> For the complete documentation index, see [llms.txt](https://docs.sedona.fun/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sedona.fun/core-client.md).

# Core client reference

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`createClient(provider, options)` returns one non-generic client. Sessions open lazily on the first operation and are single-flight. Call `close()` when the client is no longer needed.

## Resources

| Resource       | Purpose                                                |
| -------------- | ------------------------------------------------------ |
| `connection`   | provider readiness and limitations                     |
| `capabilities` | separate provider evidence from adapter implementation |
| `lines`        | list and inspect sending lines                         |
| `addresses`    | advisory iMessage reachability                         |
| `chats`        | create, list, and inspect conversations                |
| `messages`     | send, list, edit, and unsend                           |
| `reactions`    | add and remove reactions                               |
| `typing`       | send typing state                                      |
| `receipts`     | mark a specific inbound message read                   |
| `contactCards` | share a contact card                                   |
| `events`       | list or stream provider events                         |
| `webhooks`     | verify, parse, and administer subscriptions            |
| `raw`          | authenticated provider escape hatch                    |
| `extensions`   | descriptor-declared provider-specific operations       |

The core client also defines generic resources for groups, attachments, backgrounds, locations, and polls. Their presence on the client does not mean a provider implements them. Query `client.capabilities` or handle `capability_unavailable`.

## Client options

| Option            | Meaning                                               |
| ----------------- | ----------------------------------------------------- |
| `transportPolicy` | default send policy; use `require_imessage` for Fleet |
| `timeoutMs`       | default HTTP transport budget                         |
| `readRetry`       | bounded retry policy for declared transient reads     |
| `telemetry`       | local operation event hook                            |

Per-call options include `signal` and `timeoutMs`. Send options additionally include line selection, idempotency, effects, replies, transport policy, and provider options.

Read [Fleet provider reference](/core-client/fleet-provider.md) for the implemented subset.


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