langchain4j-tool-function-calling-patterns SKILL.md skillA
langchain4j-tool-function-calling-patterns from giuseppe-trisciuoglio/developer-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add giuseppe-trisciuoglio/developer-kit/langchain4j-tool-function-calling-patterns@git:20260324.a02e282Pins git:20260324.a02e282 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- giuseppe-trisciuoglio/developer-kit
- Path
plugins/developer-kit-java/skills/langchain4j-tool-function-calling-patterns/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260324.a02e282, committed Mar 24, 2026
- First version recorded
- Feb 7, 2026
- Size
- 9,471 bytes
- Repository stars
- 367
- License
- MIT
Provides and generates LangChain4j tool and function calling patterns: annotates methods as tools with @Tool, configures tool executors, registers tools with AiServices, validates tool parameters, and handles tool execution errors. Use when building AI agents that call tools, define function specifications, manage tool responses, or integrate external APIs with LLM-driven applications.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# LangChain4j Tool & Function Calling Patterns Provides patterns for annotating methods as tools, configuring tool executors, registering tools with AI services, validating parameters, and handling tool execution errors in LangChain4j applications. ## Overview LangChain4j uses the `@Tool` annotation to expose Java methods as callable functions for AI agents. The `AiServices` builder registers tools with a chat model, enabling LLMs to perform actions beyond text generation: database queries, API calls, calculations, and business system integrations. Parameters use `@P` for descriptions that guide the LLM. ## When to Use - Building AI agents that call external tools (weather, stocks, database queries) - Defining function specifications for LLM tool use (`@Tool`, `@P` annotations) - Registering and managing tool sets with `AiServices.builder().tools()` - Handling tool execution errors, timeouts, and hallucinated tool names - Implementing context-aware tools that inject user state via `@ToolMemoryId` - Configuring dynamic tool providers for large or conditional tool sets ## Instructions ### 1. Annotate Methods with `@Tool` …
Read the whole file at its exact version.
How to install
mdr add giuseppe-trisciuoglio/developer-kit/langchain4j-tool-function-calling-patterns@sha256:6cd8ae4174737f3bThe line at the top of this page pins the label git:20260324.a02e282, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_imvl5n4oi5wvpppi)
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Versions
The registry has recorded 5 versions of this file, between Feb 7, 2026 and Mar 24, 2026, about one every 11 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260324.a02e282 latest | 2026-03-24 | a02e282 | 9,471 B | A | view · diff |
| git:20260323.935227a | 2026-03-23 | 935227a | 7,394 B | A | view · diff |
| git:20260223.c6d4db1 | 2026-02-23 | c6d4db1 | 16,385 B | A | view · diff |
| v1.1.0 | 2026-02-08 | 147afce | 16,552 B | A | view · diff |
| v1.1.0 | 2026-02-07 | 1a732c7 | 9,960 B | A | view |
Audit of the latest version
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- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9471 bytes)
- pass: No zero-width or bidi control characters
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Source
giuseppe-trisciuoglio/developer-kit · 367 stars · license MIT · pushed 2026-09-10 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_imvl5n4oi5wvpppi GET https://markdownregistry.com/api/v1/resolve?ref=giuseppe-trisciuoglio/developer-kit/langchain4j-tool-function-calling-patterns GET https://markdownregistry.com/api/v1/blob/6cd8ae4174737f3bcf351d0ba927a03fd5fc19a0d342935675b905587010f391
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