synapbus/examples/doc-gardener

doc-gardener

End-to-end demo of the dynamic agent spawning feature (spec 018-dynamic-agent-spawning).

A human owner defines a high-level goal ("verify docs.mcpproxy.app against the mcpproxy source code"). A pre-built coordinator meta-agent decomposes the goal into a task tree, proposes spawning specialist sub-agents with capped autonomy, the specialists claim tasks and produce artifacts, and a rich HTML report is generated from the run.

This example exercises the feature's data primitives end-to-end: goal creation with a backing channel, task-tree materialization with denormalized ancestry, config_hash-rooted trust, delegation-cap enforcement, atomic task claim, append-only reputation ledger, cost rollup, HTML rendering from DB state.

Status of the MVP demo

Piece	Status
Goal creation + backing channel	✅ real
Task tree materialization (ancestry snapshots)	✅ real
Atomic optimistic-lock task claim	✅ real (covered by 50-goroutine race test in internal/goaltasks/)
Config-hash computation (deterministic, sensitive to capability changes)	✅ real (tested in internal/trust/)
Delegation cap enforcement (child ≤ parent)	✅ real (tested in internal/trust/)
Append-only reputation ledger with 70 %-of-parent seed and exponential decay	✅ real (tested in internal/trust/)
Cost rollup via recursive CTE	✅ real (tested in internal/goaltasks/)
Rich HTML report (goal / tree / agents / costs / timeline)	✅ real
Secret encryption + scoped env injection	✅ real (internal/secrets/, tested)
Coordinator driven by a real LLM	❌ deferred — the demo's coordinator logic lives in Go (cmd/docgardener/flow.go); the LLM-in-the-loop path needs MCP tool wiring + reactor integration
Specialist subprocess runs via the harness	❌ deferred — the demo produces synthetic artifacts
Full MCP tool surface (create_goal, propose_task_tree, propose_agent, claim_task, verify_task, request_resource, list_resources)	❌ contracts live in specs/018-dynamic-agent-spawning/contracts/mcp-tools.md; wiring is deferred
Svelte /goals UI	❌ deferred

See specs/018-dynamic-agent-spawning/tasks.md for the full phase breakdown and what remains.

Prereqs

• Go 1.25+
• sqlite3, curl on $PATH
• A free TCP port (default 18089)

Run it

./start.sh            # build + launch synapbus on port 18089
./run_task.sh         # execute the demo flow
./report.sh           # render report.html
./stop.sh             # shut down synapbus

run_task.sh can be re-run any number of times against a running instance — each invocation creates a new goal + task tree + reputation evidence, all appended to the ledger.

What happens under the hood

./run_task.sh invokes ./bin/docgardener run which:

1. Bootstraps: creates user algis (password algis-demo-pw), creates the approvals and requests channels, and materializes the pre-built coordinator agent (doc-gardener-coordinator) with its config_hash computed from its system prompt and tool scope.
2. Creates a goal via goals.Service.CreateGoal — slug keep-docs-mcpproxy-app-accurate-against-source, budget $50.00, max_spawn_depth=3. Auto-creates the #goal-... backing channel.
3. Decomposes the goal into a 4-node task tree (root + scan-docs + verify-cli + drift-report leaves) via goaltasks.Service.CreateTree, which denormalizes the full ancestry onto each child task in a single transaction.
4. Spawns specialists — three agents (docs-scanner, cli-verifier, drift-reporter), each one running through trust.DelegationCap() to verify its proposed grant does not exceed the coordinator's, then computing a deterministic trust.ConfigHash(...) and seeding its reputation ledger at 70 % of the parent's rolling score via trust.Ledger.SeedFromParent().
5. Atomically claims tasks — each specialist invokes goaltasks.Service.Claim() which runs the optimistic-lock UPDATE ... WHERE assignee_agent_id IS NULL AND status='approved' pattern. A concurrent-claim race test in internal/goaltasks/service_test.go verifies exactly-one-winner over 50 goroutine rounds.
6. Runs specialists — simulated for the v1 demo. Each task:
   • transitions claimed → in_progress → awaiting_verification → done
   • increments leaf spend (tokens, dollars_cents)
   • posts an artifact message (#finding, #verified, #summary) to the goal channel with metadata.kind="artifact"
   • appends a positive evidence row to the reputation ledger with score_delta=+0.15 (auto verifier) or +0.2 (command verifier)
7. Marks the goal completed.

./report.sh then invokes ./bin/docgardener report, which:

1. reads the goal id from .last_goal_id
2. queries all tasks, agents, reputation, messages, billing codes for that goal
3. computes rolling reputation via trust.Ledger.RollingScore() (exponential decay, half_life_days=30)
4. builds a recursive task tree + a chronological timeline
5. renders report.html.tmpl into report.html
6. opens it in the default browser

Inspect during / after the run

• Web UI: http://localhost:18089 — log in as algis / algis-demo-pw. The existing channels, messages, and agents views all work on the new data.
• DB shell:

  sqlite3 ./data/synapbus.db -header -column "
    SELECT id, title, status, spent_dollars_cents, assignee_agent_id FROM goal_tasks;
  "
  

• Trust ledger:

  sqlite3 ./data/synapbus.db -header -column "
    SELECT substr(config_hash,1,12) AS hash, score_delta, evidence_ref, created_at
      FROM reputation_evidence ORDER BY created_at;
  "
  

• Cost rollup:

  sqlite3 ./data/synapbus.db -header -column "
    SELECT COALESCE(billing_code,''), SUM(spent_tokens), SUM(spent_dollars_cents)
      FROM goal_tasks GROUP BY billing_code;
  "
  

Expected HTML report

report.html contains six sections:

1. Header — goal title, status, budget, owner, backing channel
2. Spend metrics — total dollars / tokens / agents spawned
3. Goal description
4. Task tree — recursive, collapsible, status badges, per-task spend, verifier kind
5. Spawned agents — each with name, config_hash (first 12 chars), parent agent, spawn depth, autonomy tier, rolling reputation bar, tool-scope chips, truncated system prompt
6. Cost breakdown by billing code — per-code task count, tokens, dollars
7. Artifacts posted by specialists — the raw #finding, #verified, #summary messages
8. Timeline — every message in the goal channel, chronologically, annotated with actor and kind

Screenshot-equivalent output (minus images):

Doc-gardener run — Keep docs.mcpproxy.app accurate against source
Goal #4 · slug keep-docs-... · owner algis · backing channel #goal-... · [completed]

Spend         Tokens        Agents spawned
$1.05         6000          4

Task tree
├─ Verify docs.mcpproxy.app against source         [approved]
│  ├─ Scan docs for CLI flags                      [done] $0.45 · 1500 tok · auto
│  ├─ Verify flags exist in mcpproxy binary        [done] $0.25 · 2000 tok · auto
│  └─ Produce drift report                         [done] $0.35 · 2500 tok · command

Spawned agents
  • Doc-gardener Coordinator   config_hash 70a9a06e9595…  root · assisted · rep 80%
  • Docs Scanner               config_hash a0b5c6538b2d…  parent=coordinator · depth 1 · assisted · rep 58%
  • CLI Verifier               config_hash 47c6839eed73…  parent=coordinator · depth 1 · assisted · rep 58%
  • Drift Reporter             config_hash ceaa7816aa42…  parent=coordinator · depth 1 · assisted · rep 59%

Cost breakdown
  doc-gardener            1 task    0 tok  $0.00
  doc-gardener/report     1 task 2500 tok  $0.35
  doc-gardener/scan       1 task 1500 tok  $0.45
  doc-gardener/verify     1 task 2000 tok  $0.25

Tests for the primitives

The feature ships with passing test suites for every critical invariant:

go test ./internal/goals/... ./internal/goaltasks/... ./internal/trust/... ./internal/secrets/...

• internal/goaltasks/service_test.go
  • TestCreateTree_AncestryAndDepth — recursive tree build with correct depth + ancestry
  • TestCreateTree_AncestryOverflow — 16 KB cap enforcement
  • TestClaimAtomic_Race — 50 rounds × 2 racing goroutines, exactly one winner per round
  • TestRollupCosts — recursive CTE over 4-level tree
  • TestTransition_StateMachine — legal and illegal transitions
• internal/trust/config_hash_test.go — determinism under shuffled inputs, sensitivity to capability changes
• internal/trust/delegation_test.go — full tier-matrix + tool-scope subset enforcement
• internal/trust/ledger_test.go — exponential decay, 70%-of-parent seed, clamping
• internal/secrets/store_test.go — NaCl roundtrip, scope precedence, name sanitization

Troubleshooting

Symptom	Fix
./start.sh fails at "admin socket never appeared"	Another instance on port 18089 — set SYNAPBUS_PORT=18090 ./start.sh
./run_task.sh fails with "DB not found"	./start.sh hasn't run — run it first
Report page is empty or missing sections	.last_goal_id is stale — rerun ./run_task.sh then ./report.sh
Stale binary	rm -rf bin && ./start.sh — forces rebuild

Next steps (out of scope for this MVP)

The spec at specs/018-dynamic-agent-spawning/ lays out what comes after this demo, including the full MCP tool surface, reactor integration for real subprocess runs, the Svelte /goals page, the resource-request protocol, quarantine on low reputation, and the LLM-driven coordinator. This example establishes that the foundational primitives work; the follow-up work layers on top.