Skillbox: One library for your AI skills, synced to every agent
Skillbox launched on Product Hunt on November 11, 2026, aimed at developers whose AI skill files sit in too many places. According to the product listing, the maker's skills lived across GitHub repositories and project folders, and some were installed for Claude Code but missing from Cursor. Skillbox places them in one library that records where each skill came from, then delivers a chosen active set to Claude Code, Cursor and Codex on each connected machine. A skill can be limited to one project folder rather than synced to every tool. Users can import skills already on their computer, add them from GitHub or GitLab, or pick from an Explore section. Its only MCP configuration entry is its own control-plane server, named skillbox, written in each tool's own format.
The second feature, Trim, targets context cost. It shortens noisy test, git and build output before the agent reads it, and the full output stays on the local machine. When a command fails, the complete output is saved locally, a hint points to it, and the agent can retrieve it with one command. Output filters can be switched off per command, and a filter that errors falls back to the raw output. The listing says Trim can drop lines and covers more tools than the three named, though its session insights are deepest on Claude Code.
Why it matters
For teams building on coding agents, skill files are becoming a working asset that needs provenance, review and distribution, not a folder of prompts. A library that tracks origin and shows diffs before updates lets builders standardise setups across Claude Code, Cursor and Codex, which lowers the cost of switching between agents. The same portability cuts the other way: a vendor-neutral layer can also move a team's skills away from any single tool.
For investors and sellers, the more important signal is where the value sits. Skillbox does not replace the agents. It sits between them and the repositories, a position the agent vendors could copy by adding native sync. Founders selling skills or agent tooling should expect buyers to ask for source tracking, diff review and injection scanning as baseline features, because skills act as instructions with access to the agent's tools.
Key points
- 1Syncs one skill library to Claude Code, Cursor and Codex on connected machines.
- 2A permanent free plan covers the library, sync, updates and Trust.
- 3Trim and AI features are on the Individual plan with a 7-day trial.
- 4The Skillbox site lists Trim and AI from £6.99 per month.
- 5Trim shortens test, git and build output, and keeps full output locally for failed commands.
