Add filtering by epic_id and story_id to get_tasks MCP tool

[JanJetze]

Problem

The get_tasks MCP tool currently only supports filtering by status and priority. There's no way to query:

• Tasks belonging to a specific epic
• Tasks belonging to a specific story
• Stories belonging to a specific epic

Current Behavior

// get_tasks parameters
{
  status?: "todo" | "in_progress" | "review" | "done" | "blocked",
  priority?: "P0" | "P1" | "P2" | "P3",
  limit?: number
}

The returned task objects do include epic_id, epic_title, story_id, and story_title fields, but there's no way to filter by them.

Proposed Solution

Add optional filter parameters to get_tasks:

{
  status?: string,
  priority?: string,
  epic_id?: string,    // NEW: filter tasks by epic
  story_id?: string,   // NEW: filter tasks by story
  limit?: number
}

Additionally, consider adding:

• get_stories tool with optional epic_id filter
• get_epics tool to list all epics

Use Case

When working on a specific epic (e.g., "Settings Screen Redesign"), I need to see only the tasks and stories related to that epic, not the entire backlog. Currently this requires fetching all tasks and filtering client-side, which is inefficient.

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