synthorg: Agent for Claude Code

.claude/agents/prompt-injection-boundary.md

prompt-injection-boundary is an agent for Claude Code from Aureliolo/synthorg. It costs 82 tokens per session (2,041 once invoked), scanned A, original, no licence file.

A security-review agent for checking how untrusted content is separated from instructions at language-model and tool boundaries.

In plain words
What is it for?
Reviewing prompt-injection protections, inbound chat fencing, credentialed tool governance, gateway binding, agent-tool visibility, and repository scoping.
Why use it?
It detects cases where messages, repository content, credentials, or tool access could improperly influence an agent.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is Aureliolo/synthorg's own configuration. It tells Claude Code how to work on synthorg itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything synthorg configures →

Reuse

Borrowing it

Nothing to install: this file belongs to Aureliolo/synthorg. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Aureliolo/synthorg/main/.claude/agents/prompt-injection-boundary.md
Clone the repo
git clone --depth 1 https://github.com/Aureliolo/synthorg

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for prompt-injection-boundary

README.md
[![agentmods](https://agentmods.dev/badge/agents/aureliolo/synthorg/prompt-injection-boundary/github.svg)](https://agentmods.dev/agents/aureliolo/synthorg/prompt-injection-boundary)
Your own site
<a href="https://agentmods.dev/agents/aureliolo/synthorg/prompt-injection-boundary"><img src="https://agentmods.dev/badge/agents/aureliolo/synthorg/prompt-injection-boundary/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for prompt-injection-boundary

Your own site · 80×15
<a href="https://agentmods.dev/agents/aureliolo/synthorg/prompt-injection-boundary"><img src="https://agentmods.dev/badge/agents/aureliolo/synthorg/prompt-injection-boundary.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,041 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00082 $0.02041
Opus 5.5 $0.00033 $0.00816
Sonnet 5.5 $0.00016 $0.00408
Haiku 4.5 $0.00008 $0.00204

Measured 2mo ago against content hash d831a334e5d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

prompt-injection-boundary scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/agents/prompt-injection-boundary.md · 152 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 152 lines · 82 tokens per session scan A d831a334e5d9

Subscribe to this mod's changes

prompt-injection-boundary is an agent published in the GitHub repository Aureliolo/synthorg (10 stars, last pushed 1mo ago), with no licence file. It adds 82 tokens to every session and 2,041 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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