Get Started with Microsoft Agent Framework Declarative
Please install this package via pip:
pip install agent-framework-declarative
Release stage
This package ships at two different stability levels:
- Declarative workflows (
WorkflowFactory, executors, handlers, and the_workflowssurface) are stable. - Declarative agents (
AgentFactoryand the YAML agent loading/parsing path:DeclarativeLoaderError,ProviderLookupError,ProviderTypeMapping) are experimental and may change or be removed in future versions without notice. Using any of these symbols emits anExperimentalWarningon first use.
Declarative features
The declarative packages provides support for building agents based on a declarative yaml specification.
HTTP request client ownership and cookies
Breaking change: The HTTP client created by DefaultHttpRequestHandler no longer
persists response cookies. The handler still creates its client lazily, reuses it across
requests and workflows, and closes it on aclose() or async context-manager exit.
Timeout and redirect defaults are unchanged.
Applications requiring cookies for authentication, session continuity, or load-balancer
affinity must supply an httpx.AsyncClient through client= or client_provider=.
Supplied and provider-returned clients retain their configuration and cookie behavior
and must be closed by the caller. Scope cookie-bearing clients to one authenticated
principal; sharing a handler across workflows does not partition a client's cookies.
A provider returning None falls back to client=, if supplied, then to the internally
owned client with the default cookie policy.
Explicit Cookie request headers remain supported. Response Set-Cookie headers
remain available in HttpRequestResult.headers; disabling persistence does not redact
the response.
MCP handler session lifetime
DefaultMCPToolHandler() reuses MCP sessions through a bounded LRU cache.
When configured with client_provider, it instead invokes the provider and
creates a fresh MCP tool/session for every invocation, including tools/list.
Sessions are never reused in this mode, even if the provider returns None
or the same httpx.AsyncClient instance.
Each invocation closes its tool/session on success, failure, or cancellation.
Internally created fallback HTTP clients are also closed; caller-supplied HTTP
clients remain caller-owned and are never closed by the handler. Calling
aclose() rejects new invocations and waits for active provider-backed
invocations to finish cleaning up. Calling it from an active invocation's
context (including provider callbacks, inherited child tasks, and cleanup)
raises RuntimeError before changing handler state, rather than waiting on
itself. Close the handler outside that context or after the invocation completes.
This intentionally incurs connection and initialization overhead and does not
retain server session state between provider-backed invocations. Applications
that require shared session ownership must implement an explicitly scoped
custom MCPToolHandler; there is no provider-backed session-cache opt-in.
6 maintainers
Metadata
6 maintainers
Release files for agent-framework-declarative 1.2.1
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Source distribution (sdist)
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| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| agent_framework_declarative-1.2.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 220.3 kB
Release files / agent_framework_declarative-1.2.1.tar.gz
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