Adds a first-class registerTool (R14 'proper tool usage') so the Pi
agent can load its active Mosaic mission, milestone progress, task
counts, and latest scratchpad as a tool call before planning — instead
of shelling out or guessing. Reuses detectMission/buildMissionSummary;
returns AgentToolResult text + structured details. promptGuidelines
names the tool explicitly per the pi extension authoring contract.
Tool shape verified against @earendil-works/pi-coding-agent@0.79.9
ToolDefinition (name/label/description/promptSnippet/promptGuidelines/
parameters + execute(toolCallId,params,signal,onUpdate,ctx)).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83
Jason Woltje
b26bbb02e9