feat: add create/update dashboard tools to MCP server (#23)

[pkalsi97]

This PR fullfills both requirement of the issue (#23)

Summary

• In internal/handler/tools/handler.go - Adds create_dashboard MCP tool. Validates input, decodes JSON into types.Dashboard, calls SigNoz API, returns result or error.
• In pkg/types - Adds dashboard.go which Defines Dashboard schema used by the MCP tool. Contains layout, variables, and widgets with JSON and jsonschema annotations for validation and UI generation.
• In internal/client/client.go - Adds CreateDashboard which Creates a dashboard by POSTing the marshaled Dashboard JSON to SigNoz. Sets auth header, applies timeout, returns raw API response or error.
• Updates README.md with necessary details

DEMO

DEMO 1

demo_1.mp4

DEMO 2

demo_2.mp4

Followup

@pranay01 @pradeepitm12 Let me know if this is satisfactory. If yes, I’ll add the Update Dashboard tool in the same PR.

[pradeepitm12]

Hi @pkalsi97, sorry for the delay in review.
Could you please rebase (if not done already)
Interesting demo, as you mention sometimes wrong json being created, try to provide some example of expected json that way LLM would correct the json immediately.
Allow me some time to review the code later today.

[pkalsi97]

@pradeepitm12

The error

Parameter decoding error: The provided JSON structure for the dashboard configuration is invalid. Error details: json: cannot unmarshal string into Go struct field Widget.widgets.nullZeroValues of type bool

video

https://www.loom.com/share/46a1babb50b24f8e977231dd8c582b97

I think the failure is entirely from LLM-produced JSON, what you think?

[pkalsi97]

Update Dashboard Tool

@trashhalo @pradeepitm12 , I have added update dashboard tool.

Here is a video of its working
https://www.loom.com/share/e29246903e25469e9eda2907a9e10d2e

So both the objectives of the Issue #23 have been fulfilled.