Azure Durable Functions website screenshot

Azure Durable Functions

Azure Durable Functions is a serverless extension for writing stateful workflows and orchestrations in code using Azure Functions. The extension exposes built-in HTTP APIs for managing orchestrations, durable entities, and task hubs.

Azure Durable Functions publishes 2 API contracts indexed on the APIs.io network: Entities API and Orchestrations API. Tagged areas include API Composition, Durable Execution, Serverless Orchestration, and Workflows.

The Azure Durable Functions catalog on APIs.io includes 1 Spectral governance ruleset.

Azure Durable Functions’ developer surface includes authentication, documentation, and 16 more developer resources.

36.2/100 thin ▬ flat Agent 22/100 agent aware self hosted · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
AccessFreemiumSelf serve⚡ Free to try
1 published contract 1 MCP Servers
API CompositionDurable ExecutionServerless OrchestrationWorkflows

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
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Agent readiness — checks not met, largest first (exact, from this profile):
  • Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
  • Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
  • Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
9 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/durable-functions/apis.yml: open an issue on github.com/api-evangelist/durable-functions to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

measured — observed by APIs.io (documented)
measured — observed by APIs.io (published)

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Azure Durable Functions Entities API

Durable entity management

Azure Durable Functions Orchestrations API

Orchestration instance management

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

MCP Server

MCP SERVER

Azure Durable Functions API pricing

Not yet checked against Azure Durable Functions's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

PlanPrice
Free freemium Free
Professional paid Free
Enterprise enterprise —

Plan details, limits and sources →

Rate limits

Compiled by API Evangelist, not yet checked against Azure Durable Functions's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Durable Functions Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

FinOps 1

Cost, billing, and metering signals for API financial operations.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Azure Durable Functions API Rules

52 rules · 50 errors 1 warnings 1 info

SPECTRAL

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Durable Functions Authentication

apiKey · 1 scheme

SECURITY

Durable Functions Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Durable Functions Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Durable Functions Agentic Access

14 operations · 10 acting · 1 human-in-the-loop

14 operations · 10 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

Build 2

SDKs, sample code, and the tooling you integrate with

Access & Security 4

Authentication, authorization, and security posture

Operate 3

Status, limits, changes, and where to get help

Commercial 3

Pricing, plans, and the legal terms of use

Company 1

The organization behind the API

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: durable-functions
name: Azure Durable Functions
description: Azure Durable Functions is a serverless extension for writing stateful workflows and orchestrations in code using
  Azure Functions. The extension exposes built-in HTTP APIs for managing orchestrations, durable entities, and task hubs.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: true
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/durable-functions.png
tags:
- API Composition
- Durable Execution
- Serverless Orchestration
- Workflows
tags_raw:
- API Composition
- Durable Execution
- Serverless Orchestration
- Workflow
url: https://raw.githubusercontent.com/api-evangelist/durable-functions/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: durable-functions:durable-functions-entities-api
  name: Azure Durable Functions Entities API
  description: Durable entity management
  humanURL: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-http-api
  baseURL: https://{appName}.azurewebsites.net
  tags:
  - Entities
  properties:
  - type: OpenAPI
    url: openapi/durable-functions-entities-api-openapi.yml
  - type: Documentation
    url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/
  - type: HTTP API Reference
    url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-http-api
  - type: GettingStarted
    url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-create-first-csharp
- aid: durable-functions:durable-functions-orchestrations-api
  name: Azure Durable Functions Orchestrations API
  description: Orchestration instance management
  humanURL: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-http-api
  baseURL: https://{appName}.azurewebsites.net
  tags:
  - Orchestration
  tags_raw:
  - Orchestrations
  properties:
  - type: OpenAPI
    url: openapi/durable-functions-orchestrations-api-openapi.yml
  - type: Documentation
    url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/
  - type: HTTP API Reference
    url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-http-api
  - type: GettingStarted
    url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-create-first-csharp
common:
- type: Plans
  url: plans/durable-functions-plans-pricing.yml
- type: RateLimits
  url: rate-limits/durable-functions-rate-limits.yml
- type: FinOps
  url: finops/durable-functions-finops.yml
- type: IssueTracker
  url: https://github.com/Azure/azure-functions-durable-extension/issues
- type: Releases
  url: https://github.com/Azure/azure-functions-durable-extension/releases
- type: SecurityPolicy
  url: https://github.com/Azure/azure-functions-durable-extension/blob/dev/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/Azure/.github/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/Azure/azure-functions-durable-extension/blob/dev/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/Azure/azure-functions-durable-extension/blob/dev/LICENSE
- type: AgenticAccess
  url: agentic-access/durable-functions-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/durable-functions-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/durable-functions-domain-security.yml
- type: Authentication
  url: authentication/durable-functions-authentication.yml
- type: Website
  url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-overview
- type: Documentation
  url: https://learn.microsoft.com/en-us/azure/azure-functions/durable/
- type: GitHubOrganization
  url: https://github.com/Azure
- type: Repository
  url: https://github.com/Azure/azure-functions-durable-extension
- name: MCP Server
  url: https://github.com/Azure/azure-functions-mcp-extension
  type: MCPServer
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Azure Durable Functions API — frequently asked questions

Does Azure Durable Functions have an API?

Yes. APIs.io lists 2 APIs from Azure Durable Functions, including Azure Durable Functions Entities API and Azure Durable Functions Orchestrations API.

Is there an OpenAPI specification for the Azure Durable Functions API?

Yes. APIs.io indexes 2 OpenAPI specifications for Azure Durable Functions, each linked for download from this page.

How do I authenticate with the Azure Durable Functions API?

Azure Durable Functions uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Durable Functions Authentication.

How much does the Azure Durable Functions API cost?

APIs.io lists 3 pricing plans for Azure Durable Functions, with each plan's price, limits and inclusions under Pricing on this page.

Does Azure Durable Functions have an MCP server?

Yes. APIs.io lists 1 MCP server for Azure Durable Functions.

Is the Azure Durable Functions API ready for AI agents?

Azure Durable Functions has a Kin Score of 36.2 out of 100 (thin) and an Agent Readiness score of 21.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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