RepoLens
Codebase understanding for product and engineering
The fastest way to explainhow a codebase works,what changed, and where risk lives.
RepoLens turns complex repositories into evidence-backed explainers, change briefs, onboarding paths, and collaborative boards. It gives product and engineering a shared understanding layer instead of another throwaway AI answer.
Explain a feature for a PM without making them reverse-engineer the repo.
Turn a diff into a release brief, rollout risks, and QA guidance.
Onboard engineers into a subsystem with evidence, ownership, and history.
RepoLens Board
One workspace for explainers, change briefs, evidence, and next-step CLI actions.
Feature Explainer
Checkout flow, billing states, retry behavior, and which components own each transition.
Change Brief
User-visible impact, rollout concerns, QA checks, and release-note language from the same change set.
Suggested next step
`repolens trace --query BillingService --publish-board-id ...`
Outputs
Feature explainers
Change briefs
Code evolution reports
History-aware onboarding
Trust model
Evidence references and confidence
Persistent boards instead of chat loss
Local CLI for deeper repo history
Who it is for
A product surface for teams that need understanding, not just autocomplete.
RepoLens is strongest when a repo has grown beyond the point where one engineer can explain everything from memory. It helps product and engineering align on behavior, intent, impact, and risk.
For PMs
See what a system does, why it matters, what changed for users, and which risks deserve attention before launch.
For engineering leads
Map services, flows, hotspots, and ownership so complex repos become legible and reviewable faster.
For cross-functional teams
Keep explainers, change briefs, diagrams, and evidence in one persistent workspace instead of scattered chats and docs.
How it works
A shared understanding layer over the repo, with a direct path into local investigation.
RepoLens is not trying to replace engineers with a single prompt. It gives teams a durable system for understanding features, releases, and evolving subsystems, then hands off to the CLI when deeper analysis is required.
Step 1
Connect the repo and create a shared board
Start from GitHub or the local CLI, then give product and engineering one workspace for explainers, briefs, history, and follow-up investigation.
Step 2
Generate artifacts for the question at hand
Produce feature explainers, change briefs, ownership views, trace reports, and onboarding paths instead of forcing every question through one generic prompt.
Step 3
Move from the board into local investigation
Use RepoLens CLI handoff to trace a symbol, inspect a subsystem, or publish a deeper history report back into the same board.
Core workflows
Start from the question your team actually has.
RepoLens is built around the three questions that show up constantly in real teams: what does this do, what changed, and where do I start?
Feature understanding
Generate explainers that read like product understanding, not raw code commentary.
RepoLens connects architecture, behavior, and evidence so product and engineering can discuss the same system in the same language.
Change intelligence
Convert diffs into impact, risk, and QA-ready change briefs.
Use local git history, evidence-backed outputs, and structured briefs to understand what really changed before release.
Codebase onboarding
Give new engineers a credible start-here path through unfamiliar repos.
Trace symbols, surface ownership, summarize subsystem evolution, and keep the context attached to a board your team can reuse.
Questions answered
The same repository can answer very different questions for PMs and engineers.
RepoLens keeps those answers aligned. Product gets behavior and impact. Engineering gets structure, evidence, and next steps. Both stay attached to the same board.
What does this feature actually do?
PM view
Get a PM-readable explanation of user flows, business logic, edge cases, and release impact.
Engineering view
See the services, files, transitions, evidence, and ownership behind the same feature.
What changed in this release?
PM view
Turn a diff into user-visible changes, rollout considerations, and launch-ready release notes.
Engineering view
Turn the same diff into implementation impact, risk concentration, and QA coverage prompts.
Where should someone start in this codebase?
PM view
Understand the subsystem boundaries and why this area matters before entering planning or delivery discussions.
Engineering view
Get a history-aware reading order with hotspots, owners, symbols, and likely starting files.
Evidence first
Every artifact points back to files, line ranges, and confidence signals so teams can inspect the reasoning.
Built for real repos
RepoLens works across current-state explainers, change briefs, and codebase evolution workflows instead of pretending one prompt solves all three.
Terminal workflows
When the board is the place to align, and the terminal is the place to go deeper.
RepoLens keeps shared understanding in the web product, then hands off into local repo analysis when a team member needs ownership, trace, hotspots, history, or agent-assisted investigation from the actual checkout.
Web to terminal
Start from a board question, then launch the exact next CLI step from the same workflow.
Follow-up commands, launcher handoff, and board-linked publishing let a user move from “What changed here?” to a local investigation without losing context.
CLI outputs
Why teams adopt it
It closes the gap between code, product context, and operational decision-making.
Most teams already have code search, code review, and docs. The missing layer is shared understanding: a way to explain what the system does and how it evolved without forcing every stakeholder into the raw repo.
Built for product and engineering together, not just for the person closest to the code.
Uses evidence, history, and reusable artifacts instead of one-off chat answers.
Moves cleanly from web workflow into local terminal investigation when deeper analysis is needed.
FAQ
The questions teams usually ask before adopting a product like this.
RepoLens is a new category for many teams. The right comparison is not just “another AI tool,” but a shared understanding system for repositories that are too important and too complex to leave implicit.
Is RepoLens a code chatbot?
No. It is a system for producing durable, evidence-backed artifacts about a repository: feature explainers, change briefs, ownership views, onboarding paths, and history-aware reports.
Why is this useful for PMs if engineers already know the repo?
In mature products, understanding is rarely concentrated in one person for long. RepoLens helps PMs get a credible explanation of behavior and release impact without pulling engineers into the same repetitive walkthroughs every week.
How is this different from docs?
Docs are still valuable, but they drift. RepoLens works from the repository, the current change set, and local git history so teams can recover understanding even when documentation is incomplete or outdated.
When does the CLI matter?
The web product is where teams collaborate. The CLI matters when someone needs deeper local investigation, richer git history, lower-token analysis, or direct handoff into tools like Codex or Claude Code.
Call to action
Give your PMs and engineers the same answerable view of the codebase.
Start with GitHub, generate a board, and move from repository confusion to shared understanding with evidence attached.