# Context7 review

> Context7 is a documentation service that feeds up-to-date, version-specific library docs and code examples into AI coding agents through a CLI or MCP server.

Devtoolwatch Board, the week of Oct 25–31, 2026. Canonical page: https://index.devtoolwatch.com/tools/context7/

## TL;DR

Context7 pulls current, version-specific documentation and code examples from the source into a coding agent's context. It is for developers using agents like Claude Code, Cursor, Codex, or OpenCode who get outdated or hallucinated API answers. Context7 works either as a CLI plus agent skill or as an MCP server.

## Context7 at a glance

- **Category:** [MCP and agent tools](https://index.devtoolwatch.com/categories/mcp-servers/)
- **Maintained by:** Upstash (organization, [@upstash](https://github.com/upstash) on GitHub)
- **License:** MIT
- **Language:** TypeScript, JavaScript, Dockerfile
- **Repository:** [github.com/upstash/context7](https://github.com/upstash/context7)
- **Website:** [context7.com](https://context7.com)
- **npm package:** [@upstash/context7-mcp](https://www.npmjs.com/package/@upstash/context7-mcp) 4.4.4
- **Latest release:** [mcpb-v4.4.4](https://github.com/upstash/context7/releases/tag/mcpb-v4.4.4) on GitHub, Oct 19, 2026
- **First published:** Mar 26, 2025

## What Context7 does

- Context7 fetches up-to-date, version-specific documentation and code examples and places them in your coding agent's context.
- Context7 matches the library version you mention in a prompt, such as Next.js 16, and returns docs for that version.
- Context7 accepts a library ID like /supabase/supabase in the prompt to skip the library-matching step.
- Context7 exposes MCP tools resolve-library-id and query-docs, with an optional language parameter to rank code examples.
- Context7 offers CLI commands ctx7 library and ctx7 docs to search the index and retrieve documentation without MCP.
- Context7 publishes a TypeScript SDK, Vercel AI SDK tools, and a pi.dev extension as npm packages.

### How it works

Context7 runs in two modes. In CLI + Skills mode, a skill guides your agent to call ctx7 CLI commands. In MCP mode, your agent connects to the Context7 MCP server at https://mcp.context7.com/mcp and calls documentation tools natively, passing an API key in an Authorization header. The API backend, parsing engine, and crawling engine are private services.

## How to install Context7

**Guided setup**

```
npx ctx7 setup
```

**Global CLI install**

```
npm install -g ctx7
```

**Remove generated setup**

```
npx ctx7 remove
```

### Requirements

- The ctx7 CLI requires Node.js 22.13 or newer.
- The @upstash/context7-mcp package requires Node.js 20.18.1 or newer.
- An API key is recommended for higher rate limits and is available free at context7.com/dashboard.
- An MCP-compatible client or a supported coding agent such as Cursor, Claude Code, or OpenCode.

### First steps

1. Run npx ctx7 setup to authenticate via OAuth, generate an API key, and install the skill.
2. Choose CLI + Skills or MCP mode, and add --cursor, --claude, or --opencode to target a specific agent.
3. Add "use context7" to a prompt, or name a library ID such as /vercel/next.js.
4. Optionally add a rule in Cursor Settings > Rules or CLAUDE.md so the agent uses Context7 automatically.

## Who Context7 is for

- Developers whose coding agents produce outdated code or hallucinated APIs for the libraries they use.
- Users of Claude Code, Cursor, Codex, or OpenCode who want library docs fetched inside the agent.
- Developers working against specific library versions who need version-matched documentation.
- Teams building agents with the Vercel AI SDK or TypeScript who want documentation lookup tools.

### Limitations

- Context7's library docs are community-contributed, and the project does not guarantee their accuracy, completeness, or security.
- Context7's API backend, parsing engine, and crawling engine are private; the repository hosts only the MCP server source.
- Context7 applies rate limits; an API key is recommended to get higher limits.
- Context7 retrieves docs from its hosted service, so lookups depend on that service rather than running fully offline.

## Usage data (the week of Oct 25–31, 2026)

- Board rank: #299 overall, #48 in MCP and agent tools, momentum score 31
- Downloads that week: 580.8k (−30% vs 4-week average)
- New GitHub stars per week (last 12 weeks): Aug 9: 385; Aug 16: 312; Aug 23: 332; Aug 30: 298; Sep 6: 303; Sep 13: 317; Sep 20: 269; Sep 27: 232; Oct 4: 290; Oct 11: 381; Oct 18: 436; Oct 25: 441

## Context7 alternatives

| Rank | Tool | Stars | Downloads/wk |
|---|---|---|---|
| #1 | [REA](https://index.devtoolwatch.com/tools/morluto-rea/) | 415.5k | 760.6k |
| #2 | [ha-mcp](https://index.devtoolwatch.com/tools/homeassistant-ai-ha-mcp/) | 5.4k | 118.1k |
| #3 | [Treg](https://index.devtoolwatch.com/tools/superdesigndev-treg/) | 6.9k | 6.7k |
| #4 | [Chrome DevTools MCP](https://index.devtoolwatch.com/tools/chrome-devtools-mcp/) | 54.6k | 2.7M |
| #5 | [codebase-memory-mcp](https://index.devtoolwatch.com/tools/deusdata-codebase-memory-mcp/) | 47.9k | – |
| #6 | [open-computer-use](https://index.devtoolwatch.com/tools/ifuryst-open-computer-use/) | 2.8k | – |

## Context7 FAQ

### Is Context7 free and open source?

Yes. Context7's source code is on GitHub (upstash/context7) under the MIT license, so you can use it for free.

### How do I install Context7?

Run `npx ctx7 setup`. It needs Node.js >=20.18.1. The install section above has the other options from the project's README.

### Is Context7 still maintained?

Yes. The upstash/context7 repository was last updated on Oct 21, 2026, and the latest release, mcpb-v4.4.4 on GitHub, came out on Oct 19, 2026.

### How popular is Context7?

Context7 has 64k GitHub stars as of Nov 1, 2026. It gained 441 new stars in the week of Oct 25–31, 2026, against a 12-week average of 333 a week. Its main package had about 580.8k downloads that week, −30% against its own 4-week average. That made it #48 among MCP servers and agent tools on the Devtoolwatch Board.

### Context7 vs Serena: how do they compare?

Context7 and Serena are both tracked by Devtoolwatch as MCP servers and agent tools. Context7 has 64k GitHub stars and Serena has 31k. In the week of Oct 25–31, 2026, Context7's main package had 580.8k downloads and Serena's had 35k. Serena is an MCP toolkit that gives coding agents semantic, symbol-level code retrieval, editing, refactoring and debugging tools, similar to an IDE. [Serena review](https://index.devtoolwatch.com/tools/serena/)

### Context7 vs Graphify: how do they compare?

Context7 and Graphify are both tracked by Devtoolwatch. Context7 has 64k GitHub stars and Graphify has 140k. In the week of Oct 25–31, 2026, Context7's main package had 580.8k downloads and Graphify's had 480.7k. Graphify is an AI coding assistant skill that turns a codebase, with its docs, PDFs, images and videos, into a queryable knowledge graph. [Graphify review](https://index.devtoolwatch.com/tools/graphify-labs-graphify/)

### What are the best alternatives to Context7?

Other MCP servers and agent tools on the Devtoolwatch Board in the week of Oct 25–31, 2026, by momentum: REA (#1), ha-mcp (#2), Treg (#3), Chrome DevTools MCP (#4), codebase-memory-mcp (#5). The alternatives table above has their numbers.

### How do I use Context7 with Claude Code?

Run npx ctx7 setup with the --claude flag to install the skill or MCP config. Then add "use context7" to prompts, or add a rule in CLAUDE.md telling Claude Code to always use Context7 for library and API documentation.

### How do I use Context7 in Cursor?

Run npx ctx7 setup --cursor, or configure Cursor's MCP client with the server URL https://mcp.context7.com/mcp and an Authorization: Bearer header. To trigger it automatically, add a rule under Cursor Settings > Rules.

### How do I use the Context7 MCP server with other clients?

Point your MCP client at https://mcp.context7.com/mcp and pass your API key via the Authorization: Bearer YOUR_API_KEY header. Context7's docs list manual setup instructions for 30+ clients.

### Does Context7 require MCP?

No. Context7 has a CLI + Skills mode that installs a skill guiding your agent to fetch docs with ctx7 CLI commands, with no MCP required. MCP mode is the alternative.

### Is Context7 safe to rely on?

Context7 states that library documentation is community-contributed and that it cannot guarantee accuracy, completeness, or security. Libraries are maintained by their owners, and users can report suspicious content with the Report button on a project page.

### Is Context7 open source?

Partly. The repository hosting the MCP server source code is MIT licensed. The supporting API backend, parsing engine, and crawling engine are private and not part of the repository.

## Sources

1. [upstash/context7 on GitHub](https://github.com/upstash/context7)
2. [Context7 README](https://github.com/upstash/context7/blob/master/README.md)
3. [@upstash/context7-mcp on npm](https://www.npmjs.com/package/@upstash/context7-mcp)
4. [Context7 website](https://context7.com)
5. [Release mcpb-v4.4.4 (Oct 19, 2026)](https://github.com/upstash/context7/releases/tag/mcpb-v4.4.4)
6. [Release @upstash/context7-mcp@4.4.4 (Oct 19, 2026)](https://github.com/upstash/context7/releases/tag/%40upstash/context7-mcp%404.4.4)
7. [Release ctx7@0.8.1 (Oct 19, 2026)](https://github.com/upstash/context7/releases/tag/ctx7%400.8.1)
8. [Devtoolwatch Board, the week of Oct 25–31, 2026](https://index.devtoolwatch.com/)