Azure Cosmos DB SDK for Rust

azure-cosmos-rust

Client library for Azure Cosmos DB NoSQL API — globally distributed, multi-model database.

MudassarAbrar/SAGE__GEMINI_LIVE_AGENT_HACKATHON·0installs3stars

SKILL.md

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Azure Cosmos DB SDK for Rust

Client library for Azure Cosmos DB NoSQL API — globally distributed, multi-model database.

Installation

cargo add azure_data_cosmos azure_identity

Environment Variables

COSMOS_ENDPOINT=https://<account>.documents.azure.com:443/
COSMOS_DATABASE=mydb
COSMOS_CONTAINER=mycontainer

Authentication

use azure_identity::DeveloperToolsCredential;
use azure_data_cosmos::CosmosClient;

let credential = DeveloperToolsCredential::new(None)?;
let client = CosmosClient::new(
    "https://<account>.documents.azure.com:443/",
    credential.clone(),
    None,
)?;

Client Hierarchy

Client	Purpose	Get From
`CosmosClient`	Account-level operations	Direct instantiation
`DatabaseClient`	Database operations	`client.database_client()`
`ContainerClient`	Container/item operations	`database.container_client()`

Core Workflow

Get Database and Container Clients

let database = client.database_client("myDatabase");
let container = database.container_client("myContainer");

Create Item

use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize)]
struct Item {
    pub id: String,
    pub partition_key: String,
    pub value: String,
}

let item = Item {
    id: "1".into(),
    partition_key: "partition1".into(),
    value: "hello".into(),
};

container.create_item("partition1", item, None).await?;

Read Item

let response = container.read_item("partition1", "1", None).await?;
let item: Item = response.into_model()?;

Replace Item

let mut item: Item = container.read_item("partition1", "1", None).await?.into_model()?;
item.value = "updated".into();

container.replace_item("partition1", "1", item, None).await?;

Patch Item

use azure_data_cosmos::models::PatchDocument;

let patch = PatchDocument::default()
    .with_add("/newField", "newValue")?
    .with_remove("/oldField")?;

container.patch_item("partition1", "1", patch, None).await?;

Delete Item

container.delete_item("partition1", "1", None).await?;

Key Auth (Optional)

Enable key-based authentication with feature flag:

cargo add azure_data_cosmos --features key_auth

Best Practices

Always specify partition key — required for point reads and writes
Use into_model()? — to deserialize responses into your types
Derive Serialize and Deserialize — for all document types
Use Entra ID auth — prefer DeveloperToolsCredential over key auth
Reuse client instances — clients are thread-safe and reusable

Reference Links

Resource	Link
API Reference	https://docs.rs/azure_data_cosmos
Source Code	https://github.com/Azure/azure-sdk-for-rust/tree/main/sdk/cosmos/azure_data_cosmos
crates.io	https://crates.io/crates/azure_data_cosmos

When to Use

This skill is applicable to execute the workflow or actions described in the overview.

Install skill

Copy and run in your terminal

npx -y skills add https://github.com/MudassarAbrar/SAGE__GEMINI_LIVE_AGENT_HACKATHON --skill azure-cosmos-rust

View on GitHub

skills/azure-cosmos-rust/SKILL.md

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