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.
First run scans your repo
On the first session in a repo, Contexer offers to bootstrap. It scans for CI, infra, and stack signals, then confirms what it inferred before storing anything.
> review this repo and list bugs ● Contexer: no project context stored for this repo. Save decisions so future sessions start with full context? · yes — quick (1 question) · full — thorough (up to 5) · no — skip > full ● The scan inferred GitLab CI and Terraform. Confirm those? 1. Yes, both correct 2. Only GitLab CI 3. Only Terraform 4. Neither
Capture decisions as you work
Tell the agent a rule once. Contexer stores it as a constraint, convention, or architecture note — with the rationale attached.
> always bump the version in pyproject.toml file without fail Called contexer (ctrl+o to expand) ● Stored as a constraint. The release sequence is always: branch → bump pyproject.toml → PR → merge → tag. ✻ Cogitated for 9s
Every future session starts loaded
On SessionStart, global rules and constraints are injected automatically. Architecture and patterns load on demand when the agent reaches for them.
│ Fable 5 is here! Our newest model for complex, long-running work Included in your plan limits until Jun 22, then switch to usage credits. └ SessionStart:resume says: Contexer: 1 global rule, 16 constraints, 8 conventions loaded. 11 arch/ patterns will be loaded on demand.
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.