chore: update atlas tools output to json - MCP-264

[blva]

Proposed changes

• updates the atlas tool responses to return json instead of tables

Checklist

• I have signed the MongoDB CLA

[coveralls]

Pull Request Test Coverage Report for Build 18978566012

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 37 of 60 (61.67%) changed or added relevant lines in 6 files are covered.
• 46 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+0.2%) to 80.142%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/tools/atlas/read/listDBUsers.ts	16	18	88.89%
src/tools/atlas/read/listClusters.ts	1	10	10.0%
src/tools/atlas/read/listAlerts.ts	0	12	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/tools/atlas/read/listAlerts.ts	1	65.12%
src/tools/atlas/read/listClusters.ts	1	60.64%
src/tools/mongodb/create/createIndex.ts	2	97.93%
src/common/config.ts	6	92.11%
src/tools/tool.ts	9	78.64%
eslint.config.js	10	0.0%
src/common/search/vectorSearchEmbeddingsManager.ts	17	85.21%

Totals
Change from base Build 18966929073:	0.2%
Covered Lines:	6428
Relevant Lines:	7901

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💛 - Coveralls

[Copilot]

Pull Request Overview

This PR updates Atlas tools to return JSON-formatted data instead of table-formatted output, improving machine readability and consistency.

Key Changes:

• Replaced table-formatted output with JSON.stringify() for all Atlas tool responses
• Updated integration tests to validate JSON content instead of parsing tables
• Removed unused table parsing utility function

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/tools/atlas/read/listOrgs.ts	Converts organization list output from table to JSON format
src/tools/atlas/read/listDBUsers.ts	Converts database users output from table to JSON, removes helper functions
src/tools/atlas/read/listClusters.ts	Converts cluster list output from table to JSON for both all-projects and single-project views
src/tools/atlas/read/listAlerts.ts	Converts alerts output from table to JSON format
src/tools/atlas/read/inspectCluster.ts	Converts cluster details output from table to JSON format
src/tools/atlas/read/inspectAccessList.ts	Converts access list entries output from table to JSON format
tests/integration/tools/atlas/orgs.test.ts	Updates test to validate JSON content instead of parsing tables
tests/integration/tools/atlas/clusters.test.ts	Updates tests to validate JSON content, removes table parsing logic
tests/integration/tools/atlas/alerts.test.ts	Updates test description and assertions to expect JSON format
tests/integration/tools/atlas/atlasHelpers.ts	Removes unused parseTable helper function

[jeroenvervaeke]

In other commands we return null/undefined, could we do that for all tools?

[gagik]

That's an interesting point. having these human-readable make it easier to parse from both human and LLM perspective I'd think. If there's both null and undefined cases which mean different things then it's worth keeping or handling them differently but otherwise I don't have strong feelings about it.

[blva]

ack, I'll keep "N/A" like the previous implementation everywhere then! thanks for flagging

[jeroenvervaeke]

Same remark, can we avoid mixing null and N/A?