thrifty

Executor subskill for thrifty. ONE cached agent that builds an ordered list of units from their briefs in a single session — honoring the shared contract, running the gate, and self-fixing — then reports per-unit results. (Also handles the degenerate single-unit case.) Do not invoke directly — dispatched as a Haiku subagent by the thrifty orchestrator.

Use when the user says "thrifty", "delegate this", "tiered build", or asks to execute a spec cheaply. thrifty takes a spec you already have (written by hand or by any model — thrifty doesn't care which) and EXECUTES it for less. Orchestrates a tiered-delegation run: the architect (Sonnet) refines the spec into a contract that pins every cross-cutting decision, ONE cached Haiku executor subagent builds the whole ordered unit list in a single session (gate in-loop, self-fixing — not one subagent per unit), and Sonnet verifies/fixes only where a test can't judge. Works for code and non-code tasks alike. PREFER the lean dispatch flow (thrifty-dispatch) by default — it is the benchmarked, cheapest path; THIS subagent substrate is the richer, pricier fallback.

Lean tiered-build orchestrator (JSONL-dispatch architecture). Use for "thrifty fast / lean / dispatch", or a multi-sprint build where cost matters. The architect (Sonnet) writes a contract + a sprints.jsonl and calls a dispatch SCRIPT that loops cheap bare model calls (claude -p --bare, subscription, no API key) to write each sprint to disk — NO subagents. The orchestrator never ingests sprint outputs, only a manifest, so its context stays tiny. Then it runs the gate and surgical-fixes.

Brief-writer subskill for thrifty's split planning mode. Expands ONE terse unit spec (from the architect/director) plus the shared contract into a full, self-contained BRIEF with right-sized approach and concrete acceptance criteria. Has authority WITHIN its unit only; never re-decides anything the contract already pins. Do not invoke directly — dispatched as a Sonnet subagent by the thrifty orchestrator.

Checker subskill for thrifty. Verifies one completed unit against its acceptance criteria, attempts a surgical fix for small localized defects, and returns a structured verdict that diagnoses the failure so the orchestrator can route it. Do not invoke directly — dispatched as a Sonnet subagent by the thrifty orchestrator.

Planning discipline for thrifty, run by the architect (Sonnet) itself. Decomposes a task into units, writes CONTRACT.md (cross-unit decisions + dependency graph), one self-contained BRIEF per unit with concrete acceptance criteria, and initializes the LEDGER. Invoked by the thrifty orchestrator during the Plan step.