Add Cohere docs (#108)

* Create cohere.md

* Update mkdocs.yml

* Update docs/user-guide/concepts/model-providers/cohere.md

Co-authored-by: Nick Clegg <nac542@gmail.com>

* Update cohere.md

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Co-authored-by: Nick Clegg <nac542@gmail.com>

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Co-authored-by: Nick Clegg <nac542@gmail.com>

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* Update docs/user-guide/concepts/model-providers/cohere.md

---------

Co-authored-by: Nick Clegg <nac542@gmail.com>

Author: billytrend-cohere

docs/user-guide/concepts/model-providers/cohere.md

@@ -0,0 +1,77 @@
+# Cohere
+
+[Cohere](https://cohere.com) provides cutting-edge language models. These are accessible accessible through OpenAI's SDK via the Compatibility API. This allows easy and portable integration with the Strands Agents SDK using the familiar OpenAI interface.
+
+## Installation
+
+The Strands Agents SDK provides access to Cohere models through the OpenAI compatiblity layer, configured as an optional dependency. To install, run:
+
+```bash
+pip install 'strands-agents[openai]'
+```
+
+## Usage
+
+After installing the `openai` package, you can import and initialize the Strands Agents' OpenAI-compatible provider for Cohere models as follows:
+
+```python
+from strands import Agent
+from strands.models.openai import OpenAIModel
+from strands_tools import calculator
+
+model = OpenAIModel(
+    client_args={
+        "api_key": "<COHERE_API_KEY>",
+        "base_url": "https://api.cohere.ai/compatibility/v1",  # Cohere compatibility endpoint
+    },
+    model_id="command-a-03-2025",  # or see https://docs.cohere.com/docs/models
+    params={
+        "stream_options": None
+    }
+)
+
+agent = Agent(model=model, tools=[calculator])
+agent("What is 2+2?")
+```
+
+## Configuration
+
+### Client Configuration
+
+The `client_args` configure the underlying OpenAI-compatible client. When using Cohere, you must set:
+
+* `api_key`: Your Cohere API key. Get one from the [Cohere Dashboard](https://dashboard.cohere.com).
+* `base_url`:
+    * `https://api.cohere.ai/compatibility/v1`
+
+Refer to [OpenAI Python SDK GitHub](https://github.com/openai/openai-python) for full client options.
+
+### Model Configuration
+
+The `model_config` specifies which Cohere model to use and any additional parameters.
+
+| Parameter  | Description               | Example                                    | Options                                                            |
+| ---------- | ------------------------- | ------------------------------------------ | ------------------------------------------------------------------ |
+| `model_id` | Model name                | `command-r-plus`                           | See [Cohere docs](https://docs.cohere.com/docs/models)             |
+| `params`   | Model-specific parameters | `{"max_tokens": 1000, "temperature": 0.7}` | [API reference](https://docs.cohere.com/docs/compatibility-api) |
+
+## Troubleshooting
+
+### `ModuleNotFoundError: No module named 'openai'`
+
+You must install the `openai` dependency to use this provider:
+
+```bash
+pip install 'strands-agents[openai]'
+```
+
+### Unexpected model behavior?
+
+Ensure you're using a model ID compatible with Cohere’s Compatibility API (e.g., `command-r-plus`, `command-a-03-2025`, `embed-v4.0`), and your `base_url` is set to `https://api.cohere.ai/compatibility/v1`.
+
+## References
+
+* [Cohere Docs: Using the OpenAI SDK](https://docs.cohere.com/docs/compatibility-api)
+* [Cohere API Reference](https://docs.cohere.com/reference)
+* [OpenAI Python SDK](https://github.com/openai/openai-python)
+* [Strands Agents API](../../../api-reference/models.md)

mkdocs.yml

@@ -89,6 +89,7 @@ nav:
         - MistralAI: user-guide/concepts/model-providers/mistral.md
         - Ollama: user-guide/concepts/model-providers/ollama.md
         - OpenAI: user-guide/concepts/model-providers/openai.md
+        - Cohere: user-guide/concepts/model-providers/cohere.md
         - Custom Providers: user-guide/concepts/model-providers/custom_model_provider.md
       - Streaming:
         - Async Iterators: user-guide/concepts/streaming/async-iterators.md