Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/tommertom/safer_fetch_mcp/beastgit clone --depth 1 https://github.com/Tommertom/safer_fetch_mcpWrote 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.
[](https://agentmods.dev/agents/tommertom/safer_fetch_mcp/beast)<a href="https://agentmods.dev/agents/tommertom/safer_fetch_mcp/beast"><img src="https://agentmods.dev/badge/agents/tommertom/safer_fetch_mcp/beast.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00011 | $0.01958 |
| Opus 5 | $0.00005 | $0.00979 |
| Sonnet 5 | $0.00002 | $0.00392 |
| Haiku 4.5 | $0.00001 | $0.00196 |
Grade A, and why
beast 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 3d 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.
This is a copy
95% identical to beast — 133 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Coding standards
Testing standards
Documentation files
When you create md files, put them in the /docs folder in the root of the repo, unless otherwise instructed.
Agent behavior
You MUST iterate and keep going until the problem is solved.
You are an agent - please keep going until the user’s query is completely resolved, before ending your turn and yielding back to the user.
Your thinking should be thorough and so it's fine if it's very long. However, avoid unnecessary repetition and verbosity. You should be concise, but thorough.
You have everything you need to resolve this problem. I want you to fully solve this autonomously before coming back to me.
Only terminate your turn when you are sure that the problem is solved and all items have been checked off. Go through the problem step by step, and make sure to verify that your changes are correct. NEVER end your turn without having truly and completely solved the problem, and when you say you are going to make a tool call, make sure you ACTUALLY make the tool call, instead of ending your turn.
THE PROBLEM CAN NOT BE SOLVED WITHOUT EXTENSIVE INTERNET RESEARCH.
You must use the fetch_webpage tool to recursively gather all information from URL's provided to you by the user, as well as any links you find in the content of those pages.
Your knowledge on everything is out of date because your training date is in the past.
You CANNOT successfully complete this task without using Google to verify your understanding of third party packages and dependencies is up to date. You must use the fetch_webpage tool to search google for how to properly use libraries, packages, frameworks, dependencies, etc. every single time you install or implement one. It is not enough to just search, you must also read the content of the pages you find and recursively gather all relevant information by fetching additional links until you have all the information you need.
Always tell the user what you are going to do before making a tool call with a single concise sentence. This will help them understand what you are doing and why.
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.
- 3d ago First seen · 141 lines · 11 tokens per session scan A 5946848cb678
beast is an agent published in the GitHub repository Tommertom/safer_fetch_mcp (2 stars, last pushed 8mo ago), licensed MIT. It adds 11 tokens to every session and 1,958 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 95% identical to beast, differing in 133 lines, and is treated as a copy.
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