# Margin Editor

> Margin Editor is an officially published WebMCP tool from OpenAI. Anomity scores its risk at 10 out of 100 (low).

- **Canonical URL:** https://catalog.anomity.ai/webmcp/openai-margin-editor
- **Kind:** WebMCP tool
- **Publisher:** OpenAI
- **Trust level:** official
- **Risk score:** 10/100 (low)
- **Website:** https://openai.com
- **Last updated:** 2026-09-02
- **JSON:** https://catalog.anomity.ai/api/entries/webmcp/openai-margin-editor

## Description

A local note editor in which the agent has its own identity: it creates notes and responds in the margin as a distinct participant rather than silently editing the user's text. A deliberate demonstration that agent-native does not have to mean agent-invisible.

That identity separation is the interesting security property. When agent output is attributable and spatially separated from human content, prompt-injected text the agent produces is visibly the agent's, not the user's — which matters enormously for documents that later feed other systems. Declared capabilities are browser control and outbound network access. It is catalogued as the design pattern worth copying: mark what the model wrote.

## Why it scored 10

The score starts at the catalog's neutral base of 50 and moves only through the signals below. The formula is published at https://catalog.anomity.ai/about — there is no model and no hidden heuristic.

| Signal | Contribution | Severity | Evidence |
| --- | --- | --- | --- |
| Published by the vendor | -40 | trust offset |  |

Clamped result: **10/100**, band **low**.

## Capabilities

| Capability | Name | Security implication |
| --- | --- | --- |
| `browser:control` | Browser control | Drives a browser session. Combined with credential access can impersonate the user on web services. |
| `network:outbound` | Outbound network | Can make outbound network requests. Required for hosted model providers and remote APIs; also the path for data exfiltration if combined with read access. |

## Related WebMCP tools

- [Latch](https://catalog.anomity.ai/webmcp/latch-webmcp) — risk 40 (medium)
- [Model Context Tool Inspector](https://catalog.anomity.ai/webmcp/model-context-tool-inspector) — risk 40 (medium)
- [nekuda WebMCP Workbench](https://catalog.anomity.ai/webmcp/nekuda-webmcp-workbench) — risk 40 (medium)
- [WebMCP Bridge](https://catalog.anomity.ai/webmcp/webmcp-bridge) — risk 40 (medium)
- [WordLift AI Audit](https://catalog.anomity.ai/webmcp/wordlift-ai-audit) — risk 40 (medium)
- [WebMCP Evals](https://catalog.anomity.ai/webmcp/webmcp-evals) — risk 20 (low)

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Source: Anomity Catalog (https://catalog.anomity.ai/). Scoring methodology: https://catalog.anomity.ai/about. Machine-readable index: https://catalog.anomity.ai/llms.txt · https://catalog.anomity.ai/openapi.json