Hythe

Name: Hythe
Author: hythe-dev

by hythe-devversion 0.2.0i★ 1iRuns on your computer

Registry namedev.hythe/hythe

How to install

What it does

HYTHE — coordination bus + shared truth for AI agent fleets — self-hosted MCP server + stdio bridge.

Connects Runs on your computer
Account or key Needs HYTHE_AGENT_AUTH_MODE, API_KEY · 1 setting to fill in (HYTHE_AGENT_ID)
Category Other

Install

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

Passed 3/3 checks · Runs on your computer · ✓ Commands checked Nov 14, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Let AI install it

Copy this message into a Claude chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Hythe for Claude on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "hythe": { "command": "npx", "args": [ "-y", "@hythe/mcp" ], "env": { "HYTHE_AGENT_ID": "your-value", "HYTHE_AGENT_AUTH_MODE": "your-value", "API_KEY": "your-value" } } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) For HYTHE_AGENT_AUTH_MODE, API_KEY, HYTHE_AGENT_ID, leave "your-value" in place and tell me to paste the real value myself into the file or the app’s field. Never ask me to type a key in chat. 5) Do what we agreed, then check that the Hythe tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Sign up and create a Hythe key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
3
Fill in 1 setting(s)
These are program settings, not keys. No sign-up needed; fill them in as the maker describes.
- HYTHE_AGENT_ID Stable exact agent identity for this client lane; required so restarts and compaction cannot adopt another principal
Descriptions are as written by the maker.
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "hythe": {
      "command": "npx",
      "args": [
        "-y",
        "@hythe/mcp"
      ],
      "env": {
        "HYTHE_AGENT_ID": "your-value",
        "HYTHE_AGENT_AUTH_MODE": "your-value",
        "API_KEY": "your-value"
      }
    }
  }
}

Paste the key only into the app’s field, never into a chat or to anyone

Done

Quit Claude and open it again
Done
Try it
Use Hythe and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Hythe or shows a Hythe tool in the answer, you are connected

3 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

HYTHE_AGENT_KEY_FILE Optional path to one protected per-agent credential file: regular, non-symlink, owned by the client user, mode 0400 or 0600, containing one hya1 token. Never place the token itself in an environment…
MCP_HOST HYTHE server host (default 127.0.0.1)
MCP_PORT HYTHE server port (default 6174)

Descriptions are as written by the maker.

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Hythe yet

Hythe runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Hythe

Steps for Claude →You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time)
Steps for Cursor →You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time)
Steps for VS Code →You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time)

B · Others in Other that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code, with some setup first

You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Claude Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Hythe for Claude Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): claude mcp add --scope user hythe --env HYTHE_AGENT_ID=your-value --env HYTHE_AGENT_AUTH_MODE=your-value --env API_KEY=your-value -- npx -y @hythe/mcp 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) For HYTHE_AGENT_AUTH_MODE, API_KEY, HYTHE_AGENT_ID, leave "your-value" in place and tell me to paste the real value myself into the file or the app’s field. Never ask me to type a key in chat. 5) Do what we agreed, then check that the Hythe tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Sign up and create a Hythe key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
3
Fill in 1 setting(s)
These are program settings, not keys. No sign-up needed; fill them in as the maker describes.
- HYTHE_AGENT_ID Stable exact agent identity for this client lane; required so restarts and compaction cannot adopt another principal
Descriptions are as written by the maker.
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
5
Paste this command and press Enter
```
claude mcp add --scope user hythe --env HYTHE_AGENT_ID=your-value --env HYTHE_AGENT_AUTH_MODE=your-value --env API_KEY=your-value -- npx -y @hythe/mcp
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see Hythe listed as connected
Done
Try it
Use Hythe and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Hythe or shows a Hythe tool in the answer, you are connected

3 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

HYTHE_AGENT_KEY_FILE Optional path to one protected per-agent credential file: regular, non-symlink, owned by the client user, mode 0400 or 0600, containing one hya1 token. Never place the token itself in an environment…
MCP_HOST HYTHE server host (default 127.0.0.1)
MCP_PORT HYTHE server port (default 6174)

Descriptions are as written by the maker.

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Cursor chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Hythe for Cursor on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "hythe": { "command": "npx", "args": [ "-y", "@hythe/mcp" ], "env": { "HYTHE_AGENT_ID": "your-value", "HYTHE_AGENT_AUTH_MODE": "your-value", "API_KEY": "your-value" } } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) For HYTHE_AGENT_AUTH_MODE, API_KEY, HYTHE_AGENT_ID, leave "your-value" in place and tell me to paste the real value myself into the file or the app’s field. Never ask me to type a key in chat. 5) Do what we agreed, then check that the Hythe tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Sign up and create a Hythe key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
3
Fill in 1 setting(s)
These are program settings, not keys. No sign-up needed; fill them in as the maker describes.
- HYTHE_AGENT_ID Stable exact agent identity for this client lane; required so restarts and compaction cannot adopt another principal
Descriptions are as written by the maker.
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the Hythe settings, HYTHE_AGENT_AUTH_MODE, API_KEY, HYTHE_AGENT_ID is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Hythe and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Hythe or shows a Hythe tool in the answer, you are connected

3 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

HYTHE_AGENT_KEY_FILE Optional path to one protected per-agent credential file: regular, non-symlink, owned by the client user, mode 0400 or 0600, containing one hya1 token. Never place the token itself in an environment…
MCP_HOST HYTHE server host (default 127.0.0.1)
MCP_PORT HYTHE server port (default 6174)

Descriptions are as written by the maker.

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

You need a Hythe key (create it on the maker’s site) · 1 setting(s) to fill in (HYTHE_AGENT_ID) · Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a VS Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Hythe for VS Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "servers": { "hythe": { "type": "stdio", "command": "npx", "args": [ "-y", "@hythe/mcp" ], "env": { "HYTHE_AGENT_ID": "your-value", "HYTHE_AGENT_AUTH_MODE": "your-value", "API_KEY": "your-value" } } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) For HYTHE_AGENT_AUTH_MODE, API_KEY, HYTHE_AGENT_ID, leave "your-value" in place and tell me to paste the real value myself into the file or the app’s field. Never ask me to type a key in chat. 5) Do what we agreed, then check that the Hythe tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Sign up and create a Hythe key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
3
Fill in 1 setting(s)
These are program settings, not keys. No sign-up needed; fill them in as the maker describes.
- HYTHE_AGENT_ID Stable exact agent identity for this client lane; required so restarts and compaction cannot adopt another principal
Descriptions are as written by the maker.
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the Hythe settings, HYTHE_AGENT_AUTH_MODE, API_KEY, HYTHE_AGENT_ID is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Hythe and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Hythe or shows a Hythe tool in the answer, you are connected

3 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

HYTHE_AGENT_KEY_FILE Optional path to one protected per-agent credential file: regular, non-symlink, owned by the client user, mode 0400 or 0600, containing one hya1 token. Never place the token itself in an environment…
MCP_HOST HYTHE server host (default 127.0.0.1)
MCP_PORT HYTHE server port (default 6174)

Descriptions are as written by the maker.

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Hythe💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user hythe --env HYTHE_AGENT_ID=your-value --env HYTHE_AGENT_AUTH_MODE=your-value --env API_KEY=your-value -- npx -y @hythe/mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "hythe": {
      "command": "npx",
      "args": [
        "-y",
        "@hythe/mcp"
      ],
      "env": {
        "HYTHE_AGENT_ID": "your-value",
        "HYTHE_AGENT_AUTH_MODE": "your-value",
        "API_KEY": "your-value"
      }
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "hythe": {
      "command": "npx",
      "args": [
        "-y",
        "@hythe/mcp"
      ],
      "env": {
        "HYTHE_AGENT_ID": "your-value",
        "HYTHE_AGENT_AUTH_MODE": "your-value",
        "API_KEY": "your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "hythe": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@hythe/mcp"
      ],
      "env": {
        "HYTHE_AGENT_ID": "your-value",
        "HYTHE_AGENT_AUTH_MODE": "your-value",
        "API_KEY": "your-value"
      }
    }
  }
}

Values you fill in

HYTHE_AGENT_ID required env
Stable exact agent identity for this client lane; required so restarts and compaction cannot adopt another principal
HYTHE_AGENT_KEY_FILE env
Optional path to one protected per-agent credential file: regular, non-symlink, owned by the client user, mode 0400 or 0600, containing one hya1 token. Never place the token itself in an environment…
HYTHE_AGENT_AUTH_MODE secret required env
Client authorization expectation: observe, mixed, or required (default observe). Move to mixed and then required only after this exact lane has a credential and passes /agent/whoami.
API_KEY secret required env
Shared API key authenticating the bridge to your self-hosted HYTHE server (create a protected .env with: npx -y @hythe/mcp@0.2.0 init --write-env --agent-id )
MCP_HOST env
HYTHE server host (default 127.0.0.1)
MCP_PORT env
HYTHE server port (default 6174)

Descriptions are as written by the maker.

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

At a glance

GitHub stars i: 1
Downloads per weeki: 62/wk
Verified domain: ✓ hythe.dev
Licence i: Apache-2.0
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.2.0
Categoryi: Other
Published to registryi: Sep 5, 2026
Code last changedi: Sep 5, 2026
Maker: hythe-dev
Packages: npm: @hythe/mcp
Repo: hythe-dev/hythe
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

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 15, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain hythe.dev (the registry checks domain ownership)
✓ Pass
Still maintained
Code last changed 2 months ago
✓ Pass
Has a licence
Uses Apache-2.0
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Published vulnerabilities (OSV.dev)

Not checked yet

What we check → · JSON

Makers: ask for a re-check or report wrong info

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 86% of the other 19900 servers in this category
Published to the registry more recently than 29% of the other 19900 servers in this category
Basic checks equal to or better than 100% of the other 19900 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 Hythe safe?

It passed 3 of 3 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: HYTHE_AGENT_AUTH_MODE, API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 2 months ago, and the latest version (0.2.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: World Monitor, openstatus, Oh My Posh Validator, Strata, Jitsu

Similar alternatives

Same category, other makers, commands already checked. Official ones first, then by stars.

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

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 97 tools.

by koala73Widely used★ 90.7KUpdated yesterday

Runs in the cloud✓ service owner · worldmonitor.app

How to connect

openstatus

Manage monitors, status pages, incidents and maintenances in your openstatus workspace.

by openstatusHQWidely used★ 9.3KUpdated 2 months ago

Runs in the cloud✓ service owner · openstatus.dev

How to connect

Oh My Posh Validator

Validate oh-my-posh configurations and segment snippets against the official schema.

by JanDeDobbeleerWidely used★ 23.8K Stars for the whole repoUpdated 26 days ago

Runs in the cloud✓ service owner · ohmyposh.dev

How to connect

Strata

MCP server for progressive tool usage at any scale (see https://klavis.ai)

by Klavis-AIGrowing★ 5.8KUpdated 14 months ago

Runs in the cloudRepo archived✓ klavis.ai

How to connect

Jitsu

Manage Jitsu data pipelines: destinations, streams, connections, functions, live events.

by jitsucomWidely used★ 5.1KUpdated 4 months ago

Runs in the cloud✓ service owner · jitsu.com

How to connect

World Monitor — Runs in the cloud, nothing to install · No key needed
openstatus — Runs in the cloud, nothing to install · No key needed
Oh My Posh Validator — Runs in the cloud, nothing to install · No key needed
Strata — Runs in the cloud, nothing to install · No key needed
Jitsu — Runs in the cloud, nothing to install · No key needed

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.

HYTHE

A coordination bus + shared truth for your agent fleet. Self-hosted, two-component setup: a dockerized server plus a thin stdio bridge for your MCP clients.

HYTHE is an MCP server that lets multiple AI coding agents — Claude Code, Codex, Cursor, custom harnesses — share state, preserve context across sessions, and coordinate with each other. It is not another memory store. Its differentiators:

Supersession + current-state resolution: observations supersede each other (replace-current), and get_current_observation resolves the chain server-side — so readers get the newest non-superseded state. Conflict handling is implemented: checkpoint is branch-preserving CAS — concurrent writers branch rather than overwrite, and conflicts surface as heads, never silently resolved (contract-tested; see the evidence ledger).
Agent messaging with a tracked delivery lifecycle: direct and capability-based sends, message supersession, read-state as a shared signal, atomic ack+archive. (Described as *tracked lifecycle*, not guaranteed delivery — the states are honest about what the server knows.)
The Adaptive Coordination Protocol (ACP): the ETA-driven coordination discipline that co-evolved with the server — published as docs/SPEC.md with a real two-harness worked tutorial.

Documentation

Doc	What it covers
Quickstart	Clean machine → two coordinating agents in ~15 minutes
Concepts	One current truth, messaging lifecycle, resume/checkpoint, honest security model
Checkpoint / resume v3	Current-head pointer, reconciliation, record / patch, the v3 read model, and the one-time adoption step for scopes written before v3
ACP SPEC	The coordination protocol, versioned (1.0.0)
Tutorial	Annotated transcript of a real Claude Code ↔ Codex review loop from the original Engram deployment
Tool compatibility map	The 20-tool v1 surface; every retired tool and its exact replacement
Backup & restore	Tested SQLite backup/restore/compaction runbook
Agent credential operator	Offline issuance, attestation, promotion, rotation, and revocation
Private-residue adjudication	Hash-bound, owner-approved disposition of ambiguous historical rows
SQLite physical sanitation	Verified offline VACUUM and no-clobber promotion after logical cleanup
Pavilion production	Pinned deployment, readiness, shutdown, canary, and rollback contract

Status

Version 0.2.0. This source tree and package define the reviewed 0.2.0 release. Version 0.2.0 preserves 0.1.7's dual-proof agent authorization, exact-mailbox/private-payload containment, bounded related-context discovery, latency-SLO recovery and the offline adjudicator, and adds checkpoint / resume resultVersion: 3: an explicit current-head pointer per scope, a reconcile operation that folds live heads into one survivor and resolves divergent values causally, append-only verified fact/loop versions, a read model that only promotes values proven on the accepted lineage, and record / patch operations on the pointed head. Every v1 / v2 request and result shape is frozen; v3 is opt-in per call, so a 0.1.7 client keeps working against a 0.2.0 server. The dependency tree moved to Express 5, clearing two moderate qs advisories. This release runs on the reference production host since 2026-09-05. All 0.2.0 rollout configurations pin @hythe/mcp@0.2.0; verify that the registry returns that exact version before production use. The predecessor @tomcat65/engram-mcp and io.github.tomcat65/engram remain available as compatibility history and are never unpublished. See CHANGELOG.md and the v3 guide.

House rule: every claim in these docs must trace to a test or a measurement (see the evidence ledger below). Claims that don't are bugs.

Evidence ledger

Claim	Evidence	Source	Date
Tree green, full gates	Source and clean installed-package gates cover 49 Vitest files (530 passed, 2 skipped, 6 explicit todos), 107 migration checks, 43 release-tree checks, 31 agent-kit checks, zero production npm audit findings, registry validation, and an isolated Docker start/readiness/MCP/WebSocket/graceful-shutdown canary.	`.github/workflows/ci.yml`, `tests/`, `src/migrations/`, `clients/agent-kit/tests/test-setup.sh`, `scripts/verify-hythe-release-tree.test.mjs`, `scripts/verify-packed-consumer.mjs`	2026-08-14
Compaction identity fails closed	Startup and post-compaction hooks reject missing, conflicting, or invalid identity; the bridge binds acting tools and message-resource recipients to the configured exact lane before any HTTP request.	`clients/agent-kit/tests/test-setup.sh`, `tests/contract-bridge-identity.test.ts`	2026-08-13
Exact mailboxes stay isolated	Houston/Hythe, case variants, display metadata, legacy identity history, cross-tenant poisoning, suffix handles, lifecycle changes, supersession, HTTP, and ENG-4 authorship have negative isolation coverage.	`tests/contract-message-identity-isolation.test.ts`, `tests/contract-eng4-p0.test.ts`	2026-08-13
Private message bodies stay out of shared graph surfaces	Historical, oversized, malformed, alias-linked, relation-linked, imported, exported, searched, graphed, logged, and restored payload paths are covered; hidden children do not leak through counts.	`tests/contract-message-payload-isolation.test.ts`, `tests/contract-data-payload-isolation.test.ts`, `tests/contract-log-confidentiality.test.ts`	2026-08-13
Cleanup is offline and fail-closed	Migration 007, owner-approved adjudication, and physical sanitation are dry-run/plan-first, bind execution to reviewed database and decision evidence, require verified no-clobber artifacts, refuse unresolved custody, and preserve rollback state.	`src/migrations/007-private-message-residue.mjs`, `src/migrations/private-message-residue-adjudication.mjs`, `src/migrations/vacuum-sanitized-database.mjs`, `docs/`	2026-08-14
Per-agent authority is server-derived	The base key proves deployment/tenant access; a separate protected-file `hya1` credential proves the exact agent. Required mode rejects stripped proof, mismatched identity, insufficient scope, revoked credentials, and stale WebSocket sessions.	`src/agent-auth/`, `tests/contract-agent-auth-foundation.test.ts`, `tests/contract-agent-auth-server.test.ts`, `tests/contract-agent-key-client.test.ts`	2026-08-14
Install and discovery surfaces agree	CLI and registry surfaces require an exact lane identity and expose only a protected per-agent key-file path plus an explicit authorization mode; tools and resource templates served through HTTP match the stdio bridge path.	`tests/contract-cli.test.ts`, `tests/contract-agent-key-client.test.ts`, `tests/contract-mcp-resources-http.test.ts`, `scripts/verify-hythe-release-tree.test.mjs`	2026-08-14
Current head is explicit, never guessed	The pointer advances only from the pointed head; stale parents branch without becoming current; a pointer at a non-live snapshot fails closed; snapshot rows are immutable by trigger. 33 contract tests.	`tests/contract-eng4-h1-head-pointer.test.ts`	2026-09-03
Versions and coverage are exact and verified	Every ledger tuple gets exactly one disposition; the startup backfill is all-or-nothing and idempotent; a bidirectional parity verifier fails closed on any missing, extra or mismatched row. 32 contract tests.	`tests/contract-eng4-h2-version-foundation.test.ts`	2026-09-03
Reconciliation is CAS-bound and causal	Exact live-head set and pointer are compare-and-set; every non-survivor head is retired (never deleted); divergent values resolve only by bound accept, reject or lineage reject; the record is payload-bound and re-verified on replay and read. 34 contract tests.	`tests/contract-eng4-h3-reconcile.test.ts`	2026-09-04
The v3 read model promotes only proven values	`currentFacts` / `openLoops` come only from verified versions on the accepted lineage with provenance; everything else is accounted as divergent or legacy with closed coverage. 29 contract tests.	`tests/contract-eng4-h4-read-model.test.ts`	2026-09-04
record / patch cannot promote stale state	Only the pointed head is admitted (conflict otherwise); state is materialized from the hash-verified payload; each payload is read once per call; snapshot resources serve exactly the verified bytes. 21 contract tests, four review rounds.	`tests/contract-eng4-h5-record-patch.test.ts`	2026-09-04
Express 5 keeps the HTTP contract	A bodiless or wrong-content-type request is handled like an empty JSON body on every parsed route, never a framework 500; production audit reports zero findings.	`tests/contract-express5-body-contract.test.ts`, `.github/workflows/ci.yml` run 33878587010	2026-09-04
Production migration verified on a copy first	The v3 schema and backfill were exercised against a copy of the production database on the production host before cutover; the live cutover took 17 s with row counts identical to the verified cold backup.	`docs/PAVILION-PRODUCTION.md`; operator log `engram-prod/releases/hythe-74a324c-cutover-20260905T005551Z.log` on the host	2026-09-05

v1 surface (short)

Install (two-component setup): server via docker compose up, then the @hythe/mcp stdio bridge per MCP client; first-run wizard stores the API key in a protected .env and prints secret-free file-referencing config for Claude Code / Codex / Cursor / Claude Desktop; optional namespaced (demo-*) demo seed on an otherwise empty DB.
Knowledge graph: entities, observations, relations, supersession, current-state resolution, conflict surfacing.
Related-context discovery: exact scope anchoring plus automatic bounded vector retrieval and graph-path reranking, with currentness/evidence/provenance explanations and no implicit writes.
Agent messaging: direct, capability-based, superseding; tracked delivery lifecycle.
`resume` / `checkpoint`: budgeted one-call session rehydration with closed coverage accounting, and CAS-protected, branch-preserving structured state capture. With resultVersion: 3: an explicit current-head pointer, reconcile to fold heads and resolve divergent values, verified fact/loop versions with provenance, and record / patch on the pointed head — see the v3 guide.
ACP: the coordination protocol as a versioned spec + real worked example.

Embedding runtime contract

The published npm package does not install a transformer engine by default. Without one, HYTHE still provides deterministic 384-dimension token-hash vectors plus lexical ranking; it does not download a model or create a model cache. @xenova/transformers@2.17.2 is an optional peer for operators who deliberately provide it from their own audited dependency root.

The Docker image keeps semantic behavior stable through a separate, locked /opt/hythe-transformers runtime. Its startup preflight loads the configured Xenova/all-MiniLM-L6-v2 q8 model and requires one finite 384-dimension embedding before the server starts. When SQLITE_VEC_ALLOW_REMOTE_MODELS=false, the configured SQLITE_VEC_CACHE_DIR must already contain that model. Do not switch between transformer and hash embeddings on a populated vector index: retain the same provider/model/dimensions or rebuild the vector index first.

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