Callable-to-openai-function-calling-template

A Python utility that converts a user-defined Python function (using a specific docstring template and type annotations) into an OpenAI tool-calling compatible JSON schema/representation (function or tool format).

Evaluated Apr 04, 2026 (16d ago)

Repo ↗ DevTools function-calling openai tool-calling pydantic python

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

100

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

No network/API access described, but the tool-calling schema includes/describes function docstrings that may contain sensitive instructions/data. Also, the README warns about caution with arbitrary code in docstrings; while this library primarily parses docstrings/signatures, unsafe or overly permissive patterns in a broader workflow could still lead to security issues. No claims about dependency auditing, CVEs, or secret logging are provided in the supplied content.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

When you already have Python functions with consistent docstring formatting and want deterministic schema generation for OpenAI-style tool calling.

Avoid When

When your function docstrings do not match the expected template exactly, or you need robust handling of complex/heterogeneous Python type constructs beyond what the library supports.

Use Cases

• Generating OpenAI function/tool-calling schemas from Python functions for LLM agents
• Fine-tuning/inference workflows that require a consistent function-calling JSON template
• Reducing manual work translating function signatures + docstrings into OpenAI tool schemas

Not For

• Production-grade function execution/execution environments (it only generates schemas, not safe execution)
• Handling arbitrary docstrings/signatures that do not follow the expected template (the output may be incorrect)
• Services that require network-based authentication or rate-limited APIs

Interface

REST API

GraphQL

gRPC

MCP Server

SDK

Webhooks

Authentication

OAuth: No Scopes: No

No authentication is described; this is a local/offline schema-generation library.

Pricing

Free tier: No

Requires CC: No

No pricing information provided.

Agent Metadata

Pagination

none

Idempotent

True

Retry Guidance

Not documented

Known Gotchas

⚠ Docstring must match the expected template 'exactly' (including whitespace/empty lines) for correct parsing.
⚠ Behavior may differ based on get_tool_format vs direct function format expectations.
⚠ Library intentionally strips 'extra checks' compared to LangChain; malformed annotations/docstrings may yield incorrect schemas without clear remediation.

Alternatives

LangChain convert_to_openai_function / convert_to_openai_tool Manually constructing OpenAI tool schema JSON Other OpenAPI/function-schema generation utilities (if compatible with your docstring/signature conventions)

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Scores are editorial opinions as of 2026-04-04.