-03 Agent sandbox (#134)
9 P7-004 E2E Playwright (#55) P7-006 Docs (#57) + P7-007 Deploy docs (#58)
10 P7-021 Verify Phase 7 (#132) —

Session 12 — Phase 7 completion summary

All 17 Phase 7 tasks + 2 backlog fixes completed in a single session.

PRs merged: #136, #137, #138, #139, #140, #141, #142, #143, #144, #145, #146, #147, #148, #149, #150, #151, #152, #153 Issues closed: #52, #55, #57, #58, #120-#134

Verification evidence:

  • Typecheck: 32/32 tasks green
  • Lint: 18/18 packages green
  • Format: All files clean
  • 19 PRs squash-merged to main, all quality gates passed

Phase 7 delivered:

  • Web: functional chat (WS streaming), conversation management, project detail views, provider UI, settings persistence, admin panel
  • Agent: 7 new tools (file/git/shell/web), MCP server (14 tools), MCP client (external server bridge), skill invocation
  • CLI: model/provider switching, session management
  • Infrastructure: coord DB migration, agent sandbox hardening
  • Quality: E2E Playwright suite (~35 tests), comprehensive docs (user/admin/dev/deployment)
  • Fixes: TUI state updater, agent session sandboxing

Session 13 — CLI Command Architecture (P8-005, P8-006)

Session Date Milestone Tasks Done Outcome
13 2026-03-15 Phase 8 P8-005, P8-006 CLI command architecture implemented. DB schema, brain repo, gateway endpoints, CLI commands. PR #158 merged.

Changes delivered:

  • DB: Extended agents table (projectId, ownerId, systemPrompt, allowedTools, skills, isSystem). Added agentId to conversations.
  • Brain: New agents repository with findAccessible (owner's + system agents).
  • Gateway: /api/agents CRUD, consolidated /api/missions with user-scoped CRUD + /tasks sub-routes, coord slimmed to file-based only, agentConfigId wired into session creation.
  • CLI: mosaic agent (--list, --new, --show, --update, --delete), mosaic mission (--list, --init, --plan, --update, task subcommand), mosaic prdy (gateway-aware), shared with-auth + select-dialog utilities.
  • TUI: --agent and --project flags, agent name display in top bar, agentId in socket payload.
  • Types: agentId added to ChatMessagePayload.
  • Tests: 23/23 gateway tests pass (updated ownership test for user-scoped missions).

Session 14 — Platform Architecture Plan Augmentation + Task Breakdown

Session Date Milestone Tasks Done Outcome
14 2026-03-15 Phase 8 P8-018 Augmented plan, created 13 issues, created Phase 8 milestone.

Decisions made:

  • This plan is Phase 7 feature extension work, not Phase 8 beta scope. P8-001–P8-004 (SSO, LLM, perf, release gate) are deferred to far future.
  • /provider OAuth in TUI: URL-to-clipboard + Valkey poll token pattern (same as Pi agent)
  • Add mutable column to preferences now (P8-007 DB migration)
  • Teams architecture: teams + team_members tables, teamId/ownerType on projects. Workspace path branches on owner type: users/<uid>/ vs teams/<tid>/.
  • Phase dependency chain decided: Wave 1 (DB+Types) → Wave 2 (TUI+toolhardening) → Wave 3 (gateway registry, gating) → Wave 4 (prefs+commands) → Wave 5 (reload+GC) → Wave 6 (workspaces) → Wave 7 (autocomplete) → Wave 8 (verify).

Plan augmentations added:

  • Teams Architecture section (DB schema, workspace paths, RBAC)
  • REST Route Specifications table
  • /provider OAuth flow (URL+clipboard+polling)
  • Preferences mutable migration spec
  • Test Strategy (per-task test files + key test cases)
  • Phase Execution Order (dependency graph + wave plan)

Issues created: #160–#172 (Gitea milestone ms-165) P8-018 closed: Spin-off stubs created (gatekeeper-service.md, task-queue-unification.md, chroot-sandboxing.md)

Next: Begin execution at Wave 1 — P8-007 (DB migrations) + P8-008 (Types) in parallel.

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