plan: implementation plan for 005-hybrid-mcp-tools

3-phase plan: foundation (jsruntime, actions, pagination, CLI),
MCP rewrite (4 tools), website docs. Phase 1 runs in parallel.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/005-hybrid-mcp-tools/plan.md

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+# Implementation Plan: Hybrid MCP Tool Architecture
+
+## Phase 1 — Foundation (parallel, no cross-dependencies)
+
+### Task A: JS/TS Runtime Engine (`internal/jsruntime/`)
+Port goja-based runtime from `../mcpproxy-go/internal/jsruntime/`. Simplified for SynapBus:
+- `runtime.go` — Execute(code, opts) with sandbox, timeout, call bridge
+- `pool.go` — Reusable runtime pool for concurrent executions
+- `typescript.go` — esbuild type-stripping transpilation
+- `*_test.go` — Table-driven tests for all components
+- ToolCaller interface: `Call(ctx, actionName, args) (any, error)`
+
+### Task B: Action Registry + BM25 Search (`internal/actions/`)
+- `types.go` — Action struct (name, category, description, params, examples)
+- `registry.go` — Registry collecting all 23 action definitions with schemas
+- `search.go` — BM25 in-memory search over action docs
+- `*_test.go` — Tests for registry + search relevance
+- Each action definition maps to an existing service method
+
+### Task C: Pagination + Advanced Filtering
+Modify existing service layer (no new packages):
+- `messaging/options.go` — Add Offset, After, Before fields to ReadOptions + SearchOptions
+- `messaging/store.go` — Update SQL queries for offset pagination + total count + date filtering
+- `messaging/service.go` — Return PaginatedResult{Items, Total, Offset, Limit}
+- `channels/store.go` — Pagination for GetChannelMessages, ListChannels
+- `channels/service.go` — Propagate pagination
+- `channels/task_store.go` — Pagination for ListTasks
+- `agents/` — Pagination for DiscoverAgents/ListAgents
+- Schema migration if indices needed
+- Tests for all modified queries
+
+### Task D: CLI Subcommands
+Add to existing cobra CLI in `cmd/synapbus/admin.go`:
+- `synapbus webhook register|list|delete` — via admin Unix socket
+- `synapbus k8s register|list|delete` — via admin Unix socket
+- `synapbus attachments gc` — via admin Unix socket
+- Server-side: add admin socket handlers in `internal/admin/socket.go`
+- Wire webhook/k8s/attachment services into admin.Services struct
+- Tests
+
+## Phase 2 — MCP Rewrite (depends on A + B + C)
+
+### Task E: 4-Tool MCP Architecture (`internal/mcp/`)
+- Rewrite `server.go` constructor to accept jsruntime + action registry
+- New `tools_hybrid.go` — my_status, search, execute, send_message
+- Wire execute → jsruntime.Execute() with ToolCaller bridging to action registry
+- Wire search → actions.Registry.Search()
+- Wire send_message → merged DM + channel messaging
+- Remove old registrar files (tools.go handlers, channel_tools.go, swarm_tools.go, webhook_tools.go, tools_attachments.go)
+- Keep: server.go (modified), auth.go, connection.go, health.go
+- Update main.go constructor call
+- Comprehensive tests
+
+## Phase 3 — Documentation (depends on all)
+
+### Task F: Website Docs (`../synapbus-website/`)
+- Update MCP tools documentation (4 tools instead of 30)
+- Document execute code examples
+- Document CLI commands for admin operations
+- Update API reference