story-kit: queue 177_bug_no_mcp_tool_to_edit_story_acceptance_criteria for merge

.story_kit/work/4_merge/177_bug_no_mcp_tool_to_edit_story_acceptance_criteria.md

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+---
+name: "No MCP tool to edit story acceptance criteria"
+---
+
+# Bug 177: No MCP tool to edit story acceptance criteria
+
+## Description
+
+There is no MCP tool to add or edit acceptance criteria on a story file. When the supervisor or a human working through Claude Code wants to update a story's ACs, they have to fall back to raw file editing tools (Edit, Write, sed, etc). This creates unnecessary friction and permission issues — file write tools require sandbox approval and can fail due to permission handshake bugs. Story metadata mutations should go through dedicated MCP actions, same as create_story, check_criterion, and record_tests do.
+
+## How to Reproduce
+
+1. Try to add an acceptance criterion to an existing story
+2. No MCP tool exists for this — must use Edit/Write tools on the raw markdown file
+3. If sandbox permissions are broken, the edit is completely blocked
+
+## Actual Result
+
+No MCP tool for editing story content. Must use raw file manipulation which is fragile and permission-dependent.
+
+## Expected Result
+
+An MCP tool (e.g. add_criterion or edit_story) that can add/remove/update acceptance criteria on a story file without needing raw file write permissions.
+
+## Acceptance Criteria
+
+- [ ] An MCP tool exists to add acceptance criteria to a story file
+- [ ] An MCP tool exists to update the story description or user story text
+- [ ] These tools auto-commit changes to the story file like other story-kit MCP tools do