feat(client): add demo mode via AXONFLOW_DEMO env var

CHANGELOG.md

@@ -5,19 +5,12 @@ All notable changes to the AxonFlow Python SDK will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [6.3.0] - Release Pending (2026-04-09)
+## [6.3.0] - 2026-04-09
 
 ### Added
-
-- **Explicit IPv6 + RFC1918 boundary test coverage.** The v6.2.0 test suite relied on Python stdlib `ipaddress.is_private` for correctness and didn't assert the behavior explicitly. New cases cover:
-  - `172.15.0.1` and `172.32.0.1` must be `remote` (RFC1918 boundary)
-  - `172.16.0.0` and `172.31.255.255` must be `private_network`
-  - IPv6 ULA (`fd00::1`, `fd12:3456:789a::1`, `fc00::1`) → `private_network`
-  - IPv6 link-local (`fe80::1`) → `private_network`
-  - Public IPv6 (`2001:4860:4860::8888`, `2606:4700:4700::1111`) → `remote`
-  - IPv6 loopback `::1` → `localhost`
-
-No runtime behavior change — Python's stdlib classifier was already correct for all these cases. The added tests are cross-SDK parity with TS/Java/Go.
+- `AXONFLOW_TRY=1` environment variable to connect to `try.getaxonflow.com` shared evaluation server
+- `register_try()` helper in `axonflow.community` for self-registering a tenant
+- Checkpoint telemetry reports `endpoint_type: "community-saas"` when try mode is active
 
 ---
 

axonflow/client.py

@@ -358,11 +358,18 @@ def __init__(
 
             As of v1.0.0, all routes go through a single endpoint (Single Entry Point Architecture).
         """
-        # Support AXONFLOW_AGENT_URL env var for backwards compatibility
-        resolved_endpoint = endpoint or os.environ.get("AXONFLOW_AGENT_URL")
-        if not resolved_endpoint:
-            msg = "endpoint is required (or set AXONFLOW_AGENT_URL environment variable)"
-            raise TypeError(msg)
+        # Try mode: auto-connect to try.getaxonflow.com (must be checked before endpoint validation)
+        if os.environ.get("AXONFLOW_TRY") == "1":
+            resolved_endpoint = "https://try.getaxonflow.com"
+            if not client_id:
+                msg = "client_id is required in try mode (AXONFLOW_TRY=1)"
+                raise TypeError(msg)
+        else:
+            # Support AXONFLOW_AGENT_URL env var for backwards compatibility
+            resolved_endpoint = endpoint or os.environ.get("AXONFLOW_AGENT_URL") or ""
+            if not resolved_endpoint:
+                msg = "endpoint is required (or set AXONFLOW_AGENT_URL environment variable)"
+                raise TypeError(msg)
 
         if isinstance(mode, str):
             mode = Mode(mode)

axonflow/community.py

@@ -0,0 +1,29 @@
+"""Community SaaS registration helper for try.getaxonflow.com."""
+
+from __future__ import annotations
+
+from typing import Any
+
+import httpx
+
+TRY_ENDPOINT = "https://try.getaxonflow.com"
+
+
+def register_try(label: str = "", endpoint: str = TRY_ENDPOINT) -> dict[str, Any]:
+    """Register for a free evaluation tenant on try.getaxonflow.com.
+
+    Returns dict with keys: tenant_id, secret, secret_prefix, expires_at, endpoint, note.
+    Store the secret securely — it is shown only once.
+
+    Args:
+        label: Optional human-readable name for the registration.
+        endpoint: Override the default endpoint (for local testing).
+    """
+    response = httpx.post(
+        f"{endpoint}/api/v1/register",
+        json={"label": label} if label else {},
+        timeout=10.0,
+    )
+    response.raise_for_status()
+    data: dict[str, Any] = response.json()
+    return data

axonflow/telemetry.py

@@ -87,6 +87,7 @@ def _classify_endpoint(url: str | None) -> str:  # noqa: PLR0911
     """Classify the configured AxonFlow endpoint for analytics (#1525).
 
     Returns one of:
+        ``"community-saas"``    — try.getaxonflow.com shared evaluation server
         ``"localhost"``         — localhost, 127.0.0.1, ::1, 0.0.0.0, ``*.localhost``
         ``"private_network"``   — RFC1918 ranges, link-local, ``*.local``,
                                   ``*.internal``, ``*.lan``, ``*.intranet``
@@ -95,6 +96,8 @@ def _classify_endpoint(url: str | None) -> str:  # noqa: PLR0911
 
     The raw URL is never sent — only the classification. See issue #1525.
     """
+    if os.environ.get("AXONFLOW_TRY") == "1":
+        return "community-saas"
     if not url:
         return "unknown"
     try: