How to connect Customjs to Hermes Agent
Connect Customjs to Hermes with ClawLink: paste your Customjs key once and 5 tools work from chat. No MCP server to run, nothing stored on your machine.
CustomjsAPI KEYMCPCustomJS is a code-first automation platform that enables seamless integration of custom JavaScript logic into various systems and technologies, allowing users to extend applications by writing functions for tasks like sending emails, generating PDFs, or updating CRM data fields.. Once connected, Hermes Agent can read and act on Customjs from chat — pairing, token refresh, and tool wiring handled for you.
Most guides for giving Hermes Agent Customjs access start with registering your own OAuth app or pasting API keys into env files, then leave the token refresh and tool wiring to you. ClawLink gives Hermes a more practical Customjs setup: pair once in the browser and your always-on Hermes agent can act on Customjs for you, reading and doing real work on your behalf with no auth, token refresh, or tool wiring to build yourself.
Setup
It takes three steps to connect Hermes to Customjs.
1Install and pair
Install the ClawLink plugin, then pair Hermes with a one-time browser approval:
hermes plugins install ClawLink-HQ/hermes-plugin --enable- 2
Connect Customjs
Paste your API key in the dashboard.
- 3
Use it from chat
Ask Hermes Agent: "What can you do with Customjs?"
Install by command
The prompt above walks Hermes through this. By hand, it is four commands and a browser approval:
hermes plugins install ClawLink-HQ/hermes-plugin --enable
hermes clawlink begin # prints an approval link — open it and approve
hermes clawlink finish # after approving in the browser
hermes clawlink testThen connect Customjs in the ClawLink dashboard — paste your Customjs API key once.
Verify the connection by asking Hermes:
Use Customjs to authenticate api key and walk me through the result in plain English.
Using a different agent?
The Hermes plugin is one client of ClawLink's MCP server. Claude Code, Cursor, Codex, or any agent that can run a shell command pairs with the same ClawLink account through the CLI:
npx -y @useclawlink/cli loginlogin opens the same browser approval and stores a credential locally. Once Customjs is connected in the dashboard, that agent calls the same 5 Customjs tools over MCP. Full setup for MCP clients and shell agents: connect apps to any AI agent.
Customjs MCP for Hermes
Looking for a Customjs MCP server for Hermes Agent? ClawLink connects Customjs to Hermes Agent and exposes 5 Customjs tools your agent can call over MCP, with hosted auth and nothing to run or maintain yourself. Using OpenClaw instead? The OpenClaw Customjs integration works the same way.
What the Hermes Agent Customjs integration can do
5 Customjs tools are ready for Hermes Agent once the account is connected.
All 5 Customjs tools for Hermes
| Tool | What it does |
|---|---|
Authenticate API key customjs_authenticate_api_key | Authenticate and validate a CustomJS API key |
Convert HTML to PDF customjs_convert_html_to_pdf | Convert HTML content to a PDF document |
Convert HTML to png customjs_convert_html_to_png | Convert HTML string to PNG image |
Merge pdfs customjs_merge_pdfs | Merge multiple PDF files from URLs into a single PDF document |
Run puppeteer script customjs_run_puppeteer_script | Execute a Puppeteer script in a headless browser and capture a screenshot |
Try it: find the Customjs tool you need
Browse the 5 Customjs tools
Click any tool to see exactly what Hermes can do and copy a ready-to-use prompt.
Example prompts
Use Customjs to authenticate api key and walk me through the result in plain English.
Use Customjs to convert html to pdf and walk me through the result in plain English.
Use Customjs to convert html to png and walk me through the result in plain English.
Use Customjs to merge pdfs and walk me through the result in plain English.
ClawLink vs. building it yourself
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want Customjs working from chat.
| Manual | ClawLink | |
|---|---|---|
| Credential handling | Collect, validate, store, and rotate the Customjs API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected Customjs account becomes available to the agent without you building credential management. |
| Ongoing maintenance | You own refresh logic, permission debugging, environment config, and every provider-specific edge case for Customjs. | ClawLink handles the repetitive integration plumbing so your team can focus on the workflow instead of the infrastructure. |
| Agent usability | You still need to expose the right Customjs actions to the runtime in a format your agent can reliably use. | 5 tools for Customjs are already exposed through ClawLink, so the agent can read and act from chat immediately. |
ClawLink vs. Composio
Composio also exposes Customjs to AI agents. It is developer infrastructure: Python and TypeScript SDKs, an MCP server, and a catalog past 1,000 apps, aimed at teams shipping agent products. ClawLink is built for Hermes Agent users instead. You install the plugin once, connect Customjs in the browser, and the 5 tools above work from chat. There is no SDK and no config file, and the Customjs key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full Composio alternatives comparison.
Troubleshooting
Hermes paired but still can't use Customjs
Pairing is a two-step handshake: run hermes clawlink begin, approve the link in your browser, then run hermes clawlink finish. If you ran finish before approving, or the approval link expired, run hermes clawlink begin again to get a fresh link. Confirm the plugin was installed with --enable, then verify with hermes clawlink test.
Connection succeeds but no tools appear
Reconnect Customjs from the dashboard, then start a fresh chat if the runtime still has the old tool catalog loaded.
"Tool schema not loaded yet" error when calling Customjs tools
Customjs tool schemas load on demand the first time a tool runs and are cached after that, so this error usually clears on its own: wait a few seconds and retry the same request. If every Customjs call keeps failing with it in a fresh chat, reconnect from the dashboard, and contact support if it still persists — that pattern points to a configuration problem on our side, not something you can fix by reconnecting again.
Customjs returns 403 or "permission denied" on one action while others work
Two usual causes. The connected account may not have access to the specific workspace, inbox, store, or project in the request — check that first. If access looks right, the agent may have sent a placeholder value (like "YOUR_ID" or an example id from documentation) instead of a real one: ask it to run a list or search tool first, then retry the action with a real id from those results. Most failures at this stage are one of these two, not ClawLink bugs.
API key setup works but results look incomplete
Double-check that the API key for Customjs has the right scopes or account access. A valid key can still be too limited for some reads or writes.
FAQ
Is there a Hermes Agent Customjs integration?
Yes. ClawLink is the fastest way to connect Hermes to Customjs: link your Customjs account once in the browser and Hermes Agent can call the Customjs API through 5 ready-made tools — no custom code or token handling.
How do I connect Customjs to Hermes with ClawLink?
Install the plugin with hermes plugins install ClawLink-HQ/hermes-plugin --enable, then pair once: run hermes clawlink begin, approve the link in your browser, and run hermes clawlink finish. Connect Customjs in the dashboard and Hermes can use it from the next message — no config files, and the Customjs key you paste is stored server-side instead of in your environment.
How long does it take to connect Customjs to Hermes Agent?
About two minutes. Sign in, click Connect next to Customjs in the dashboard, authenticate, and Hermes Agent can use it from the next chat message.
Why use ClawLink instead of wiring Customjs up myself?
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want Customjs working from chat.
Hermes paired but still can't use Customjs
Pairing is a two-step handshake: run hermes clawlink begin, approve the link in your browser, then run hermes clawlink finish. If you ran finish before approving, or the approval link expired, run hermes clawlink begin again to get a fresh link. Confirm the plugin was installed with --enable, then verify with hermes clawlink test.
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