hermes-plivo-tools
Plivo tools for Hermes Agent. The agent sends text messages, places phone calls and looks up numbers through Plivo.
| Tool | Detail |
|---|---|
send_sms |
Sends a text message to a phone number |
make_call |
Places a call answered by Plivo call-control XML, for notifications and alerts |
lookup_number |
Returns carrier, country, line type and formatting details |
The plugin registers tools only. It hosts no server and registers no messaging platform, and runs anywhere a Hermes agent runs. Standard library only, with no third-party dependencies.
Requirements
| Hermes Agent | Python 3.11 or later |
| Plivo | An account, an SMS-capable number for send_sms, a voice-capable number for make_call |
Installation
1. Install
pip install hermes-plivo-tools
Installing hermes-plivo-phone-gateway brings the plugin in as a dependency.
2. Enable
hermes plugins enable plivo-tools
hermes tools list
Hermes is opt-in and loads no plugin until enabled. Each tool is its own toolset, listed as
plivo_send_sms, plivo_make_call and plivo_lookup_number, and each one can be enabled or
disabled separately.
3. Add credentials
In ~/.hermes/.env:
PLIVO_AUTH_ID=MAxxxxxxxxxxxxxxxxxx
PLIVO_AUTH_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
PLIVO_PHONE_NUMBER=+14155550100
The tools register whether or not credentials are present and refuse to dispatch without them, leaving the plugin safe to install before the account is configured.
Configuration
| Variable | Required | Purpose |
|---|---|---|
PLIVO_AUTH_ID |
yes | Plivo account auth ID |
PLIVO_AUTH_TOKEN |
yes | Plivo account auth token |
PLIVO_PHONE_NUMBER |
yes | Default sender and caller ID, E.164 |
PLIVO_ANSWER_URL |
no | Default document returning call-control XML for make_call. Plivo's demo document answers when absent |
Credentials are read through the Hermes profile-scoped secret store, with an environment fallback, matching the bundled plugins.
What an outbound call says
make_call needs a Plivo answer URL, a fetchable document returning call-control XML. The
Plivo API accepts no inline text and rejects a data: URI.
With none configured, calls reach Plivo's demo document, which speaks a single fixed sentence. The tool result carries a warning whenever the demo document answers.
| To control what is said | Result |
|---|---|
| Install hermes-plivo-phone-gateway | The agent answers the call and holds a real-time conversation |
Pass answer_url and answer_method |
Whatever the document returns, for example <Response><Speak>Deploy finished</Speak></Response> |
Set PLIVO_ANSWER_URL in ~/.hermes/.env |
The same, applied to every call |
Security
- Credentials are read from the Hermes secret store or the environment, never from a file the plugin ships
- Phone numbers in tool results are masked to their last four digits
- Failures return structured JSON rather than raising, and a failed send leaves the agent turn intact
Troubleshooting
| Symptom | Cause |
|---|---|
Agent has no send_sms, make_call or lookup_number |
The plugin is not enabled as plivo-tools |
| Only some of the three appear | Each tool is its own toolset and can be disabled separately |
| A call speaks one fixed sentence | No answer URL is configured, and Plivo's demo document answered |
| A tool reports missing credentials | PLIVO_AUTH_ID or PLIVO_AUTH_TOKEN is unset in ~/.hermes/.env |
Tests
python -m unittest discover -s tests
ruff check .
The suite covers number normalisation, credential handling, schema shapes and the handler contract with the REST layer stubbed. It needs no Hermes install and touches no network.
Limitations
make_callon its own plays a fixed document. A spoken conversation needshermes-plivo-phone-gateway- Inbound SMS is a separate plugin,
hermes-plivo-sms
License
MIT
1 maintainer
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