Implementation:Ggml org Llama cpp Jinja Caps Header

Knowledge Sources	Ggml_org_Llama_cpp
Domains	Template_Engine, Chat
Last Updated	2026-02-15 00:00 GMT

Overview

Declares the `caps` struct representing detected capabilities of a Jinja chat template.

Description

This header defines the `caps` struct with boolean flags for template capabilities: `supports_tools`, `supports_tool_calls`, `supports_system_role`, `supports_parallel_tool_calls`, `supports_preserve_reasoning`, `supports_string_content`, and `supports_typed_content`. It provides `to_map()` for serialization and `to_string()` for debug output. The `caps_get()` function declaration takes a compiled Jinja program and returns the detected capabilities.

Usage

Include this header when you need to query or represent the capabilities of a chat template. Use it in server code to adapt API behavior based on what the loaded model's template actually supports.

Code Reference

Source Location

• Repository: Ggml_org_Llama_cpp
• File: common/jinja/caps.h
• Lines: 1-30

Signature

namespace jinja {

struct caps {
    bool supports_tools = true;
    bool supports_tool_calls = true;
    bool supports_system_role = true;
    bool supports_parallel_tool_calls = true;
    bool supports_preserve_reasoning = false;
    bool supports_string_content = true;
    bool supports_typed_content = false;

    std::map<std::string, bool> to_map() const;
    std::string to_string() const;
};

caps caps_get(jinja::program & prog);

} // namespace jinja

Import

#include "jinja/caps.h"

I/O Contract

Inputs

Name	Type	Required	Description
prog	jinja::program &	Yes	Compiled Jinja program to analyze for capabilities

Outputs

Name	Type	Description
caps_get return	caps	Struct containing boolean flags for each detected template capability
to_map return	std::map<std::string, bool>	Serializable map of capability name to boolean value
to_string return	std::string	Debug-friendly string representation of all capabilities

Usage Examples

#include "jinja/caps.h"

// After compiling a Jinja template
jinja::caps caps = jinja::caps_get(compiled_program);

// Query individual capabilities
if (caps.supports_tools && caps.supports_tool_calls) {
    // Template supports function calling
}

// Get a map for JSON serialization
auto cap_map = caps.to_map();
// {"supports_tools": true, "supports_tool_calls": true, ...}

Related Pages

• Principle:Ggml_org_Llama_cpp_Template_Capability_Detection