[agentserver-core] Add FoundryStateStore durable KV storage layer

[shanmukha1200]

Add azure.ai.agentserver.core.storage: protocol-neutral FoundryStorageClient (transport, endpoint, pipeline policies, error hierarchy) plus FoundryStateStore, a generic durable key-value store over /storage/state:read|:write|:listKeys with namespace/key/value/tags, optional if_match optimistic concurrency, and ordered paged list_keys. Adds azure-core dependency and tests.

Responses has its own storage providers idea is to make responses re-use this storage clients in a follow-up PR

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Thank you for your contribution @shanmukha1200! We will review the pull request and get back to you soon.

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Pull request overview

This PR adds a new protocol-neutral storage layer (azure.ai.agentserver.core.storage) to azure-ai-agentserver-core. It introduces FoundryStorageClient (a base owning the AsyncPipelineClient, policy chain, and error handling) and FoundryStateStore, a generic durable key-value store over POST /storage/state:read|:write|:listKeys with namespace/key/value/tags, optional if_match optimistic concurrency, and ordered, paged list_keys. This generalizes the existing responses-package FoundryStorageProvider into the shared core so protocol packages can build resource-specific clients on top.

Changes:

• New storage subpackage: client/transport, endpoint resolution, error hierarchy, pipeline policies, JSON helpers, and the FoundryStateStore KV store with its serializer.
• Added azure-core>=1.30.0 dependency and a CHANGELOG 2.0.0b6 (Unreleased) entry.
• Added unit tests for request construction and response handling.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
storage/__init__.py	Public exports for the new storage package.
storage/_client.py	FoundryStorageClient base: pipeline, policies, _send_storage_request.
storage/_endpoint.py	FoundryStorageEndpoint resolution and versioned URL building.
storage/_errors.py	Storage exception hierarchy incl. new FoundryStoragePreconditionError (412).
storage/_policies.py	UA + per-retry logging policies with URL masking.
storage/_state.py	FoundryStateStore read/write/list_keys/get/set/delete.
storage/_state_serializer.py	Wire (de)serialization + StateItem/StateKey/KeyPage types.
storage/_json.py	Small JSON parsing helper.
tests/test_foundry_state_store.py	Unit tests for request/response behavior.
pyproject.toml	Adds azure-core>=1.30.0 dependency.
CHANGELOG.md	Adds 2.0.0b6 (Unreleased) feature entry (version not synced — see comment).

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[RaviPidaparthi]

Can you simplify?

store = FoundryStateStore.get_or_create(...)
await store.set(...)

[RaviPidaparthi]

This whole surface needs some polish

store = await FoundryStateStore.create(...);
store = await FoundryStateStore.get(name);
store = await FoundryStateStore.get_or_create(...);
store = await store.update(...);
store = await store.delete(...);

[RaviPidaparthi]

Follow the same naming convention for all item operations <create/set/deleteget>_item()

[shanmukha1200]

ack..updated

[RaviPidaparthi]

Why StateStoreItemMetadata and not StateStoreItem?

[shanmukha1200]

StateStoreItem has a value by definition maybe metadata sounds vague but we would need another typed response object

[shanmukha1200]

maybe

stateStoreItem
           ----> StateStoreItemKey
                    --->Name
                    ---->etag
                    -----> createdAt
                    ----> updatedAt
           -----> Value

follow this heirarchy and return StateStoreItemKey for create and StateStoreItem for get

[RaviPidaparthi]

StateStoreItemKeysPage

[shanmukha1200]

this needs typespec change will take it up once all other comments are resolved

[RaviPidaparthi]

This kind of overload is bad. Lets avoid this and make item methods separate and explicit *_item methods.

[shanmukha1200]

ack..updated