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## Thinking Path > - Paperclip manages AI agents and their access to external tools. > - Connection methods define operator settings and managed tool arguments. > - Setup, catalog discovery, and gateway invocation must use the same projection rules. > - These rules were embedded in a large database service. > - This PR gives them one module with a narrow settings contract. > - Existing provider policy modules still decide their provider-specific restrictions. ## Linked Issues or Issue Description **What existing behavior does this improve?** Connection method configuration and tool input projection. **Current behavior** The tool-access database service owns settings validation and pure input/schema transforms. Callers import these through the service. **Proposed behavior** A connection-method module owns these transforms and accepts only connection settings. Existing imports remain compatible. This PR depends on #17144 and targets its branch. Review only this PR's diff. It is part 2 of the three-PR stack. #17147 follows this PR. ## What Changed - Move method selection, settings validation, and header/schema/argument projection into `tool-access/connection-methods.ts`. - Replace database row parameter types with required config and transport settings. No new validation is added inside typed calls. - Keep Honcho, Google Chat, and Gmail policy in their existing modules. Preserve their call order. - Retain the service's public exports for routes, gateway consumers, and tests. - Reduce `tool-access.ts` from 21,237 lines / 820,116 bytes to 20,917 lines / 808,777 bytes. The new module is 359 lines / 12,665 bytes. ## Verification - Baseline: all 466 tool-access service tests and 80 protocol/provider-policy cases pass before the move. - After: `pnpm exec vitest run server/src/__tests__/tool-access-service.test.ts server/src/__tests__/memory-connectors.test.ts server/src/services/google-chat-tool-policy.test.ts server/src/services/gmail-tool-governance.test.ts` — 506 tests pass with one worker and disposable PostgreSQL. - `pnpm --filter @paperclipai/server exec tsc --noEmit` passes after the existing workspace prerequisites were built. - AST body comparison confirms the 11 moved functions and private record parser are unchanged. `git diff --check` passes. - The first typecheck found optional config in the public DTO. The new input type now states the existing required-config invariant directly. - Final-stack local verification: `pnpm -r --workspace-concurrency=2 typecheck` and `pnpm build` pass. Greptile is 5/5 at `2d0bb86b5830c0306580e3ddc8637c4994b2a75a` with no actionable findings. - CI passed all non-browser gates. [The first browser attempt](https://github.com/paperclipai/paperclip/actions/runs/39675461620/job/119484152569) failed in the unchanged Cases read-only test: the status filter remained All statuses while the announcement-dismiss locator handler interrupted the assertion. The same test passed on #17144. The failure log is preserved. One retry of only the failed jobs passed without code changes; all CI gates are now green on the same head. - Full local-suite limitation: `pnpm test:run` was interrupted after 79 minutes during the serial general-server phase, after CI had completed the full test matrix. Before interruption, it flagged the unchanged `company-search-service.test.ts` suite (26 database cases skipped). One isolated rerun passed all 28 cases without code changes. The original log and a pre-interruption copy are preserved. The original failure cause was not reproduced. The full local suite and its later groups are not claimed as passed; the complete CI matrix is green on this stack. ## Risks - A projection-order change could alter managed arguments or advertised schemas. Function bodies and call order are unchanged, and tests exercise setup, discovery, and gateway consumers. - Legacy Gmail method aliases, GitHub toolset headers, missing unrelated settings, and disabled method filtering retain their previous behavior. - The module has no database dependency, new network work, or mutable state. ## Model Used OpenAI Codex, GPT-6 family, with code execution and repository tools. The exact serving model ID and context-window size are not exposed in this session. ## 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>