Update tests and implementation to use the new ordered map-based
ToolCallFunctionArguments type which replaces the previous map[string]any.
- Add mapToArgs helper to convert map[string]any to ToolCallFunctionArguments
- Add testArgs and testProps helpers in tests
- Use cmpopts.IgnoreUnexported for cmp.Diff comparisons
Use *string instead of string for Text and Thinking fields in ContentBlock
so that omitempty works correctly:
- nil pointer: field omitted from JSON (for blocks that don't use it)
- ptr(""): field present as "" (for SDK streaming accumulation)
- ptr("content"): field present with content
This keeps the JSON output clean (text blocks don't have thinking field,
thinking blocks don't have text field) while still satisfying SDK
requirements for field presence during streaming.
Fix edge case where messages containing only a thinking block (no text,
images, or tool calls) would be dropped. Add thinking != "" to the
condition that creates messages from content blocks.
Remove omitempty from Text and Thinking fields in ContentBlock struct.
The Anthropic SDK requires these fields to be present (even if empty)
in content_block_start events to properly accumulate streaming deltas.
- Add proper error handling for JSON marshal in StreamConverter to
prevent corrupted streams when tool arguments cannot be serialized
- Add tests for unmarshalable arguments and mixed validity scenarios
- Fix documentation typo and update recommended models to qwen3-coder
Add middleware to support the Anthropic Messages API format at /v1/messages.
This enables tools like Claude Code to work with Ollama models through the
Anthropic API interface.
Features:
- Request/response transformation between Anthropic and internal formats
- Streaming support with SSE events (message_start, content_block_delta, etc.)
- Tool calling support (tool_use and tool_result content blocks)
- Thinking/extended thinking block support
- Image content block support (base64)
- System prompt handling
- Multi-turn conversation support
- Proper stop_reason mapping (end_turn, max_tokens, tool_use)
- Error responses in Anthropic format
New files:
- anthropic/anthropic.go: Types and transformation functions
- middleware/anthropic.go: Request/response middleware
ParthSareen