docs: add API reference for GET /v1/request/{requestId}/inputs

[chitalian]

Summary

• Adds docs page for the new GET /v1/request/{requestId}/inputs endpoint (shipped in feat(api): add GET /v1/request/{requestId}/inputs endpoint #5566)
• Adds the page to the Request section in the API Reference navigation

Context

This endpoint lets users retrieve the prompt template inputs (variables) for a past request made through AI Gateway prompt management — enabling testing pipelines that replay requests against new prompt versions without storing inputs separately.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
helicone	Ready	Preview, Comment	Feb 17, 2026 8:15pm
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helicone-eu	Ready	Preview, Comment	Feb 17, 2026 8:15pm

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[supabase]

This pull request has been ignored for the connected project lmahfbbnchpworytrrqk because there are no changes detected in .supabase/supabase directory. You can change this behaviour in Project Integrations Settings ↗︎.

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[claude]

Claude finished @chitalian's task —— View job

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PR Review Complete ✅

Score: 9/10 - Excellent documentation with clear structure and practical examples. Ready to merge.

Review Analysis

I've thoroughly reviewed this documentation PR for the new GET /v1/request/{requestId}/inputs endpoint. The changes include:

1. New MDX documentation file (docs/rest/request/get-v1request-inputs.mdx)
2. Navigation update in docs.json to add the page to the Request section

Strengths

✅ Clear and comprehensive documentation structure

• Well-organized sections: Overview, Use Cases, Response examples
• Proper frontmatter with appropriate titles and descriptions
• Correctly references the OpenAPI spec with openapi: get /v1/request/{requestId}/inputs

✅ Practical use cases and context

• Explains the connection to Prompt Management feature
• Lists concrete use cases: regression testing, prompt comparison, debugging
• Links to relevant documentation (/features/advanced-usage/prompts/overview)

✅ Excellent response documentation

• Shows both successful response with data and null response scenarios
• JSON examples are well-formatted and realistic
• Clearly explains when data would be null

✅ Proper navigation integration

• Correctly added to the Request section in API Reference at line 327
• Maintains alphabetical ordering within the group
• Follows existing navigation patterns

✅ Important user guidance

• Includes EU API warning snippet (consistent with other endpoints)
• Notes 90-day retention period - critical for users planning testing workflows

Minor Observations

• The version_id example uses truncation (1c7a86c8-...) which is fine for documentation
• All internal links are properly formatted
• Follows Helicone's documentation style and conventions

Technical Accuracy

The documentation correctly describes the endpoint's purpose and behavior:

• Retrieves inputs for requests made through AI Gateway prompt management
• Returns null when no inputs are associated (non-prompt-managed requests)
• Proper JSON response structure matches typical Helicone API patterns

Suggestions Summary

No critical issues found. This is high-quality documentation that:

• Provides clear value proposition for the endpoint
• Includes practical examples developers can use immediately
• Follows established documentation patterns
• Properly integrates with existing navigation

The documentation is ready for merge and will help users effectively utilize this new endpoint for testing and debugging workflows.

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