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docs/preset.md

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+# llama.cpp INI Presets
+
+## Introduction
+
+The INI preset feature, introduced in [PR#17859](https://github.com/ggml-org/llama.cpp/pull/17859), allows users to create reusable and shareable parameter configurations for llama.cpp.
+
+### Using Presets with the Server
+
+When running multiple models on the server (router mode), INI preset files can be used to configure model-specific parameters. Please refer to the [server documentation](../tools/server/README.md) for more details.
+
+### Using a Hugging Face Preset
+
+> [!IMPORTANT]
+>
+> Please only use presets that you can trust! Unknown presets may be unsafe
+
+You can push your preset to Hugging Face Hub and share with other users by:
+1. Creating an empty model repository on Hugging Face
+2. Creating a `preset.ini` file in the root directory of the repository
+
+Example of a `preset.ini`:
+
+```ini
+[*]
+ctx-size             = 0
+mmap                 = 1
+kv-unified           = 1
+parallel             = 4
+spec-default         = 1
+
+[Qwen3.5-4B]
+hf                   = unsloth/Qwen3.5-4B-GGUF:Q4_K_M
+ctx-size             = 262144
+batch-size           = 2048
+ubatch-size          = 2048
+top-p                = 1.0
+top-k                = 0
+min-p                = 0.01
+temp                 = 1.0
+
+[gpt-oss-120b-hf]
+hf                   = ggml-org/gpt-oss-120b-GGUF
+ctx-size             = 262144
+batch-size           = 2048
+ubatch-size          = 2048
+top-p                = 1.0
+top-k                = 0
+min-p                = 0.01
+temp                 = 1.0
+chat-template-kwargs = {"reasoning_effort": "high"}
+```
+
+The preset will be loaded similarly to the `--models-preset` option. Therefore, you can also override certain params via CLI arguments:
+
+```sh
+# Force temp = 0.1, overriding the preset value
+llama-cli -hf username/my-preset --temp 0.1
+```
+
+### Named presets
+
+If you want to define multiple preset configurations for one or more GGUF models, you can create a blank HF repo containing a single `preset.ini` file that references the actual model(s):
+
+```ini
+[*]
+mmap = 1
+
+[gpt-oss-20b-hf]
+hf          = ggml-org/gpt-oss-20b-GGUF
+batch-size  = 2048
+ubatch-size = 2048
+top-p       = 1.0
+top-k       = 0
+min-p       = 0.01
+temp        = 1.0
+chat-template-kwargs = {"reasoning_effort": "high"}
+
+[gpt-oss-120b-hf]
+hf          = ggml-org/gpt-oss-120b-GGUF
+batch-size  = 2048
+ubatch-size = 2048
+top-p       = 1.0
+top-k       = 0
+min-p       = 0.01
+temp        = 1.0
+chat-template-kwargs = {"reasoning_effort": "high"}
+```
+
+You can then use it via `llama-cli` or `llama-server`, example:
+
+```sh
+llama-server -hf user/repo:gpt-oss-120b-hf
+```
+
+Please make sure to provide the correct `hf-repo` for each child preset. Otherwise, you may get error: `The specified tag is not a valid quantization scheme.`