## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - Operators often open self-hosted Paperclip over plain HTTP on a LAN
or private network.
> - Browser Clipboard API writes are not reliable in that insecure
context.
> - Paperclip already has one shared helper with a legacy copy fallback,
but many current copy actions bypass it.
> - This pull request routes every core UI copy action and the
first-party workspace-diff plugin through the shared helper.
> - The benefit is consistent copy behavior on HTTPS, localhost, and
plain-HTTP private deployments.
## Linked Issues or Issue Description
Refs #3529.
This change supersedes the stale prior attempt in #3531. Current master
has more copy surfaces and a first-party plugin UI bridge that the prior
branch does not cover.
## What Changed
- Replaced direct Clipboard API writes and duplicate fallback
implementations across the current core UI with `copyTextToClipboard`.
- Added an HTTP-safe clipboard function to the plugin UI SDK and wired
the host bridge to the same implementation.
- Migrated the first-party workspace-diff plugin to the plugin SDK
clipboard function.
- Added unit coverage for native rejection fallback and plugin host
delegation.
- Added a source-level regression test that rejects new direct clipboard
writes outside the shared implementation.
- Documented the plugin UI clipboard function.
## Verification
- `NODE_ENV=test pnpm exec vitest run ...` for 14 affected suites: 164
tests passed.
- `pnpm exec vitest run tests/ui-clipboard.test.ts` in
`packages/plugins/sdk`: 1 test passed.
- `NODE_ENV=test pnpm -r typecheck`: passed for 31 workspace projects.
- `NODE_ENV=test pnpm test:run`: passed.
- `NODE_ENV=production pnpm build`: passed.
- `pnpm check:token-gates`: passed with all gates clean.
## Risks
Low risk. Secure contexts still use the modern Clipboard API. Plain HTTP
and rejected modern writes use the existing `execCommand("copy")`
fallback. That API is deprecated, but it is the compatibility path
required for insecure contexts. The change has no schema, API, or visual
design effect.
> 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 Codex, `gpt-5.6-sol`. The runtime did not expose a context-window
size. Reasoning, tool use, repository editing, test execution, and
GitHub CLI access were enabled.
## 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>
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