skills.rest
ZipperCode
ZipperCodeCOMMUNITY
Explore all skills by this author →
GitHub

claude-code-api-tools

Implement Anthropic tool_use and tool_result compatibility for Claude Code gateway servers.

4|1|Updated Apr 29, 2026
Search Tags:#claude code#anthropic#api gateway#function calling#tool_use#sse streaming#protocol compatibility
One-click install
npx skills add https://github.com/ZipperCode/lingma2api --skill claude-code-api-tools-zippercode
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: claude-code-api-tools
Source: https://github.com/ZipperCode/lingma2api/tree/main/.claude/skills/claude-code-api-tools
Command: npx skills add https://github.com/ZipperCode/lingma2api --skill claude-code-api-tools-zippercode

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve? Building an OpenAI-compatible or Anthropic-compatible gateway that works with Claude Code requires correctly handling tool schemas, streaming tool_use blocks, and tool_result messages; this Skill provides the exact wire-format rules so the gateway interoperates with Claude Code without protocol errors. ## Core Features & Use Cases - Tool Schema Handling: Parse incoming tools arrays and tool_choice from /v1/messages, preserving tool names (including MCP-style mcp__server__tool names) and tolerating extension fields like strict, defer_loading, and cache_control. - Streaming tool_use Emission: Emit Anthropic SSE events (content_block_start, input_json_delta, content_block_stop) with valid JSON fragments and stop_reason: tool_use, plus non-streaming equivalents. - tool_result Round-Trip: Accept tool_result content blocks in follow-up user messages and forward them to the upstream model, matching tool_use_id values. - Use Case: When a Claude Code client sends a Bash tool definition to your gateway, convert it for the upstream model, stream back a well-formed tool_use block, and correctly route the client's tool_result on the next turn. ## Quick Start Ask the AI to implement tool-call compatibility in the gateway's /v1/messages handler following this Skill's protocol rules.

Frequently Asked Questions about claude-code-api-tools

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I stream Anthropic tool_use blocks from a gateway?▼

Emit content_block_start with type tool_use, then send the input as input_json_delta events containing partial_json string fragments, followed by content_block_stop and a message_delta with stop_reason tool_use. The concatenated partial_json must form a valid JSON object.

How to handle tool_result messages in a Claude Code gateway?▼

Claude Code sends tool_result blocks in the next user message with a tool_use_id matching the earlier tool_use id. The gateway forwards these results to the upstream model as the tool execution output and should accept content as either a string or content block array.

Does the gateway need to execute tools for Claude Code?▼

No, the gateway never executes tools. Claude Code runs tools locally on the client side; the gateway only lets the model request tool calls via tool_use blocks and reads the tool_result in the following turn.

Can I convert OpenAI function calls to Anthropic tool_use format?▼

Yes, when the upstream model returns an OpenAI-style function call, the gateway converts it into an Anthropic tool_use block with matching name and input. If the arguments are not valid JSON, return a 502 or synthesized text error instead of malformed input_json_delta.

What are MCP tool names like mcp__server__tool in requests?▼

MCP tool names follow the format mcp__<server_name>__<tool_name>, with hyphens in server names typically converted to underscores. The gateway treats them as ordinary tool names without connecting to any MCP server or splitting the name.

Should defer_loading tools be handled differently by the gateway?▼

A minimal gateway can ignore defer_loading and pass the tool to the upstream model as a normal tool. The field indicates the full schema may be loaded later via a ToolSearch workflow, but it must not cause an error.

Related Skills

Explore More Software Engineering Skills→
axell2017axell2017

AegisGate Agent Skill

Deploy AegisGate with Docker, configure token routing, and generate client baseUrl formats.

Community
Advanced
danielshmayaidanielshmayai

performance

Apply streaming, parallel processing, and caching to reduce latency in Claude-powered applications.

Community
Advanced
grandameniumgrandamenium
88

tool-use-patterns

Coordinate Claude tool calls across sequential, parallel workflows with robust error handling.

Community
Advanced
decninerdecniner

claude-proxy-backends

Route Claude Code CLI through local proxies to alternative LLM providers.

Community
Intermediate