Caspian SDK Release on GitHub
TryCaspian released
Channel Adapters and Handler Design
Caspian abstracts platform differences behind a CommClient class. After initialization the client loads credentials from environment variables and exposes one decorator for message handling. Threading, webhook signature checks, and rate-limit responses are handled inside the adapter layer rather than in user code.
The Python path uses a decorator that receives a Message object containing sender address, text, and channel metadata. The TypeScript SDK follows the same pattern with typed interfaces for the same fields. Both implementations expose connect methods for each supported channel, returning the agent’s address or handle on that platform.
This design keeps the agent’s reasoning loop focused on text generation instead of protocol quirks. Developers who previously maintained 25 separate adapters inside larger frameworks can now replace that surface with a single dependency and one handler function.
Installation and Runtime Commands
The project ships two packages. The runtime library installs with pip or npm. The CLI installs via pipx or uvx and provides the caspian command.
pip install caspian-sdk
pipx install caspian-cli
caspian init
caspian connect email
The init step writes CASPIAN_API_KEY and CASPIAN_BASE_URL to a .env file. The connect command provisions an address on the chosen channel without manual webhook registration. After setup the agent code imports CommClient, instantiates it, registers the handler, and calls listen or equivalent. The same pattern works for every listed channel once the CLI has run.
The repository also includes an llms.txt file and a SKILL.md endpoint intended for coding agents. An external agent can read the current integration guide and generate the full handler without manual lookup.
Trade-offs in the Current Implementation
The single-handler model reduces boilerplate but introduces a dependency on Caspian’s hosted relay for message delivery. Local testing requires either the hosted service or a mock adapter that the project does not yet supply. Error handling for transient platform failures remains inside the library; the handler only sees a cleaned Message object or an exception.
Python and TypeScript coverage is complete for the listed channels, yet the adapters themselves are closed for modification. Custom platforms require waiting for upstream support rather than writing a local adapter. The CLI generates keys tied to the Caspian account, so key rotation and multi-environment secrets follow the service’s account model rather than local secret stores.
These constraints are typical for early unified messaging layers. Teams that need full control over every transport will continue to implement direct webhooks, while teams that accept the relay gain faster multi-channel reach.
How the SDK Fits Existing Agent Loops
Most agent frameworks already separate reasoning from I/O. Caspian slots into that separation by replacing the I/O portion. The handler receives raw text and returns text or structured replies; the framework decides when to call the model. This keeps existing orchestration code unchanged while expanding the set of reachable users.
FAQ
Does Caspian require an always-on server? The client opens a persistent connection or registers webhooks through the service, so the process must stay reachable for inbound messages.
Can the same handler run on multiple channels at once? Yes. One CommClient instance registers handlers that fire for any connected channel; the message object identifies the source.
Is the relay open source? Only the client libraries and CLI are public. The message routing layer remains a hosted component.
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