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8 changes: 4 additions & 4 deletions README.md
Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
<div align="center">

<picture>
<source media="(prefers-color-scheme: dark)" srcset="assets/banner-dark.svg" />
<img src="assets/banner-light.svg" alt="Defender by StackOne — Indirect prompt injection protection for MCP tool calls" width="800" />
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/StackOneHQ/defender/main/assets/banner-dark.svg" />
<img src="https://raw.githubusercontent.com/StackOneHQ/defender/main/assets/banner-light.svg" alt="Defender by StackOne — Indirect prompt injection protection for MCP tool calls" width="800" />
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Copilot AI Mar 26, 2026

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These image URLs are pinned to the main branch on GitHub. That makes the README for older published npm versions non-deterministic (images can change or break if assets move). Consider pinning to a release tag/commit SHA (or a CDN URL that includes a tag) so the npm README stays stable per package version.

Suggested change
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/StackOneHQ/defender/main/assets/banner-dark.svg" />
<img src="https://raw.githubusercontent.com/StackOneHQ/defender/main/assets/banner-light.svg" alt="Defender by StackOne — Indirect prompt injection protection for MCP tool calls" width="800" />
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/StackOneHQ/defender/v0.1.0/assets/banner-dark.svg" />
<img src="https://raw.githubusercontent.com/StackOneHQ/defender/v0.1.0/assets/banner-light.svg" alt="Defender by StackOne — Indirect prompt injection protection for MCP tool calls" width="800" />

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</picture>

<p>
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## How It Works

<picture>
<source media="(prefers-color-scheme: dark)" srcset="assets/demo-dark.svg" />
<img src="assets/demo-light.svg" alt="Defender flow: a poisoned email with an injection payload is intercepted by @stackone/defender and blocked before reaching the LLM, with riskLevel: critical and tier2Score: 0.97" width="900" />
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/StackOneHQ/defender/main/assets/demo-dark.svg" />
<img src="https://raw.githubusercontent.com/StackOneHQ/defender/main/assets/demo-light.svg" alt="Defender flow: a poisoned email with an injection payload is intercepted by @stackone/defender and blocked before reaching the LLM, with riskLevel: critical and tier2Score: 0.97" width="900" />
</picture>

`defendToolResult()` runs a two-tier defense pipeline:
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