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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Agents can select company skills and synchronize them to adapter runtimes > - The skill sync API replaced the complete selection without an explicit destructive choice > - Company package import also replaced conflicting skills by default > - These defaults could remove operator edits during setup and import reruns > - This pull request adds explicit assignment merge modes and safe package conflict handling > - The benefit is that reruns preserve operator work unless the caller explicitly requests replacement ## Linked Issues or Issue Description **What existing behavior does this improve?** This change improves agent skill synchronization and company package import. **Subsystem affected** This is a cross-cutting change across the shared contracts, server, CLI, and UI. **Current behavior** Agent skill synchronization replaces the full desired skill set from a modeless request. Package import replaces a conflicting skill when the caller does not select a conflict mode. **Proposed behavior** Agent skill synchronization requires `add`, `remove`, or `replace`. Package import skips conflicts by default. Each imported skill reports whether it was created, renamed, replaced, or skipped. **Reason and benefit** Setup and import reruns must preserve operator edits by default. Explicit destructive modes make data loss less likely and make each outcome inspectable. **Breaking changes** Callers of the agent skill sync API must now send `mode`. Callers that need the former behavior must send `replace`. Package import now uses `skip` when `onConflict` is absent. ## What Changed - Added required `add`, `remove`, and `replace` modes to the shared agent skill sync contract. - Added actionable `422` validation for missing or invalid modes. - Updated first-party UI and CLI callers with explicit modes. - Changed package skill conflict handling to use `skip` by default. - Kept plugin-owned and built-in stock skill imports on explicit `replace`. - Added created, renamed, replaced, and skipped results to company imports. - Added regression coverage for merge modes and package conflict outcomes. ## Verification - `pnpm check:token-gates` - `pnpm -r typecheck` - `pnpm build` - `pnpm test:run:serialized` (128 suites passed) - `pnpm --filter @paperclipai/skills-catalog test` (20 tests passed) - Focused agent skill route, company skill service, portability, CLI, and UI tests passed. - GitHub CI passed build, typecheck, canary, all general and serialized test shards, all browser shards, policy, security, and final verification on commit `2cfbb3e4c5`. - Greptile reviewed the latest commit at 5/5 with zero unresolved threads. ## Risks - This change intentionally rejects modeless agent skill sync requests. - The safe package default can leave an existing skill unchanged where the old default overwrote it. - All first-party callers now select a mode. Regression tests cover each outcome. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used - OpenAI `gpt-5.6-sol` through Codex. The runtime used agentic reasoning, tool use, code execution, and repository editing. The runtime did not expose the context window size. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] All Paperclip CI gates are green - [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Paperclip <noreply@paperclip.ing>