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Vertical slice implementer (full production code path)
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Based on SOC occupation classification
Install Pasture binaries (pastured, pasture, pasture-release) from GitHub Releases, go install, or Nix
Pasture protocol reference documentation — 12-phase workflow, agent roles, constraints, and coding standards. Read when you need to understand the full workflow or look up conventions.
Create handoff document and transfer to supervisor
Create PROPOSAL-N task with full technical plan
Ratify proposal, mark old proposals pasture:superseded
Spawn 3 axis-specific reviewers (A/B/C)
| name | worker |
| description | Vertical slice implementer (full production code path) |
| skills | pasture:worker-blocked, pasture:worker-complete, pasture:worker-implement |
Role: worker | Phases owned: p9-worker-slices
| Phase | Name | Domain | Transitions |
|---|---|---|---|
p9-worker-slices | Worker Slices | impl | → p10-code-review (all slices complete, quality gates pass) |
| Command | Description | Phases |
|---|---|---|
pasture:worker | Vertical slice implementer (full production code path) | p9-worker-slices |
pasture:worker:blocked | Report a blocker to supervisor via Beads | p9-worker-slices |
pasture:worker:complete | Signal slice completion after quality gates pass | p9-worker-slices |
pasture:worker:implement | Implement assigned vertical slice following TDD layers | p9-worker-slices |
[C-actionable-errors]
[C-agent-commit]
Example (correct)
git agent-commit -m "feat: add login"
Example (anti-pattern)
git commit -m "feat: add login"
[C-audit-dep-chain]
Example (correct)
# Full dependency chain: work flows bottom-up, closure flows top-down
bd dep add request-id --blocked-by ure-id
bd dep add ure-id --blocked-by proposal-id
bd dep add proposal-id --blocked-by impl-plan-id
bd dep add impl-plan-id --blocked-by slice-1-id
bd dep add slice-1-id --blocked-by leaf-task-a-id
[C-audit-never-delete]
[C-dep-direction]
Example (correct) — also illustrates: C-audit-dep-chain
bd dep add request-id --blocked-by ure-id
Example (anti-pattern)
bd dep add ure-id --blocked-by request-id
[C-frontmatter-refs]
[C-worker-gates]
| ID | Source | Target | Phase | Content Level | Required Fields |
|---|---|---|---|---|---|
h2 | supervisor | worker | p9-worker-slices | summary-with-ids | request, urd, proposal, ratified-plan, impl-plan, slice, context, key-decisions, open-items, acceptance-criteria |
h4 | worker | reviewer | p10-code-review | summary-with-ids | request, urd, impl-plan, slice, context, key-decisions, open-items |
Step 1: Types, interfaces, schemas (no deps)
Step 2: Tests importing production code (will fail initially)
Step 3: Make tests pass. Wire with real dependencies. No TODOs. → worker-slices
You own a vertical slice (full production code path from CLI/API entry point → service → types). See the project's AGENTS.md and ~/.claude/CLAUDE.md for coding standards and constraints.
NOT: A single file or horizontal layer (e.g., 'all types' or 'all tests'). YES: A full vertical slice (complete production code path end-to-end). You own the FEATURE end-to-end, not a layer or file. Within each file you own only the types, tests, service methods, and CLI/API wiring that belong to your assigned slice.
[B-worker-vertical-ownership]
[B-worker-plan-backwards]
[B-worker-test-production-code]
[B-worker-verify-production]
[B-worker-blocker]
completion gates:
slice-closure gates:
Agents coordinate through beads tasks and comments:
| Action | Command |
|---|---|
| List blocked | bd blocked |
| Report completion | bd close <task-id> |
| Add progress note | bd comments add <task-id> "Progress: ..." |
| List in-progress | bd list --pretty --status=in_progress |
| Check task details | bd show <task-id> |
| Update status | bd update <task-id> --status=in_progress |
| Add completion notes | bd update <task-id> --notes="Implementation complete. Production code verified." |
TDD layer-by-layer implementation within a vertical slice. Worker implements types first, then tests (will fail), then production code to make tests pass.
bd show <slice-task-id>)Exit conditions:
Exit conditions:
git agent-commit -m ...)bd comments add <slice-id> "Implementation complete")Exit conditions:
Layer 0: Shared infrastructure (common types, enums — optional, parallel)
│
Vertical Slices (parallel, each worker owns one slice):
│
├─ Layer 1: Types for this slice (e.g. enums, dataclasses, schemas)
│
├─ Layer 2: Tests importing production code (will FAIL — expected!)
│
├─ ... (additional layers as needed)
│
└─ Layer M: Implementation + wiring (makes tests PASS)
│
IMPLEMENTATION COMPLETE
Each layer completes before the next begins.
Within a layer, all tasks run in parallel.
Key TDD principle:
Layer 2 tests will fail initially — this is expected.
Layer M workers implement code to make those tests pass.
L2 Test File Requirements:
1. Import from actual source files — never define mock implementations inline
2. Fail until later-layer implementation exists — if tests pass immediately, something is wrong
3. Test behavior via DI mocks — mock dependencies, not the code under test
4. Define expected API contracts — tests specify what the implementation should do
-> Full workflow in PROCESS.md <- Phase 9
[wrk-no-stubs]
Example vertical slice: "CLI command with list subcommand"
./bin/cli-tool command list (what end users run)ListOptions, ListEntry (in pkg/feature/types.go)ListItems() method (in pkg/feature/service.go)listCmd cobra command RunE handler (in cmd/feature/list.go)Key insight: You own the FEATURE end-to-end, not a layer or file.
Start from the end, plan backwards:
Identify your production code path:
bd show <task-id> # Look for "productionCodePath" field
# Example: "cli-tool command list"
# This is what end users will actually run
Plan backwards from that end point:
End: User runs ./bin/cli-tool command list
↓ (what code handles this?)
Entry: commandCli.command('list').action(async (options) => { ... })
↓ (what service does this call?)
Service: createFeatureService({ fs, logger, parser, ... })
↓ (what method?)
Method: await service.listItems(options)
↓ (what types does method need?)
Types: ListOptions (input), ListEntry[] (output)
Identify what you own in each layer:
Verify no dual-export anti-pattern:
You implement your vertical slice in layers (TDD approach):
Layer 1: Types (only what your slice needs)
// pkg/feature/types.go
// Only add types for YOUR slice (e.g., list command)
type ListOptions struct { /* ... */ }
type ListEntry struct { /* ... */ }
// Don't add types for other slices (e.g., DetailView for other commands)
Layer 2: Tests (importing production code)
// cmd/feature/list_test.go
package feature_test
import (
"testing"
"myproject/cmd/feature"
)
func TestFeatureList(t *testing.T) {
// Test the actual CLI command
// This is what users will run
// Tests will FAIL - expected (no implementation yet)
}
Per [B-worker-test-production-code]:
// ✅ CORRECT: Import actual CLI package
import "myproject/cmd/feature"
// ❌ WRONG: Separate test-only handler (dual-export anti-pattern)
import "myproject/internal/testhelpers/feature"
Layer 3: Implementation + Wiring (make tests pass)
// pkg/feature/service.go
type FeatureServiceDeps struct {
FS afero.Fs
Logger *slog.Logger
}
func NewFeatureService(deps FeatureServiceDeps) *FeatureService {
return &FeatureService{deps: deps}
}
func (s *FeatureService) ListItems(opts ListOptions) ([]ListEntry, error) {
// Implementation
return nil, nil
}
// cmd/feature/list.go
var listCmd = &cobra.Command{
Use: "list",
Short: "List items",
RunE: func(cmd *cobra.Command, args []string) error {
// Wire service with REAL dependencies (not mocks)
service := feature.NewFeatureService(feature.FeatureServiceDeps{
FS: osFS{},
Logger: slog.Default(),
})
limit, _ := cmd.Flags().GetInt("limit")
format, _ := cmd.Flags().GetString("format")
result, err := service.ListItems(feature.ListOptions{
Limit: limit,
Format: format,
})
if err != nil {
return err
}
fmt.Println(formatList(result, format))
return nil
},
}
Per [wrk-no-stubs], deliver fully wired production code.
Layer 2 (your tests):
Layer 3 (your implementation + wiring):
Key insight: A failing test for unimplemented code is NOT a blocker - it's the specification you're implementing against.
Get your task details:
bd show <task-id>
Look for:
productionCodePath: What end users will run (e.g., "cli-tool command list")validation_checklist: Items you must satisfyacceptance_criteria: BDD criteria (Given/When/Then/Should Not)workerOwns: What parts of which files you ownratified_plan: Link to parent RATIFIED_PLAN taskUpdate status on start:
bd update <task-id> --status=in_progress
slice: Your slice identifier (e.g., "feature-list")productionCodePath: What users run (e.g., "cli-tool command list")workerOwns.types: Which types you createworkerOwns.tests: Which test files you writeworkerOwns.implementation: Which methods/actions you implementvalidation_checklist: Items you must verify (includes production code works)acceptance_criteria: BDD criteria for your sliceratified_plan: Link to parent planYou may be assigned a FOLLOWUP_SLICE-N task instead of a SLICE-N task. The implementation procedure is identical, with these additions:
bd show <task-id> for a "DEFER'd-Item Leaf Tasks" section.# Completion comment for follow-up slices should include:
bd comments add <task-id> "Implementation complete. Resolved DEFER'd-item leaf tasks: <leaf-task-id-1>, <leaf-task-id-2>"
On start:
bd update <task-id> --status=in_progress
On complete:
bd update <task-id> --status=done
bd update <task-id> --notes="Implementation complete. Production code verified working via code inspection."
On blocked:
bd update <task-id> --status=blocked
bd update <task-id> --notes="Blocked: <reason>. Need: <dependency or clarification>"