utcp 0.2.1

LLM tool calling for Dart and Flutter: a UTCP client that calls tools over HTTP, SSE and OpenAPI directly, with no wrapper server.

0.2.1

• Docs: package cross-links, badges and platform notes.
• Example: example/claude_tool_use.dart gives UTCP tools to an LLM through the Claude Messages API tool-use loop.

0.2.0

• Breaking: UtcpClient.create takes protocols as a list; each protocol declares its callTemplateTypes.
• Breaking: tool arguments are Map<String, Object?> and Tool.inputs/outputs are typed JsonSchemas.
• Breaking: HttpCallTemplate.httpMethod is an HttpMethod enum; Auth.register and CallTemplate.register moved to Auth.registry and CallTemplate.registry.
• Added UtcpClient.fromJson for the configuration format shared with the other UTCP SDKs.
• HttpTransport and buildToolRequest are public for transports built on HTTP.
• http manuals may be OpenAPI 2.0 or 3.x documents, converted to tools; OpenApiConverter converts documents loaded elsewhere.
• Added the text transport for UTCP manuals and OpenAPI documents supplied inline.
• Added substituteArgumentPlaceholders and utcpDiscoveryMessage for transports that send UTCP_ARG_<name>_UTCP_ARG templates.
• Redirects to another origin drop every credential-like header, static template headers included, and a request body is never resent to another origin.
• The remote-loopback rule covers every transport through CallTemplate.endpoints.
• YAML alias expansion is bounded (decodeYaml), so a small hostile document cannot exhaust memory or CPU; aliases and collections used as mapping keys are rejected. Nesting too deep to parse fails with a FormatException instead of a stack overflow.
• OpenAPI-generated tools send the manual's static headers only to the spec's own origin, and a spec reached through a cross-origin redirect gets neither those headers nor auth_tools (a warning is logged).
• Fixed concurrent registrations of the same manual name both succeeding.
• Fixed loopback detection of decimal IPv4 addresses on the web.
• Added the sse transport: event-type filtering, Last-Event-ID reconnects, and streaming as events arrive.
• Added the streamable_http transport for NDJSON, JSON and chunked binary responses.
• Added filter_dict and limit_strings result post-processors, configured with post_processing.
• A timed-out or cancelled HTTP request now releases its connection.
• A remotely discovered manual may not point sse or streamable_http tools at loopback either.
• Requires http 1.6.0 or later.

0.1.0

• Initial release: UTCP manual, tool, call-template, and auth models.
• UtcpClient with manual registration, tool calls, streaming calls, and tag/description search.
• Namespaced ${VAR} substitution from config, variable loaders, and the environment.
• HTTP transport with API key, Basic, OAuth2 client-credentials, and user OAuth2 auth.
• HTTPS-only remote requests, redirect re-validation, and auth stripping on cross-origin redirects.