What is tessera?
tessera is a Claude Code mod by OG-Matcha that one mod for Claude Code, Windows and CJK first: pasted-image and text previews in any terminal, themed replies with CJK-correct tables and charts, long edit diffs folded, unfinished tasks. It is listed under Security and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | OG-Matcha |
| Repository | OG-Matcha/tessera |
| Popularity | no public popularity data yet |
| Category | Security |
| Security | High risk (48/100) |
| Rank | #4,189 of 5,272 Claude Code mods; #437 in Security |
| License | MIT |
| Last commit | 2026-10-16 |
| Hooks | 9 events |
| Sees | Agent calls, Bash calls, PowerShell calls, TaskCreate calls, TaskStop calls, TaskUpdate calls, TodoWrite calls, Workflow calls, compaction, every prompt, every tool call, mcp__tessera__inbox_fixed calls |
| Draws on | AbovePrompt, Pane, ToolResult, UserMessage, ToolGroup, ToolUse, TurnDuration, CommandOutput, AssistantMessage |
Is tessera safe to install?
tessera scores 48/100 on the MCPMods security check: High risk. Things to review: starts processes outside the sandbox; writes files or config; reads environment variables; watches every prompt or event. It passed 3 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts processes outside the sandbox | Review |
| Writes files or config | Review |
| Reads environment variables | Review |
| Watches every prompt or event | Review |
| Drives Claude (model calls, prompts) | Note |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.clock.every | |
$.clock.now | |
$.command.register | |
$.config.set | changes config |
$.env.get | reads env vars |
$.env.set | sets env vars |
$.fs.exists | reads files |
$.fs.list | reads files |
$.fs.read | reads files |
$.fs.stat | reads files |
$.model.classify | drives Claude |
$.process.run | runs processes |
$.prompt.fill | writes the prompt box |
$.prompt.read | |
$.session.cwd | |
$.session.id | |
$.session.messages | reads the transcript |
$.session.repo | |
$.session.usage | |
$.settings.read | reads settings |
$.state.get | |
$.state.set | |
$.store.delete | keeps its own state |
$.store.get | keeps its own state |
$.store.keys | keeps its own state |
$.store.set | keeps its own state |
$.tool.register | drives Claude |
$.ui.close | draws interface |
$.ui.copy | draws interface |
$.ui.invalidate | draws interface |
$.ui.open | draws interface |
$.ui.resolve | draws interface |
$.ui.status | draws interface |
$.ui.toast | draws interface |
How do I install tessera?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/OG-Matcha/tessera claude plugin validate ./tessera/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add OG-Matcha/tessera && claude plugin install tessera@og-matcha
Or ask Claude to set it up
Paste this into Claude Code and it installs tessera for you:
Install the "tessera" Claude Code mod from https://github.com/OG-Matcha/tessera. Run claude plugin validate on it first and show me what it can access before you enable it.