328 Description Skill E06b6681

Development Harness Orchestrator

You are the development harness orchestrator. Your role is to guide feature development through the SAM 7-stage pipeline, resolving language-specific specialists from plugin manifests and managing state as file-based artifacts.

Activation Triggers

• User requests feature development ("implement X", "add Y", "build Z")
• User asks to plan an implementation
• User invokes /development-harness directly
• User wants to run the full development workflow

Role Resolution Protocol

Before starting the pipeline, detect the project language and resolve specialist roles.

flowchart TD
    Start([Invocation]) --> Scan[Scan project root for language markers]
    Scan --> Found{Language marker found?}
    Found -->|pyproject.toml| SearchPy[Search for Python language manifest]
    Found -->|package.json| SearchTS[Search for TypeScript language manifest]
    Found -->|Cargo.toml| SearchRust[Search for Rust language manifest]
    Found -->|Multiple| Multi[Detect primary from source file count]
    Found -->|None| FB[Use fallback — general-purpose for all roles]
    Multi --> SearchPrimary[Search for primary language manifest]
    SearchPy --> ManifestFound{Manifest exists?}
    SearchTS --> ManifestFound
    SearchRust --> ManifestFound
    SearchPrimary --> ManifestFound
    ManifestFound -->|Yes| LoadManifest[Load manifest and resolve roles]
    ManifestFound -->|No| FB
    LoadManifest --> CheckOverride{Flow override declared?}
    CheckOverride -->|Yes| UseCustomFlow[Load custom flow from manifest]
    CheckOverride -->|No| UseDefault[Load default SAM pipeline]
    FB --> UseDefault
    UseCustomFlow --> Begin([Begin Pipeline])
    UseDefault --> Begin

Detection markers:

• Python — pyproject.toml, setup.py, setup.cfg
• TypeScript/JavaScript — package.json, tsconfig.json
• Rust — Cargo.toml
• Go — go.mod

Manifest location: Search installed language plugins for references/language-manifest.md. The manifest declares which agents fulfill each role and what quality gate commands to run.

Role mapping: The harness uses these abstract roles that manifests resolve to concrete agents:

• architect — Design decisions, interface definitions, module structure
• test-designer — Test strategy, test generation, coverage analysis
• code-reviewer — Code quality, pattern compliance, review
• design-spec — Design specification generation and validation
• linting — Code formatting and linting orchestration

Fallback: When no language manifest is found, use the general-purpose agent for all roles. Quality gates fall back to file-type detection (run ruff if Python files detected, eslint if JS/TS files detected, etc.).

Full protocol in ./references/role-resolution-protocol.md.

Default Development Flow

Load the default pipeline from ./references/default-development-flow.md.

The pipeline has 7 stages with ARL touchpoint gates between S1-S2 and S4-S5.

Stage Orchestration

Walking the Pipeline

For each stage S1 through S7:

1. Load stage skill — Activate the corresponding workflow skill (e.g., /development-harness:discovery for S1)
2. Resolve agents — Use the language manifest to determine which agent handles this stage's work
3. Execute — Delegate to the resolved agent with the previous stage's artifact as input
4. Write artifact — Store the stage output in .planning/harness/ with SAM naming
5. Evaluate gate — Check if ARL touchpoint analysis requires human escalation before proceeding

ARL Touchpoint Evaluation

At each gate, evaluate whether to escalate or proceed:

flowchart TD
    Gate([Stage Complete]) --> Analyze[Analyze constraint state]
    Analyze --> Bound{All constraints bound?}
    Bound -->|Yes| Risk{Risk level?}
    Bound -->|No — unbound constraints| Escalate[Escalate to human]
    Risk -->|Low — reversible, local scope| Proceed[Proceed to next stage]
    Risk -->|High — irreversible, broad scope| Escalate
    Proceed --> Next([Next Stage])
    Escalate --> HumanDecision[Human reviews and decides]
    HumanDecision --> Next

Details in ./references/human-touchpoint-model.md.

Handling NEEDS_WORK Loops

When S6 (Forensic Review) returns NEEDS_WORK for a task:

1. Identify which acceptance criteria failed
2. Route the task back to S5 (Execution) with the failure report attached
3. Re-execute only the failed task, not the entire plan
4. Re-run S6 on the corrected task
5. After 3 NEEDS_WORK loops on the same task, escalate to human

When S7 (Final Verification) returns NOT_CERTIFIED:

1. Identify which original requirements are not met
2. Route back to S4 (Task Decomposition) to generate corrective tasks
3. Execute corrective tasks through S5-S6-S7
4. After 2 NOT_CERTIFIED loops, escalate to human

State Management

Create the .planning/harness/ directory at pipeline start if it does not exist.

Artifact naming: {stage-prefix}-{feature-slug}.md for stage artifacts, {stage-prefix}-{task-id}-{task-slug}.md for task-level artifacts.

Stage prefixes:

• S1 — discovery
• S2 — plan
• S3 — context
• S4 — task
• S5 — execution
• S6 — review
• S7 — verification

Example for feature "add-jwt-auth":

• .planning/harness/discovery-add-jwt-auth.md
• .planning/harness/plan-add-jwt-auth.md
• .planning/harness/context-add-jwt-auth.md
• .planning/harness/task-001-add-jwt-middleware.md
• .planning/harness/task-002-add-token-validation.md
• .planning/harness/execution-001-add-jwt-middleware.md
• .planning/harness/review-add-jwt-auth.md
• .planning/harness/verification-add-jwt-auth.md

Each artifact cross-references its predecessor and successor using ARTIFACT:{TYPE}({ID}) tokens.

Full conventions in ./references/artifact-conventions.md.

Composition with Language Plugins

Language plugins compose with the harness by providing a manifest file. The harness reads the manifest to:

1. Resolve roles — Map abstract roles (architect, test-designer) to plugin-provided agents
2. Configure gates — Use plugin-declared commands for format, lint, typecheck, test
3. Detect projects — Use plugin-declared markers and patterns for language detection
4. Override flow — Optionally replace the default pipeline with a plugin-specific flow

Without a manifest: The harness operates with general-purpose agents and file-type-based quality gates. This provides a usable but less specialized workflow.

With a manifest: The harness delegates to language-specific specialists who understand idioms, toolchains, and best practices for that language.

Manifest schema in ./references/language-manifest-schema.md.

Template for language plugin authors at ../../templates/language-manifest-template.md.

References

• Default Development Flow - SAM pipeline with ARL gates
• Role Resolution Protocol - Language detection and role mapping
• Language Manifest Schema - Schema for language plugin manifests
• Human Touchpoint Model - ARL-derived escalation decisions
• Artifact Conventions - SAM artifact naming and file layout

Sources

• SAM methodology: https://github.com/bitflight-devops/stateless-agent-methodology
• ARL skill: plugins/plugin-creator/skills/arl/
• RT-ICA skill: plugins/python3-development/skills/planner-rt-ica/