| name | focused-loop-builder |
| description | Use when the user asks to "create a custom build loop", "build a loop spec", "make a focused loop", "generate a workflow loop", "adapt a framework into a loop", or asks whether a workflow should use skill chaining. Generates declarative focused-loop specs, presets, validators, and skill-chain plans. |
| version | 0.1.0 |
| user-invocable | false |
focused-loop-builder
Create declarative focused-loop specs that reuse build-loop's phase discipline outside pure coding work. The skill turns a preset or framework into a small loop pack: loop.yaml, rubric.md, report template, validator stub, and explicit skill-chain guidance.
Core Rule
Keep the runner generic and the loop domain-specific. Do not create a new orchestrator for every workflow. Generate a loop spec that declares inputs, outputs, validators, gates, learn payload, and skill-chain handoffs.
Workflow
-
Classify the loop request.
- Use a preset when the user asks for a known loop type: active project evidence, source ingestion, raw data audit, presentation audit, or research synthesis.
- Use the generic artifact lifecycle preset when the request is novel but still follows intake -> provenance -> produce -> review -> learn.
- Use a framework adaptation when the user provides a method such as Pyramid Principle, PRISMA, ISO 19011, GTD, DMAIC, OKR, or a company-specific workflow.
-
Define the artifact contract.
- Name accepted inputs.
- Name target outputs.
- State the validator evidence required before success.
- State confirmation gates: external send, sensitive data exposure, money movement, legal assertion, production/customer operation, people-impacting decision, irreversible source-of-truth change.
-
Plan skill chaining.
- Treat skill chaining as phase routing, not a hidden dependency.
- Declare the chain in
skill_chain with phase names and fallback behavior.
- Prefer existing skills for specialized work:
research for evidence gathering, Pyramid skills for presentation/storyline work, doc for Word documents, build-loop:knowledge for durable memory, and plugin-builder or skill-builder only when generating new capabilities.
- Every chained skill must hand back a concrete artifact path or decision record.
-
Generate the loop pack.
-
Review the generated spec.
Deterministic vs AI Step Rubric
For every step in a generated loop, decide whether it is a hardcoded SCRIPT (deterministic) or an AI/LLM step. Default to code; earn the LLM call. A probabilistic step placed on a deterministic problem costs money, latency, and audit-failures on every run; a deterministic step on a genuinely ambiguous problem fails visibly on the long tail. The costs are asymmetric, so when in doubt, choose deterministic.
DETERMINISTIC (script / rule) — pick this when the step has any of:
- Enumerable / bounded inputs.
- Machine-checkable output against a fixed contract.
- Commits an irreversible or system-of-record action (write, publish, send, migrate).
- A safety, compliance, or financial threshold.
- High call-frequency or cost-sensitivity.
- Must-not-vary-run-to-run output (determinism is part of the contract).
- Structure the shell / AST / schema already encodes (parse it, don't ask a model to guess it).
AI / PROBABILISTIC (LLM) — pick this only when the step genuinely needs:
- Natural-language understanding of intent, tone, or semantics.
- Open-ended generation, summarization, or insight-extraction.
- Long-tail inputs no finite rule covers.
- Judgment or ambiguity as the actual work, not incidental to it.
HYBRID is the default shape: deterministic scaffold → a narrow LLM step only where a rule can't reach → a deterministic verify/gate on the LLM output. Every generated LLM step must carry (a) an output schema/type and (b) a deterministic post-check. If you can't write the post-check, the step's boundary is wrong — narrow the LLM's job until its output is checkable.
Tie-breaker: default to deterministic.
This rubric is the loop-authoring twin of build-loop's Item-18 dispatch_tier script eligibility test (skills/spec-writing/SKILL.md §Item 18 — machine-checkable output, fully enumerable inputs, tool exists or is ≤~50 LOC + colocated test) and the repo's deterministic-first posture (skills/build-loop/references/deterministic-checks.md where present). Assign the same way here: a loop step earns an LLM tier only when a script cannot reach the work.
Provenance for the rubric (cite when adapting): Anthropic, "Building Effective Agents" (start with the simplest thing that works; prefer composable workflows with deterministic code paths + gates over open-ended agents); OpenAI, "A Practical Guide to Building Agents" (validate you actually NEED an agent before building one; rate each tool/action by write-access, reversibility, and financial impact, and gate high-risk actions deterministically). Both land on the same posture build-loop already runs: deterministic by default, LLM where judgment is the work, a check on every probabilistic output. See build-loop-memory/research/2026-07-06-ai-coding-fundamentals-and-harness-claims.md (Claim 5).
Loop-spec encoding. Declare each step's assignment with the optional step_type (script | ai | hybrid) and post_check fields per phase — see references/spec-format.md §"Deterministic vs AI Steps". These are advisory today (no generator lint yet — see the note in that section); write them so the rubric is auditable by a reviewer and enforceable later.
Skill Chaining Guidance
Use skill chaining when the loop has stable phase boundaries and at least one phase is better handled by an existing specialized skill.
Good candidates:
- Research -> synthesis -> presentation/storyline -> audit -> knowledge promotion.
- Source ingestion -> raw-data audit -> source card -> retrieval/index check.
- Presentation audit -> Pyramid critique -> accessibility check -> fix plan.
- Word doc audit -> document parser -> claim verification -> redline report.
- Interview synthesis -> quote extraction -> themes -> deck/source-card output.
Avoid chaining when:
- A single deterministic script can do the whole job.
- Phase outputs are vague or untestable.
- The chain would make ownership unclear.
- A specialist skill would produce advice without a file, verdict, or cited evidence trail.
Presets
List presets:
python3 skills/focused-loop-builder/scripts/loop_builder.py list
Create a loop:
python3 skills/focused-loop-builder/scripts/loop_builder.py create active-project-evidence --preset active-project-evidence
Inspect a preset:
python3 skills/focused-loop-builder/scripts/loop_builder.py inspect presentation-audit
Additional Resources
references/spec-format.md describes the generated loop schema and skill-chain fields.scripts/loop_builder.py is the deterministic generator.presets/*.yaml contains YAML-compatible preset definitions.
