openfeature-flagd-api
OpenFeature flagd evaluator API definition
Decision gist · record as of 2026-08-14
Yes, if you are building a custom flagd evaluator for OpenFeature. This is a pure contract package with no vulnerabilities, permissive licensing, and active maintenance. Install only if you need to implement the Evaluator protocol; it is not a standalone tool but a dependency for evaluator development.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction with a single runtime dependency on openfeature-sdk.
- Actively maintained as of 2026-08-12 with recent activity.
License · maintenance · safety
permissive license (permissive) — Apache 2.0 permissive license allows commercial and private use, modification, and distribution with minimal restrictions—only requiring license and copyright notice preservation.
last release 2026-04-30 (106 days) · last repo commit 2026-08-12 · 25 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 208,621 downloads/mo, #9,529 on PyPI
Alternatives
Verify before relying
pip install openfeature-flagd-api
from openfeature.contrib.tools.flagd.api import Evaluator, FlagStoreException
# Implement the Evaluator protocol for custom evaluator- Whether the package includes concrete example implementations or reference evaluators beyond the protocol definition.
- API stability guarantees or semantic versioning policy for the protocol contract.
- Integration testing guidance or compatibility matrix with specific flagd versions.
What it is and what it does
This package provides the pure API contract—a Python Protocol—that defines what a flagd evaluator must implement to work with the OpenFeature SDK. It is a lightweight interface definition rather than a working implementation, intended for developers who want to create custom evaluators for the flagd provider. The package depends only on openfeature-sdk and is part of the OpenFeature Python SDK contrib project, mirroring the Java flagd-api module.
You install it when you need to build your own evaluator implementation that conforms to the flagd contract. It establishes the protocol boundary between the OpenFeature framework and custom evaluation logic, allowing third-party code to plug in without modifying the core SDK.
Use it for
- Building a custom flagd evaluator implementation that integrates with the OpenFeature SDK.
- Defining type-safe contracts for feature flag evaluation in a larger OpenFeature architecture.
- Creating a domain-specific evaluator that implements the Evaluator protocol for specialized flag resolution logic.
- Extending the OpenFeature ecosystem with evaluators that handle flagd-compatible feature flag formats.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building a custom flagd evaluator for OpenFeature.
This is a pure contract package with no vulnerabilities, permissive licensing, and active maintenance. Install only if you need to implement the Evaluator protocol; it is not a standalone tool but a dependency for evaluator development.
Install
openfeature-flagd-api on PyPI
Before you install
Low install friction with a single runtime dependency on openfeature-sdk. Actively maintained as of 2026-08-12 with recent activity.
Requires Python 3.10 or later.
License in practice
Apache 2.0 permissive license allows commercial and private use, modification, and distribution with minimal restrictions—only requiring license and copyright notice preservation.
Quickstart
pip install openfeature-flagd-api
from openfeature.contrib.tools.flagd.api import Evaluator, FlagStoreException
# Implement the Evaluator protocol for custom evaluatorVerify before relying
- Whether the package includes concrete example implementations or reference evaluators beyond the protocol definition.
- API stability guarantees or semantic versioning policy for the protocol contract.
- Integration testing guidance or compatibility matrix with specific flagd versions.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageopenfeature-sdk |
| Maintenance | Actively maintained 106 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 208,621 / month, #9,529 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: Apache Software LicenseProgramming Language :: PythonProgramming Language :: Python :: 3 |
Evidence: openfeature_flagd_api-1.0.0-py3-none-any.whl
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See also openfeature-flagd-core · openfeature-provider-flagd · openfeature-sdk · openfeature-provider-flagsmith · openfeature-provider-ofrep · openfeature-provider-unleash · launchdarkly-openfeature-server · openfeature-hooks-opentelemetry · pydantic-evals