verification for ai-written code
The code got faster.Trust didn’t.
Rival AI agents compete on your task. Your own tests prove the survivors. You get one result, one receipt you can defend, and the last call is yours.
scroll · the run starts here
00 · the wound
Same prompt. Different code. Same confidence.
Green tests. A deadline. A diff you skimmed. Every merge of AI-written code is a bet, and it carries your name.
feat: retry on stale session+184 −32
go ahead. you always do.you click. you hope.
01 · the turn
So we stopped asking for opinions.
Fusion runs the task instead of debating it. One command in, one verified result out. This is what a run looks like.
$ fusion build "add rate limiting to the api"
02 · sealed rooms
One task. Rival attempts.
Agents from different labs get the same brief in isolated git worktrees on your machine, blind to each other. Your live code stays untouched.
03 · the race
They race.
Each candidate solves it its own way. Watch every move live on the dashboard, and stop it all with one button.
04 · the gate
Let execution say no.
Build, tests, lint. The gate is restored from a clean baseline every run, so it can't be gamed and can't be weakened. The polished failure leaves the race here.
eliminated · gate
- ✓bun run build
- ✗bun test
- ✓lint · typecheck
05 · blind jury
Identity leaves the room.
Independent judges score the survivors criterion by criterion: no names, no logos, shuffled order. A judge can't favor its own work when it can't tell which is its own.
judge 03vendor hidden ▚▚▚
correctness7/7
edge cases5/7
readabilitypass
vote: candidate b
2–1 for candidate adissent preserved, never smoothedunmasked only after votes land
06 · the fusion
The winner takes the rival's best ideas.
An integrator grafts every insight the jury flagged into the winning branch. Every line keeps its provenance: winner, grafted, or integrator's own.
from the winner grafted from the rival integrator’s own
- ✓ jury pass 2 · before vs after · unanimous
- ✓ qa · full re-gate · pass
07 · re-checked
Then it gets checked again.
A second blind pass judges the fused result against the original, before versus after. A fresh QA pass re-runs the whole gate. Verified fails closed.
08 · the receipt
The receipt nobody else can print.
What competed, what passed, who judged, who dissented, what got fused. Until the proof lands it stays not issued. The seal is the only green Fusion ever claims, and it has to be earned.
FUSION RECEIPTrun 7692e8fd
RUN3 candidates · isolated · blind
GATEbun test · 1 eliminated
JURY3 blind judges · 2–1 · dissent kept
FUSIONwinner + grafted insights
QAfull re-gate · pass
✓ fusion_verified: true
09 · the human
Fusion never presses the button.
It opens the pull request and steps back. Same button as before. Different you.
- never merges
- never ships
- never force-pushes
- never touches branch protections
the human✓ fusion receipt attached · verifiedsame button. different you.
the trust spectrum
Why competition beats inspection.
Today’s AI review tools are one bot checking one bot: trust by inspection. Fusion is trust by construction. There are three grades of trust in AI-written code, and only one of them is proof.
Fusion ships the top two. Most of the market sells the bottom one.
verified means the gate passed and every hard criterion held. it fails closed: missing proof withholds the stamp, never fakes it.
two touchpoints
Where you actually see it.
Fusion is not an IDE plugin and not a chat window. It runs where your code lives and reports where your team already works.
while it runs
The dashboard
Watch the race live in your browser: lanes, diffs, the gate, the verdicts, and the spend. Stop it with one button, any time.
when it’s done
Inside GitHub
A new pull request carrying the check it earned, or a verified fix posted back onto the PR you sent in. Opened for review, never merged for you.
Watch, then decide. That’s the whole interface.
pricing, in one idea
A run costs its depth.
Candidates, judges, integrators: pick how deep the tournament goes, and that number is the price in credits. Same meter for Build and Review.
1 / 1 / 11creditevidence-grade
2 / 2 / 22credits✓ fusion verified
3 / 3 / 33credits✓ fusion verified
4 / 4 / 44credits✓ fusion verified
5 / 5 / 55credits✓ fusion verified
fusion
We’re onboarding a small group of design partners now. Bring a repository and a task; leave with a verified pull request and the receipt that proves it.
get early accesshello@fusioncoding.ai