The context layer for your_
Appear is being wound down as a standalone platform. From it we built ctxpipe.ai: an engineering context layer for AI agents. It covers your whole org — code, ADRs, docs, issues, outages — not just your APIs.
A context layer, not only for your APIs — for your entire engineering org
Appear started with API context for agents. That was too narrow. ctxpipe is the engineering context layer: a self-learning knowledge graph of your whole org — code, ADRs, docs, issues, outages — so coding agents share the same context, not just your specs.
Self-learning knowledge graph
Connect your git repos and other sources. The graph ingests your whole engineering org — code, ADRs, AGENTS.md, skills, issues, docs, outages — and compounds with every commit, decision, and agent run.
One MCP, every agent
Cursor, Claude Code, Copilot, and more all get the same org-wide context through one agent-agnostic MCP connection (ctx_advisor).
Control & governance at scale
Git-first: git is the source of truth, the instructions hierarchy lives in your repo, and governance is reviewed in PRs — during agent planning and execution.
Self-host or managed
Open-source core (ELv2). Self-host the graph or use the managed version — your choice at any scale.
Appear's tools & resources, still available
The platform is being wound down, but the open tools and references we built remain available to everyone.
Specs Hub
Interactive OpenAPI and JSON Schema reference with AI search.
API Toolkit
OpenAPI, JSON Schema, and curated API tools.
OpenAPI FAQ
Answers to the most common OpenAPI questions.
JSON Schema FAQ
Answers to the most common JSON Schema questions.
Blog
Engineering writing on API docs, agents, and schema automation.
API Validator
Validate OpenAPI documents against the specification.
OAS Zod Validator
Generate Zod validators from OpenAPI 3.x specifications.
Frequently Asked Questions
What happened to Appear, what remains on this site, and where the idea continues.