What is echo3s-mcp CLAUDE.md?

A project instruction file for the Echo3s MCP repository. MCP is a way for an agent to connect to external tools, and the file explains this server’s structure and key source files.

Use it when working on Echo3s-io/echo3s-mcp, especially around content.ts, index.ts, or the server’s standard-input interface.

It gives the coding agent repository-specific context about the server, its architecture, and how its shared and command-line files fit together.

How Echo3s-io/echo3s-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Echo3s-io/echo3s-mcp. 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/Echo3s-io/echo3s-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Echo3s-io/echo3s-mcp

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/echo3s-io/echo3s-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/echo3s-io/echo3s-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/echo3s-io/echo3s-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/echo3s-io/echo3s-mcp/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/echo3s-io/echo3s-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/echo3s-io/echo3s-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,116 This file is loaded in full into every session.

When invoked 1,116 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.01116	$0.01116
Opus 5.5	$0.00446	$0.00446
Sonnet 5.5	$0.00223	$0.00223
Haiku 4.5	$0.00112	$0.00112

Measured 2mo ago against content hash 3f63b34c0869, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

echo3s-mcp CLAUDE.md 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.md · 98 lines

The source is not reproduced here

No licence file

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.

2mo ago First seen · 98 lines · 1,116 tokens per session scan A 3f63b34c0869

Subscribe to this mod's changes

echo3s-mcp CLAUDE.md is an instructions file published in the GitHub repository Echo3s-io/echo3s-mcp (0 stars, last pushed 7mo ago), with no licence file. It adds 1,116 tokens to every session, about $0.0045 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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echo3s-mcp: Instructions file for Claude Code