Feature request: add `epics-update` tool for editing existing epics

[afreakk]

Summary

The MCP server supports epics-get-by-id, epics-search, and epics-create, but there is currently no way to update an existing epic.

Problem

Agents can create and read epics, but cannot perform common follow-up actions like:

• rename an epic
• update description
• change owner(s)
• change state (e.g. unstarted/started/done)
• set or clear deadline/team/objective fields (as supported by Shortcut API)

This causes workflows to fail when an agent needs to "update epic" after discovery/planning.

Repro

1. Configure MCP server with write access (not SHORTCUT_READONLY, write-capable API token).
2. Ask agent to update an existing epic.
3. Agent cannot find a write tool for epics other than epics-create.

Expected

A write tool exists for modifying existing epics, e.g.:

• epics-update

with behavior similar to stories-update:

• requires epicPublicId
• accepts only fields to change
• supports nullable/unset where relevant

Notes

As of 2026-02-10, @shortcut/mcp latest on npm is 0.19.0, and this gap appears to be feature coverage rather than an outdated local install.

Thanks for considering this — happy to test if/when implemented.