Synthesis Skill

VCS Provider

This skill uses VCS operations through Exarchos MCP actions (create_pr, merge_pr, list_prs, check_ci, etc.). These actions automatically detect and route to the correct VCS provider (GitHub, GitLab, Azure DevOps). No gh/glab/az commands needed — the MCP server handles provider dispatch.

Not to be confused with the integration merge. This skill calls merge_pr to land a user-facing PR on main via the VCS provider — a remote operation. The upstream sibling is serialize_merge (@skills/merge-orchestrator/SKILL.md): the integration-merge path that holds a single-writer lease and composes a local git merge of a subagent worktree branch onto the integration branch during the delegate → merge-pending → delegate HSM loop (raw merge_orchestrate is that composed executor / the non-integration path). Synthesize never invokes serialize_merge or merge_orchestrate; merge-pending never invokes merge_pr.

Overview

Submit stacked PRs after review phase completes. The prepare_synthesis composite action consolidates readiness checks, stack verification, test validation, and quality signal analysis into a single call -- eliminating the multi-script coordination that historically caused synthesis failures.

Prerequisites:

• All delegated tasks complete with reviews passed (spec + quality)
• The integration branch already exists from delegation phase
• Task branches present and pushed to remote