Migrations are well-defined. They just take forever.
Every engineering team has a list of migrations that should have happened last quarter. Upgrade the framework. Replace the deprecated library. Refactor the legacy module. The pattern is known. The work is repetitive. The problem is that nobody has weeks to grind through it.
Large-scale migrations involve hundreds of files. Each change needs to be verified against the test suite. Each PR needs to be reviewed. The scope is massive, but the work per file is mechanical, exactly the kind of task agents are built for.
Tembo agents apply an approved pattern across your entire codebase, verify every change with tests and builds, and produce reviewable PRs. One approved pattern can generate 100+ PRs, each one tested and ready for review.
Define the pattern. Agents apply it everywhere.
- 1
Define the migration pattern
Describe the change: upgrade React class components to hooks, replace Moment.js with date-fns, migrate from REST to GraphQL. Provide examples or let the agent learn from your first approved PR.
- 2
Agents fan out across the codebase
Tembo identifies all files that match the pattern and dispatches agents to apply the change. Each agent works in its own isolated environment with your full repo and dependencies.
- 3
Every change is verified
Each agent runs the test suite, builds the project, and confirms the migration did not break anything. Failed changes are flagged for manual review, not shipped blindly.
- 4
Review and merge at your pace
PRs are opened for review. Your team reviews them like any other PR: batch merge the clean ones, dig deeper on the ones that need attention. Ship at your pace.
The work that has been deferred for quarters.
Framework upgrades
React 17 to 18, Rails 6 to 7, Next.js 13 to 14. Upgrade major versions across your entire codebase.
Library replacements
Replace Moment.js with date-fns, jQuery with vanilla JS, or any deprecated library with its modern alternative.
API migrations
REST to GraphQL, Webpack to Vite, class components to hooks. Change the patterns across every consumer.
Language upgrades
Python 2 to 3, TypeScript strict mode, ES5 to ES2022. Modernize your language usage consistently.
Large-scale refactors
Rename patterns, restructure directories, extract shared modules, consolidate duplicated logic.
Tech debt cleanup
Remove dead code, update deprecated APIs, fix warnings, modernize test patterns. Years of backlog cleared.
7 years of tech debt. Cleaned up.
Tilt defined a single migration pattern, approved the first PR, and Tembo agents applied it across their codebase. ~120 PRs were generated, tested, and opened for review.
Legacy patterns, deprecated APIs, outdated conventions: the kind of work that gets deferred every sprint. Agents ground through it methodically while the team focused on product work.
“You just fire it off in the cloud and it handles everything. We defined the pattern once, approved the first PR, and it just kept going. ~120 PRs later, 7 years of tech debt was cleaned up.”
Pick the use case that matters most to your team
Code review & visual QA
Every PR reviewed in a real environment. Agents check out the code, run tests and builds, catch visual regressions, and leave actionable comments, not just lint passes.
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Incident triage & bug fixing
Sentry alert comes in. Fix PR goes out. Humans review. Ali at Integral came into the office to find 12 Tembo PRs waiting. He closed 3 Sentry issues in under 5 minutes.
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