# How to connect Postal Data API to Hermes Agent (paste one key, 6 tools) > Connect Postal Data API to Hermes with ClawLink: paste your Postal Data API key once and 6 tools work from chat. No MCP server to run, nothing stored on your machine. Web version: https://claw-link.dev/hermes/postal-data-api Most guides for giving Hermes Agent Postal Data API 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 Postal Data API setup: pair once in the browser and your always-on Hermes agent can act on Postal Data API 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 Postal Data API. 1. **Install ClawLink** — add the plugin to Hermes Agent once. 2. **Connect Postal Data API** — one-click OAuth in the ClawLink dashboard. 3. **Use it from chat** — ask Hermes Agent in plain English. **Paste this into Hermes to set up ClawLink:** > Set up ClawLink for Hermes and tell me when it's ready. > 1. Install the plugin: `hermes plugins install ClawLink-HQ/hermes-plugin --enable` > 2. Start pairing with `hermes clawlink begin`. It prints an approval link, so show me the link and stop, don't wait. > 3. I'll approve it in my browser, then reply "approved". > 4. When I say approved, finish setup: `hermes clawlink finish` > 5. Then run `hermes clawlink test` and tell me whether ClawLink is ready. **Alternative for any agent (no plugin needed):** if the Hermes Agent plugin route isn't available or doesn't work, any AI agent with shell access can use the ClawLink CLI instead: ```bash npx -y @useclawlink/cli login # sign in via browser — no API key to paste npx -y @useclawlink/cli connect postal-data-api # connect Postal Data API (browser OAuth) npx -y @useclawlink/cli actions postal-data-api # list available actions npx -y @useclawlink/cli run postal-data-api --input '' # execute (add --confirm for writes) ``` ### Install by command The prompt above walks Hermes through this. By hand, it is four commands and a browser approval: ```bash 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 test ``` Then connect Postal Data API in the [ClawLink dashboard](https://claw-link.dev/dashboard) — paste your Postal Data API API key once. Verify the connection by asking Hermes: > Pull the relevant data from Postal Data API, summarize it in plain English, and point out anything that needs attention. ### 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: ```bash npx -y @useclawlink/cli login ``` `login` opens the same browser approval and stores a credential locally. Once Postal Data API is connected in the dashboard, that agent calls the same 6 Postal Data API tools over MCP. Full setup for MCP clients and shell agents: [connect apps to any AI agent](https://claw-link.dev/learn/connect-apps-to-any-ai-agent). ## Postal Data API MCP for Hermes Looking for a Postal Data API MCP server for Hermes Agent? ClawLink connects Postal Data API to Hermes Agent and exposes 6 Postal Data API tools your agent can call over [MCP](https://claw-link.dev/learn/what-is-an-mcp-server), with [hosted auth](https://claw-link.dev/learn/oauth-for-ai-agents) and nothing to run or maintain yourself. Using OpenClaw instead? The [OpenClaw Postal Data API integration](https://claw-link.dev/openclaw/postal-data-api) works the same way. ## What the Hermes Agent Postal Data API integration can do 6 Postal Data API tools are ready for Hermes Agent once the account is connected. ### All 6 Postal Data API tools for Hermes | Tool | What it does | |---|---| | **Get API information** `postal_data_api_get_api_information` | Return Postal Data API version, coverage, usage guidance, current balance, and configured | | **Get postal code metadata** `postal_data_api_get_postal_code_metadata` | Return all available country-specific metadata for a postal code, such as coordinates | | **Lookup postal code** `postal_data_api_lookup_postal_code` | Look up the city, region, and coordinates for a postal code | | **Search postal codes by city** `postal_data_api_search_postal_codes_by_city` | Return all postal codes matching a city and optional region, including fuzzy-match details | | **Validate postal code** `postal_data_api_validate_postal_code` | Check whether one postal code exists without treating a nonexistent code as an execution error | | **Validate postal codes bulk** `postal_data_api_validate_postal_codes_bulk` | Validate 1 to 1,000 postal codes synchronously, including mixed-country batches | ## Example prompts **Get Api Information** > Pull the relevant data from Postal Data API, summarize it in plain English, and point out anything that needs attention. **Get Postal Code Metadata** > Pull the relevant data from Postal Data API, summarize it in plain English, and point out anything that needs attention. **Lookup Postal Code** > Use Postal Data API to lookup postal code and walk me through the result in plain English. **Search Postal Codes By City** > Search Postal Data API for what I need, summarize the results, and tell me the next best action. ## 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 Postal Data API working from chat. | | Manual | ClawLink | |---|---|---| | **Credential handling** | Collect, validate, store, and rotate the Postal Data API API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected Postal Data API 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 Postal Data API. | 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 Postal Data API actions to the runtime in a format your agent can reliably use. | 6 tools for Postal Data API are already exposed through ClawLink, so the agent can read and act from chat immediately. | ## ClawLink vs. Composio Composio also exposes Postal Data API 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 Postal Data API in the browser, and the 6 tools above work from chat. There is no SDK and no config file, and the Postal Data API key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full [Composio alternatives](https://claw-link.dev/hub/composio-alternatives) comparison. ### Hermes paired but still can't use Postal Data API 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 Postal Data API 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 Postal Data API tools Postal Data API 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 Postal Data API 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. ### Postal Data API 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 Postal Data API has the right scopes or account access. A valid key can still be too limited for some reads or writes. ### Is there a Hermes Agent Postal Data API integration? Yes. ClawLink is the fastest way to connect Hermes to Postal Data API: link your Postal Data API account once in the browser and Hermes Agent can call the Postal Data API API through 6 ready-made tools — no custom code or token handling. ### How do I connect Postal Data API 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 Postal Data API in the dashboard and Hermes can use it from the next message — no config files, and the Postal Data API key you paste is stored server-side instead of in your environment. ### How long does it take to connect Postal Data API to Hermes Agent? About two minutes. Sign in, click Connect next to Postal Data API in the dashboard, authenticate, and Hermes Agent can use it from the next chat message. ### Why use ClawLink instead of wiring Postal Data API 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 Postal Data API working from chat. ### Hermes paired but still can't use Postal Data API 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`. ## Related - [Connect GitHub](https://claw-link.dev/hermes/github) — Manage repositories, issues, pull requests, and workflows - [Hermes PagerDuty integration](https://claw-link.dev/hermes/pagerduty) — Manage incidents, on-call schedules, and services - [Hermes SafetyCulture integration](https://claw-link.dev/hermes/safetyculture) — SafetyCulture (formerly iAuditor) is a workplace operations platform that enables teams to conduct digital inspections, manage audits, track issues, schedule tasks, and maintain compliance through mobile and web applications.