New skill that runs after a clean audit at milestone close. Picks
2-4 real-world programming tasks within the milestone's scope,
implements each in the AIL Surface form (.ailx), runs the binaries,
and writes a friction-and-bug spec to docs/specs/<date>-fieldtest-
<milestone>.md.
The dispatched agent (ailang-fieldtester) is restricted to DESIGN.md
plus the public examples/ corpus — crates/, runtime/, bench/ are
forbidden reads. This simulates a downstream LLM author who has only
the specification, which is the empirical complement to brainstorm's
prospective application of the LLM-utility criterion.
Findings classify as bug / friction / spec_gap / working, each with
a one-line downstream recommendation (debug / plan / ratify /
carry-on). The orchestrator dispatches the follow-ups; fieldtest
does not self-resolve.
Files:
- skills/fieldtest/SKILL.md
- skills/fieldtest/agents/ailang-fieldtester.md
- .claude/skills/fieldtest, .claude/agents/fieldtest (discovery
symlinks)
- skills/README.md updated (skill table → 6, pipeline ASCII,
agent roster, discovery list)
Hypothesis-driven measurement of "did monomorphisation actually
buy us performance?" on a 100M-iter LCG hot loop, AILang mono'd
code vs. four C reference variants (direct-inlinable, direct-
noinline, indirect-monomorphic, indirect-polymorphic). Zen 3,
clang -O2, median-of-15.
Headline: H1 supported, but the mechanism is inlining, not
dispatch shape. AILang mono = hand-C direct (1.000x). Indirect-
monomorphic = direct-noinline (1.000x) — saturating branch
predictor makes the indirect-call cost vanish on this hardware.
Inlining is the actual 3.31x win; polymorphic indirect adds
another 21% predictor-miss penalty.
DESIGN.md Decision 11 gains a rationale paragraph reframing mono
as inlining-enabler rather than indirect-call-eliminator, with
explicit pointer to the bench. JOURNAL entry records the full
methodology, ratios, limitations, and the side-effect mono-pass
env.globals-seeding bug surfaced while building the AILang fixture
(separate RED-first debug iter to follow).
Brummel