How to Connect PostgreSQL to Hermes
Query your PostgreSQL data directly from Hermes using Sequel’s MCP server. Ask questions in plain English, with no SQL, no dashboards, and no context switching.
Short answer
Connect PostgreSQL to Sequel, then add Sequel's MCP server to Hermes using the config on this page. Hermes can then query your live PostgreSQL data in plain English, with no connector code and no CSV exports. Both steps take a few minutes.
Everything you can ask Hermes about your PostgreSQL data.
Ask in plain English — Sequel translates it into a PostgreSQL query, runs it, and Hermes hands back the answer. No SQL, no dashboards, no CSV exports.
- How many rows are in each table?
- Show me the 10 most recently created users
- What's the average order value by customer segment?
- Which products have never been ordered?
- Show me monthly revenue broken down by plan type
How it works
Three steps to get started
Connect PostgreSQL to Sequel
In your Sequel dashboard, go to Connections and add PostgreSQL. Sequel handles authentication and schema discovery automatically.
Add Sequel to the agent
Copy the Sequel MCP configuration into Hermes's settings file (shown below). Swap in your API key from Settings → API Keys.
Ask Hermes about your data
Restart Hermes and start asking questions. "How many rows are in each table?" — and get a real answer backed by live PostgreSQL data.
Why Hermes
What Hermes does with your PostgreSQL data
An agent that grows into a data analyst
Hermes runs on your own hardware and gets better the more you use it. Point it at Sequel and it gains a durable new skill: answering data questions across your databases, warehouses, and SaaS tools in plain English.
One server, every source, joined on the fly
Sequel connects to databases, warehouses, product analytics, and ad platforms. Ask Hermes to line up Stripe revenue against Google Ads spend, or GA4 sessions against your Postgres signups, and the join happens at query time with no upstream data model.
Scope the tools, keep the keys safe
Hermes supports per-server tool filtering with include and exclude lists in its YAML config, so you choose exactly which Sequel tools the agent can call. Sequel runs read-only by default, and your database credentials stay encrypted in Sequel, never in the Hermes config.
Configuration
Add Sequel to Hermes
Place this in ~/.hermes/config.yaml and replace sql_your_api_key with a key from Settings → API Keys.
~/.hermes/config.yaml
mcp_servers:
sequel:
url: "https://api.sequel.sh/mcp"
headers:
Authorization: "Bearer sql_your_api_key"Install
Install PostgreSQL MCP in Hermes
Pick your app and Sequel installs itself: a one-click link where the client supports it, that client’s own few steps where it doesn’t. Every route signs in with your Sequel account over OAuth, so there is no API key to copy and nothing to keep in sync.
Claude, ChatGPT, Cursor, VS Code, Claude Code, Codex, Grok, Muse, dots and any other MCP app
Already have an MCP client?
https://api.sequel.sh/mcp
Add it as a remote (streamable HTTP) server and sign in when prompted. Skills come with it; nothing else to install. Manual setup per client
Choose your app
Claude
One click, opens in the app
Cursor
One click, opens in the app
VS Code
One click, opens in the app
ChatGPT
Turn on developer mode, then add Sequel. About two minutes.
Claude Code
Run one command, then sign in with /mcp.
Codex
Run one command, then sign in.
Gemini CLI
Run one command, then sign in with /mcp auth.
Grok
Add Sequel as a connector and sign in.
Grok Bot
Paste this to the bot. It registers Sequel and asks you to sign in.
Muse
Muse writes its own connector. One message is the whole setup.
dots
Add Sequel in ChatGPT; your dot picks it up with no extra step.
OpenCode
Add Sequel as a remote server from the OpenCode CLI.
Other MCP app
Any client that speaks remote MCP can connect with this URL.
Other AI agents
Connect PostgreSQL MCP to any agent
Claude
Use Claude to query your databases, explore schemas, and build analyses — all from one conversation.
Cursor
Query your databases and explore schemas without leaving your code editor.
ChatGPT
Connect ChatGPT to your databases and get data-backed answers in every conversation.
VS Code
Get database access inside VS Code Copilot without leaving your editor.
Windsurf
Give Windsurf's Cascade AI access to your databases — query data without leaving your editor.
Zed
Connect Zed's AI assistant to your databases for real-time data access while you code.
Gemini
Connect Google Gemini to your databases for grounded, data-backed answers.
Claude Code
Query your databases directly from the Claude Code CLI — without leaving your terminal.
Codex
Give OpenAI Codex CLI real-time database access for data-grounded coding sessions.
OpenClaw
Turn your self-hosted OpenClaw agent into a data analyst that queries every source you've connected.
Hermes
Give Nous Research's Hermes agent read access to every database and marketing tool you've connected.
Grok Bot
Tell your Grok bot to add Sequel and it can query every database and marketing tool you've connected.
Muse
Give Meta's Muse one message and it builds its own connector to every source you've put in Sequel.
dots
Add Sequel once in ChatGPT and your dot can answer data questions on its own, day and night.
Other data sources
Connect other sources to Hermes
MySQL
Instant insights from your MySQL database. Ask in plain English.
ClickHouse
Real-time analytics on ClickHouse at any scale, in plain English.
BigQuery
Query petabytes of BigQuery data in plain English.
Google Sheets
Query, write, and manage Google Sheets with AI.
Google Analytics 4
Ask your GA4 data anything. No SQL, no dashboards.
Google Search Console
Unlock your SEO data with natural language. No exports, no pivot tables.
MCP Server
Connect any MCP-compatible server and query it with AI in seconds.
Stripe
Ask your Stripe data anything. MRR, churn, refunds — answered in plain English.
Polar
Ask your Polar revenue, subscriptions, and usage data anything — in plain English.
Dodo Payments
Ask questions about payments, subscriptions, refunds and payouts in plain English.
PostHog
Ask your PostHog product data anything — with HogQL under the hood.
Mixpanel
Conversational analytics on your Mixpanel events, funnels, and retention.
Amplitude
Query your Amplitude taxonomy, funnels, and dashboards in plain English.
HubSpot
Your AI analyst for HubSpot contacts, deals, tickets, and pipelines.
Ahrefs
Ask your Ahrefs SEO data anything: backlinks, keywords, and traffic.
Apollo.io
Ask your Apollo.io prospects, contacts, and accounts anything, in plain English.
Cloudflare D1
Ask your Cloudflare D1 database questions in plain English.
Instagram organic analytics — post engagement, reach, and audience insights in plain English.
Frequently asked questions
How do I connect PostgreSQL to Hermes?
You need two things: (1) connect PostgreSQL to Sequel in your Sequel dashboard under Connections, and (2) add the Sequel MCP config to Hermes using the setup shown above. Once both are done, Hermes can query your PostgreSQL data directly.
What PostgreSQL data can Hermes access?
Hermes can access any data available through your PostgreSQL connection in Sequel. Use Sequel's search tool to discover available metrics and dimensions, then execute queries to pull the data you need.
Is my PostgreSQL data sent to Hermes's servers?
Query results are returned to Hermes as context within your conversation. Only the data you explicitly ask about is retrieved. Sequel never stores your query results permanently — they exist only for the duration of the tool call.
Do I need a Sequel account?
Yes. You need a Sequel account to connect PostgreSQL and generate an API key. Sign up free at sequel.sh — no credit card required. Then create a connection to PostgreSQL and generate an API key from Settings → API Keys.
Can I connect multiple PostgreSQL accounts?
Yes. Sequel supports multiple connections of the same type. If you have multiple PostgreSQL accounts or properties, add each as a separate connection in Sequel. Hermes will be able to query all of them.
How do I add Sequel to Hermes?
Add a `sequel` entry under `mcp_servers` in `~/.hermes/config.yaml` with Sequel's URL and your API key as an Authorization header, then run `/reload-mcp` in Hermes (or restart it). The Sequel CLI can write the config for you with `sequel install hermes`.
Which data sources can Hermes query through Sequel?
Any source you've connected in Sequel: PostgreSQL, MySQL, ClickHouse, BigQuery, Snowflake, Google Analytics, Search Console, Google Ads, Meta Ads, HubSpot, Stripe, and more. Hermes can only reach the connections your organization has set up.
Is Sequel a remote MCP server or a local command?
Remote. Sequel is hosted at https://api.sequel.sh/mcp, so in Hermes you configure it as an HTTP server with a `url` and an Authorization header, rather than a local stdio `command`.
Can I limit which Sequel tools Hermes can use?
Yes. Hermes supports per-server `tools` filtering with include and exclude lists in `config.yaml`. You can expose only the read and query tools you want a given agent to have.
How do I connect my PostgreSQL database?
Click 'New Connection', select PostgreSQL, and enter your host, port, database name, username, and password. Sequel will test the connection before saving. Make sure your database allows connections from Sequel's IP range.
Is my database connection secure?
All connections use SSL/TLS by default. Credentials are encrypted at rest and never exposed in query results or logs. Sequel uses a read-only connection by default and will not execute write statements.
Can Sequel modify my data?
No. Sequel is read-only by default and will warn you if a query could modify data. The agent is explicitly instructed never to run INSERT, UPDATE, DELETE, or DDL statements unless you explicitly request and confirm it.
What PostgreSQL versions are supported?
Sequel supports PostgreSQL 12 and above. Older versions may work but are not officially tested.
Connect PostgreSQL to Hermes today
Sign up free, connect your data sources, and start querying in minutes.