feat: update manifest parameters to accept YAML string or file path

[aaronsteers]

fix: revert parameter names from manifest_input to manifest

Summary

This PR reverts parameter names from manifest_input back to manifest across all affected functions in the connector builder MCP server, as requested by @aaronsteers in PR feedback. The changes maintain the string input functionality that accepts either raw YAML content or file paths while restoring the original parameter naming convention.

Key Changes:

• Reverted parameter names in validate_manifest(), execute_stream_test_read(), get_resolved_manifest(), and populate_dotenv_missing_secrets_stubs()
• Updated function signatures, docstrings, and internal variable references
• Fixed OSError handling in parse_manifest_input() to properly catch "File name too long" errors when YAML strings are mistaken for file paths
• Updated test function calls and assertions to use the reverted parameter names

The core auto-detection logic that distinguishes between YAML strings and file paths remains unchanged, preserving the context window optimization benefits for LLMs.

Review & Testing Checklist for Human

• Test auto-detection with edge cases: Verify the system correctly handles very long YAML strings, file paths that contain YAML-like content, and unusual file formats
• Verify parameter consistency: Check that all function calls across the codebase use the correct manifest parameter name (no lingering manifest_input references)
• Test error handling scenarios: Confirm that file system errors are properly reported and that the OSError catch doesn't mask legitimate issues
• End-to-end workflow validation: Test the complete manifest validation, stream testing, and secrets management workflows with both YAML strings and file paths

Recommended Test Plan:

1. Test with a real YAML file path to ensure file loading works
2. Test with raw YAML string content to ensure parsing works
3. Test with invalid file paths and malformed YAML to verify error handling
4. Test the secrets management functions with manifest-based auto-detection

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    A["connector_builder_mcp/_connector_builder.py"]:::major-edit
    B["connector_builder_mcp/_secrets.py"]:::major-edit
    C["connector_builder_mcp/_util.py"]:::major-edit
    D["tests/test_secrets.py"]:::minor-edit
    E["tests/test_integration.py"]:::minor-edit
    F["parse_manifest_input()"]:::context
    
    A -->|calls| F
    B -->|calls| F
    C -->|contains| F
    D -->|tests| B
    E -->|tests| A
    
    subgraph Legend
        L1[Major Edit]:::major-edit
        L2[Minor Edit]:::minor-edit
        L3[Context/No Edit]:::context
    end

classDef major-edit fill:#90EE90
classDef minor-edit fill:#87CEEB  
classDef context fill:#FFFFFF

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Notes

• All local tests pass (63/63) and CI checks are green
• The OSError handling fix was critical to resolve the "File name too long" error that occurred when trying to create Path objects from YAML string content
• This change addresses specific feedback from @aaronsteers while maintaining the improved API functionality
• Session: https://app.devin.ai/sessions/ba10520228444842884d3101bcb49827
• Requested by: @aaronsteers (AJ Steers)

Important

Auto-merge enabled.

This PR is set to merge automatically when all requirements are met.

[devin-ai-integration]

Original prompt from AJ Steers

@Devin - please update the connector builder MCP server. Wherever it currently accepts a manifest JSON/dict, we want it to instead accept either a path or a YAML string. We night need to consider a rename of the arg. We might also consider whether it's better for us to detect whether we have a path vs a YAML string, vs just splitting into two mutually exclusive input args 

Goal is to not clog up the context by forcing the LLM to convert their YAML into JSON each time. And if they have a path pointer, that further reduces expansion of the context window

[devin-ai-integration]

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[github-actions]

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Testing This Branch via MCP

To test the changes in this specific branch with an MCP client like Claude Desktop, use the following configuration:

{
  "mcpServers": {
    "connector-builder-mcp-dev": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/airbytehq/connector-builder-mcp.git@devin/1754507432-yaml-path-manifest-support", "connector-builder-mcp"]
    }
  }
}

Testing This Branch via CLI

You can test this version of the MCP Server using the following CLI snippet:

# Run the CLI from this branch:
uvx 'git+https://github.com/airbytehq/connector-builder-mcp.git@devin/1754507432-yaml-path-manifest-support#egg=airbyte-connector-builder-mcp' --help

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[Copilot]

Pull Request Overview

This PR updates the manifest parameters to accept string input (either raw YAML content or file path) instead of dictionary input, eliminating the need for JSON conversion and reducing context window usage.

• Implements auto-detection logic to distinguish between file paths and raw YAML content
• Updates four main functions to use manifest_input: str parameter instead of manifest: dict[str, Any]
• Converts all test fixtures and assertions to use the new string-based API

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
connector_builder_mcp/_util.py	Adds parse_manifest_input() utility function with auto-detection logic
connector_builder_mcp/_connector_builder.py	Updates three main functions to use string manifest input
connector_builder_mcp/_secrets.py	Updates populate_dotenv_missing_secrets_stubs() to use string manifest input
tests/test_integration.py	Converts test fixtures from YAML objects to file paths or YAML strings
tests/test_secrets.py	Updates test calls to use YAML strings instead of dictionaries

[github-actions]

PyTest Results (Fast)

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 76bcbaf. ± Comparison against base commit beab29a.

♻️ This comment has been updated with latest results.

[github-actions]

PyTest Results (Full)

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 76bcbaf. ± Comparison against base commit beab29a.

♻️ This comment has been updated with latest results.