fix!: make targetingKey optional in the evaluation context

[jonathannorris]

Summary

• Removes required: [targetingKey] from the context schema, restoring the optional targetingKey that feat: add optional targeting key property #30 originally added.
• Updates the schema description and the three INVALID_CONTEXT examples that described a missing targetingKey as a malformed request.

The required block was introduced in #56, a docs PR updating descriptions and examples, and was never discussed. It contradicts the OpenFeature specification, which defines the targeting key as optional.

Spec Reference

Evaluation context, requirement 3.1.1 defines an optional targeting key field on the evaluation context.

Related Issues

Relates to #29, #30

Slack discussion: https://cloud-native.slack.com/archives/C066A48LK35/p1790685493252189

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📝 Walkthrough

Walkthrough

The OpenAPI specification advances from version 0.3.0 to 0.4.0. The context schema no longer requires targetingKey, and three INVALID_CONTEXT examples now describe a wrong-type plan property.

Changes

Context validation

Layer / File(s)	Summary
Context contract and error examples service/openapi.yaml	The specification version changes to 0.4.0. The context schema describes targetingKey as optional and removes it from the required list. The single-evaluation, bulk-evaluation, and bulkEvaluationFailure examples report a wrong-type plan property.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to 5bffc

The examples may mislead API clients about valid contexts; update them before merging if documentation accuracy is required.

Architecture Summary

Architecture risk: 🔵 Low · up to 5bffc

The change affects 1 system.

Changed systems: service

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — service (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in service/openapi.yaml: The specification version changes from 0.3.0 to 0.4.0.
• observed — Modified behavior in service/openapi.yaml: The single-evaluation INVALID_CONTEXT example changes from a missing-targetingKey error to a plan property type error.
• observed — Modified behavior in service/openapi.yaml: The bulk-evaluation INVALID_CONTEXT example changes from a missing-targetingKey error to a plan property type error.
• observed — Modified behavior in service/openapi.yaml: The bulkEvaluationFailure example changes from a missing-targetingKey error to a plan property type error.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: making targetingKey optional in the evaluation context.
Description check	✅ Passed	The description directly explains the schema change, related example updates, specification reference, and related issues.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The schema and examples consistently reflect the intended optional targeting key behavior.

Review effort: Balanced
Findings: None

What changed in this PR

Makes targetingKey optional in evaluation contexts, aligning OFREP with the OpenFeature specification.

Changes:

• Removes targetingKey from required context properties.
• Updates context documentation and invalid-context examples.

File	Description
service/​openapi.yaml	Makes targetingKey optional and updates related documentation examples.

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Actionable comments posted: 1

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Inline comments:
Review comments at @service/openapi.yaml:
- Line 91: Update the errorDetails messages in all three invalid-context
examples in the context section to identify targetingKey as the property that
must be a string, replacing the current plan reference.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 4ca39d61-1f9d-42e1-a1c9-16d77548f818

📥 Commits

Reviewing files that changed from the base of the PR and between 56d798e and 5bffcec.

📒 Files selected for processing (1)

• service/openapi.yaml

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[lukas-reining]

Makes sense!

[erka]

Is this a breaking change? I believe the spec was never required targetingKey in the context originally. It was added in #56 as the documentation effort.

[dferber90]

🙏

[jonathannorris]

Is this a breaking change? I believe the spec was never required targetingKey in the context originally. It was added in #56 as the documentation effort.

I'd probably consider this enough of a change that a minor bump (we are sub 1.0) is required, I actually don't expect many vendors to have implemented this as required.

It does make some require some changes to the caching behaviours described in ADR-009 and in the OFREP JS provider. Working on a separate PR for that.