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+---
+name: frontier-loop
+description: Run an indefinite autonomous experimental or optimization loop when progress can be measured. Use alongside `fidget-spinner` when the task is an open-ended frontier push with a real evaluation signal.
+---
+
+# Motivational Quote
+
+“The primary thing when you take a sword in your hands is your intention to cut
+the enemy, whatever the means. Whenever you parry, hit, spring, strike or touch
+the enemy's cutting sword, you must cut the enemy in the same movement. It is
+essential to attain this. If you think only of hitting, springing, striking or
+touching the enemy, you will not be able actually to cut him.”
+
+― Miyamoto Musashi
+
+# Summary
+
+Use this skill when the task is open-ended, but progress can still be measured
+credibly: a benchmark, a score, a win rate, a proof obligation, a test suite,
+or some other signal that distinguishes progress from churn.
+
+When using this skill, the `fidget-spinner` is the canonical recordkeeping surface.
+You MUST use that skill.
+
+DO NOT INVENT A PARALLEL LEDGER.
+DO NOT KEEP FRONTIER-RELEVANT STATE ONLY IN FREEFORM PROSE OR MEMORY.
+
+`frontier-loop` owns the control loop.
+`fidget-spinner` owns the ledger.
+
+Do not restate those rules ad hoc. Use the `fidget-spinner` surface.
+
+## Before Starting
+
+Do not begin the loop until these are reasonably clear:
+
+- the objective
+- the evaluation method
+- the current best known baseline
+
+Infer them from context when they are genuinely clear.
+If the evaluation signal is mushy, force it into focus before going rampant.
+
+Before the first serious iteration, read the frontier and recent evidence
+through `fidget-spinner`.
+
+On resume, after interruption, or after compaction, read them again.
+Do not trust memory when the DAG exists.
+
+## Loop
+
+LOOP UNTIL STOPPED BY THE USER OR BY A REAL EXTERNAL CONSTRAINT.
+
+DO NOT STOP BECAUSE YOU HAVE ONE PLAUSIBLE IDEA.
+DO NOT STOP BECAUSE YOU HAVE A CLEAN INTERMEDIATE RESULT.
+DO NOT STOP TO GIVE A PROGRESS REPORT.
+DO NOT EMIT A FINAL TURN UNLESS YOU ARE ACTUALLY BLOCKED OR EXPLICITLY TOLD TO STOP.
+
+ASSUME YOU ARE RUNNING OVERNIGHT.
+
+1. Start from the current best checkpoint or most credible live branch.
+2. Study existing evidence from `fidget-spinner`.
+3. Search outward if the local frontier looks exhausted or you are starting to take unambitious strides.
+4. Form a strong, falsifiable hypothesis.
+5. Make the change.
+6. Measure it.
+7. If the result is surprising, noisy, or broken, debug the implementation and
+   rerun only enough to understand the outcome.
+8. Record the outcome through `fidget-spinner`.
+9. Keep the line if it advances the objective or opens a genuinely strong new avenue.
+10. If the line is dead, record that too, re-anchor to the best known checkpoint,
+    and try a different attack.
+11. Repeat.
+
+I REPEAT: DO NOT STOP.
+
+## Research Posture
+
+Keep the search broad and continuous.
+
+Do not confine yourself to the obvious local neighborhood if better ideas may
+exist elsewhere. Use documentation, papers, source code, issue trackers,
+benchmarks, adjacent fields, and competing implementations whenever they can
+improve the next experiment.
+
+If progress stalls, widen the gyre instead of polishing the same weak idea to
+death.
+
+Prefer bold, testable moves over cosmetic churn.
+Do not overinvest in a line of attack that has ceased to earn belief.
+
+You are a researcher and explorer. Think big.
+
+Do not get stuck doing small tweaks.
+
+## Experiment Discipline
+
+Every real experiment must leave an auditable record in `fidget-spinner`.
+
+If something matters to the frontier, put it in the DAG.
+
+Use off-path records liberally for enabling work, side investigations, and dead
+ends.
+
+When a line becomes a real measured experiment, close it through the proper
+`fidget-spinner` path instead of improvising a chain of half-recorded steps.
+
+## Resume Discipline
+
+On interruption, restart, or strange MCP behavior:
+
+- check health through `fidget-spinner`
+- reread frontier state
+- reread the most recent relevant nodes
+- then continue the loop
+
+On compaction, reread the DAG record before choosing the next move.
+
+## And Remember
+
+Cut the enemy. Think, what is the shortest path from A to B, truly?
+
+Seize it.
+
+The end is all-consuming.
+
+Cut! Leap! Seize!
+
+DO NOT STOP!