Map
Context Engine
Maps what's actually untested: critical paths weighted by change frequency and incident history, not just a line-coverage number.
Test Coverage
Untested code is risk waiting to ship. Agents close the gaps.
Drive coverage up and keep every suite green with a fleet of agents.
Cosmos maps the untested critical paths with the Context Engine, drafts a test plan your team approves, and fans a fleet of agents across your repos, writing tests that assert real behavior and fixing flakes at the root.
cosmos / testing / payments-coveragelive · wave 2 of 3
Codebase test coverage
47%
up from 47% · last 7 waves
suites green142 / 147
false alarms−76%
tests added+214
agents active9
risk backlog−62%every test reviewed for meaning · no flakes land
Meet Cosmos
A fleet of agents behind every suite.
Agents now write most of the code, and every untested path they touch is risk you absorb at merge. Point Cosmos at your codebase: the Context Engine finds what's actually untested, the Planner turns it into a test plan your team approves, and the fleet executes it across repos in parallel, with every test reviewed before it lands.
What our customers are seeing
2 days
To fully test a release, down from 3 weeks
2.3×
Test coverage once deployed
76%+
Fewer false-alarm test failures
3×
Faster to write and maintain tests
One fleet takes the suite from untested to trusted.
Cosmos runs the whole arc. The Context Engine maps what's actually untested, the Test Planner drafts a plan your team approves, Test Authors write suites across repos in parallel, and the review fleet checks every test for meaning before it merges. Every flake found gets fixed at the root, not retried.
Coverage lifecycleone plan, end to end
Map
Context Engine
Maps what's actually untested: critical paths weighted by change frequency and incident history, not just a line-coverage number.
Plan · Approval
Test Planner
Drafts the test plan from the map: what gets unit, integration, and E2E coverage, the fixtures to build, and the flake-fix strategy.
Human
Approves the plan and the coverage bar. Sets what blocks a merge.
Author · parallel
Test Authors
Write tests that assert behavior, not implementation, across repos in parallel. Each suite runs in an isolated environment against real code.
Review
Review Fleet
Checks every test for meaning: does it fail when the code breaks? Then screens for flakiness before anything lands.
Suites green · coverage holds the floor
Coverage Floor
Every merge holds the bar · The fleet keeps it green
Fig 1 · Testing fleet
How the fleet tests
Tests that prove, not perform.
A coverage number is easy to inflate and easy to ignore. The fleet is judged on something harder: every test it writes has to fail when the code breaks, pass when it doesn't, and survive the next refactor. That's what makes a green build worth trusting.
Coverage theater
Built around a number
- Tests written last, against the deadline
- Assertions that mirror the implementation
- Flaky suites everyone retries and nobody fixes
Cosmos testing
Built around behavior
- Critical paths first, risk-weighted by the Context Engine
- Tests assert behavior and survive refactors
- Flakes fixed at the root, never quarantined
- Coverage becomes a floor that only rises
Where programs start
Built for the suites teams stopped believing.
If shipping still ends with a manual checklist or a crossed finger, there's a program for it. Three places most teams start.
Legacy coverage retrofit01
The safety net before you touch it.
The codebase you inherited at 12% coverage. The fleet builds the suite first, critical paths before breadth, so the refactor or migration that follows lands on solid ground.
SCOPE: 12% → 80% · 6 services
Regression & E2E automation02
QA cycles in minutes, not weeks.
Manual regression checklists become E2E suites that run on every PR: user flows, visual checks, and edge cases, executed in isolated environments while the release waits on nothing.
SCOPE: 400 manual checks → CI
CI health & flake elimination03
A green build means something again.
The fleet triages every red build, bisects the flaky tests, and fixes the root cause instead of adding retries, so a failure is a signal, not a shrug.
SCOPE: flake rate 3.2% → 0.1%
PlaywrightGitHub ActionsCircleCIJenkinsGDPR · CCPA · HIPAA
Highly customizable to your stack.
Talk to Cosmos Advisor to shape the program around your stack: which frameworks and runners the fleet uses, what the coverage bar is per service, and what blocks a merge. Keep your CI, your test frameworks, and your compliance posture.
Works with the suites you already have. The fleet extends them rather than replacing them.