Assertion Memory

Name: Assertion Memory
Author: Assertion-AI

by Assertion-AIversion 1.0.0i★ –iRuns in the cloud

Registry nameio.github.Assertion-AI/assertion

Install

Overview

Description from the maker (original English)

Recall your team's coding-agent memory. Install the Assertion plugin to capture it automatically.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Search & AI memory
You need to fill in: x-api-key

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
You fill in yourself: x-api-key

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.

Run this in your terminal

claude mcp add --transport http assertion https://memory.assertion-ai.com/memory/mcp --header 'x-api-key: your-value'

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "assertion": {
      "url": "https://memory.assertion-ai.com/memory/mcp",
      "headers": {
        "x-api-key": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "assertion": {
      "type": "http",
      "url": "https://memory.assertion-ai.com/memory/mcp",
      "headers": {
        "x-api-key": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

x-api-key secret required HTTP header
Your Assertion API key. Free account; get it at https://studio.assertion-ai.com/connect

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Assertion-AI, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Search & AI memoryi

More stars than 0% of the other 7208 servers in this category
Published to the registry more recently than 49% of the other 7208 servers in this category
Basic checks equal to or better than 100% of the other 7208 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Assertion Memory safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: x-api-key

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 41 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Context7

by upstash

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

Computer or cloud★ 64,224MITUpdated 3 days ago

Install

Codebase Memory

by DeusData

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

Runs on your computer★ 48,148MITUpdated 19 days ago

Install

Exa

by exa-labs

Connect AI agents to Exa for web search, content fetching, and multi-step research.

Runs in the cloud★ 5,213MITUpdated 44 days ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Assertion — a second brain for your codebase

Gives Claude Code, OpenAI Codex, and Cursor memory that remembers the *why* behind your decisions and the strategy across your project — and keeps it current, superseding calls you've reversed instead of resurfacing them. It recalls that context automatically as you work, into a shared, project-scoped tree. Reads run over a hosted MCP endpoint (no local server); small hooks handle capture and context injection. One codebase serves all three agents (single copy of the logic). By Assertion AI.

Memory keeps decisions and their reasons, not your transcripts or source code. What memory stores →

Install, then sign in once in your browser. There is no key to copy. Requires a system python3 (for the stdlib hooks); no other deps.

Step-by-step guides with troubleshooting for each tool: [assertion-ai.com/install](https://assertion-ai.com/install?src=github).

Install — Claude Code

Step-by-step guide: assertion-ai.com/install/claude-code.

Already installed? Keep the copy you have. If you installed from this repo (assertion@assertion-ai), don't also install it from the Claude Code community catalog (assertion@claude-community). Two copies means two sets of hooks, so every turn is captured twice. /assertion:upgrade updates whichever copy you have.

# 1) in Claude Code:

/plugin marketplace add Assertion-AI/assertion /plugin install assertion@assertion-ai /reload-plugins

`/reload-plugins` turns the plugin on in the session you're in, with no restart. Or install from

your terminal before you start Claude Code, and skip it: claude plugin marketplace add Assertion-AI/assertion && claude plugin install assertion@assertion-ai

2) Sign in:

/assertion:login

Your browser opens at Assertion Studio; click Connect (new here? sign up on that page first). Memory turns on in the same session: the memory tools and capture both pick up the sign-in, with no restart and no key to copy. Then try recall . Until you sign in, each session starts with a one-line notice that memory is off.

On a machine with no browser (SSH, a server), /assertion:login code shows a short code to confirm from any device instead. /assertion:logout signs this computer out and turns memory off.

Requirements: a system python3 (for the two stdlib hooks). No other deps — the memory tools connect over HTTP.

Using a key instead (CI, or a shared machine): ASSERTION_API_KEY still works and takes

precedence over the sign-in. Put it in ~/.claude/settings.json as

{"env": {"ASSERTION_API_KEY": " "}} rather than a shell export, so it reaches the plugin

however you launch Claude Code.

Upgrading: run /assertion:upgrade, then /reload-plugins. No restart needed.

Spaces: /assertion:space lists your memory spaces and shows which one this session uses;

/assertion:space switches this session only (/assertion:space personal to go back).

Install — OpenAI Codex

Step-by-step guide: assertion-ai.com/install/codex.

# 1) install the plugin

codex plugin marketplace add Assertion-AI/assertion codex plugin add assertion@assertion-ai

2) sign in in your browser (no key to copy)

python3 "$(ls -d ~/.codex/plugins/cache/*/assertion/*/scripts | sort -V | tail -1)/assertion.py" login --client codex

Or, once Codex is open, ask it to "sign in to Assertion" (the plugin's `assertion-login` skill runs

the same sign-in; "sign out of Assertion" runs assertion-logout). Either way the key is saved for the hooks and written into ~/.codex/config.toml for the memory tools.

Use Codex interactively (codex in a terminal, or the VS Code Codex panel — *not* codex exec). On first run, toggle the three hooks Trust on when prompted (once).

Capture + injection then work against the same shared tree, in CLI and VS Code. Full Codex details (recall/expand setup, dev override): plugin/codex/README.md.

Install — Cursor

Step-by-step guide: assertion-ai.com/install/cursor.

Cursor has no plugin marketplace, so it installs via a one-time script that wires its hooks.json + mcp.json for you:

git clone https://github.com/Assertion-AI/assertion

cd assertion/plugin/cursor && python3 install_cursor.py # signs you in in the browser

Then fully quit and reopen Cursor. The installer merges into any existing Cursor config

(it won't touch your other hooks or MCP servers), backs up what it changes, and defaults to prod + the shared default workspace. In Cursor, /assertion-login signs in again, /assertion-space lists or switches memory spaces, and /upgrade updates the clone. Options (--key, --workspace, --server, --uninstall) and a manual fallback: plugin/cursor/README.md.

What's included

MCP tools — query and curate your memory from inside the agent, over https://memory.assertion-ai.com:
recall — find past work relevant to what you're doing now
expand — open up a point to see the detail beneath it
evidence — see the supporting detail behind a claim
conflicts — surface where the record disagrees with itself
resolve — settle a conflict and keep the memory coherent
superseded — see what's been replaced as decisions changed
unsupersede — bring back something that was replaced
Stop hook — captures each finished turn into the tree.
SessionStart hook — injects the project's working-set into context.

Both hooks fail open: if the backend is unreachable, your session is never blocked.

Optional: show your memory space in the Claude Code status line

A permanent 📁 indicator at the bottom of your terminal — instant, local, per-session-accurate. In ~/.claude/settings.json:

"statusLine": {

"type": "command", "command": "python3 ~/.claude/plugins/cache/assertion-ai/assertion/scripts/statusline_space.py" }

(If you already have a statusline command, chain this after it.)

License

The plugin in this repository is licensed under the Apache License 2.0. See NOTICE.

The license covers this client code only. The hosted Assertion service it connects to is governed by the Terms of Service, and your data by the privacy notice. "Assertion" is a trademark of Assertion AI, Inc.

Assertion Memory

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Search & AI memoryi

Common questions

Alternatives

Context7

Codebase Memory

Exa

README from the maker

Assertion — a second brain for your codebase

Install — Claude Code

Install — OpenAI Codex

2) sign in in your browser (no key to copy)

Install — Cursor

What's included

Optional: show your memory space in the Claude Code status line

License