Your AI agent writes technically correct code that quietly breaks your architecture.
Contexer silently captures every decision your AI makes mid-session and replays them at the start of every future session — so your agent never starts blind.
AI agents are brilliant at pattern matching.
Terrible at remembering yours.
Documentation rots
READMEs and ADRs lag behind code by weeks. By the time the agent reads them, they're already wrong.
Tribal knowledge stays tribal
The reason you don't use that ORM is in someone's head. The agent will helpfully reintroduce it.
Rules drift every commit
A new top-level dir, a swapped dependency, a renamed pattern — your CLAUDE.md is stale by Friday.
Three steps. No meetings.
Install in 2 minutes
No account. Works with any git repo.
$ uv tool install contexer $ contexer install ✓ installed ✓ hooked into claude code ✓ ready
Work normally
Contexer runs silently. As you work with Claude, decisions are captured automatically — architecture choices, constraints, conventions. Nothing manual.
// session · 14:32 captured: constraint "data access goes through createServerFn only" captured: convention "Zod schemas live in src/lib/schemas.ts"
Next session starts with full context
Constraints and conventions are injected before you type anything. Ask a "why" question and the relevant rationale is retrieved automatically.
// session · resumed loaded: 14 constraints loaded: 9 conventions > why do we use BillingProvider? ↳ retrieved: architecture decision "Stripe adapter is migrating, use BillingProvider instead"
Four types of context. Nothing else.
Start free. No account needed.
Open Source
Install in 2 minutes. No account. Works with any git repo.
MIT licensed · Self-hosted · No account required
- ✓Automatic decision capture
- ✓Session memory across prompts
- ✓Rationale injection on "why" questions
- ✓Global conventions store (cross-repo)
- ✓Works with any git repo
Teams
Shared intelligence layer built on top of the open-source engine.
The team layer is coming. Get in line.
Get in touch
Questions, feedback, or partnership ideas — pick the channel that suits you best. We typically respond within one business day.