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/evalstate/fast-agent/indexgit clone --depth 1 https://github.com/evalstate/fast-agentWhat 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 | $0.00000 | $0.00243 |
| Opus 5 | $0.00000 | $0.00121 |
| Sonnet 5 | $0.00000 | $0.00049 |
| Haiku 4.5 | $0.00000 | $0.00024 |
Grade A, and why
index 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 yesterday.
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.
What it actually says
Files and Resources
Attaching Files
You can include files in a conversation using Paths:
from fast_agent import Prompt
from pathlib import Path
plans = await agent.send(Prompt.user("Summarise this PDF", Path("secret-plans.pdf")))
This works for any mime type that can be tokenized by the model.
MCP Resources
MCP Server resources can be conveniently included in a message with:
description = await agent.with_resource(
"What is in this image?",
"resource://images/cat.png",
"mcp_image_server",
)
Prompt Files
Prompt Files can include Resources:
---USER
Please extract the major colours from this CSS file:
---RESOURCE
index.css
They can be loaded with fast_agent.load_prompt, or exposed by an external MCP prompt server.
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.
- yesterday First seen · 48 lines · 0 tokens per session scan A f0cf5de9e8b8
index is an agent published in the GitHub repository evalstate/fast-agent (3,904 stars, last pushed 2d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 243 tokens. 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 2026-08-30.
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