echo-writer

echo-writer is an agent for Claude Code from gustavo-meilus/superpipelines. It costs 29 tokens per session (287 once invoked), scanned A, original, MIT.

A tracing step that writes a known sentinel string to a run directory. The sentinel acts as proof that a data-only pipeline dispatch reached this step.

In plain words
What is it for?
Use it as the first tracer step before a read-only checker reviews the resulting output.
Why use it?
It makes it possible to check whether the pipeline executed the expected path.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents.

Part of the superpipelines plugin — 54 skills, 10 commands, 23 agents, 4 hooks shipped together

Install

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.

agentmods
npx agentmods add agents/gustavo-meilus/superpipelines/echo-writer
Clone the repo
git clone --depth 1 https://github.com/gustavo-meilus/superpipelines

Made for: Claude Code.

Or install superpipelines, the plugin that ships this one along with the rest of its 54 skills, 10 commands, 23 agents, 4 hooks.

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 echo-writer

README.md
[![agentmods](https://agentmods.dev/badge/agents/gustavo-meilus/superpipelines/echo-writer.svg)](https://agentmods.dev/agents/gustavo-meilus/superpipelines/echo-writer)
Your own site
<a href="https://agentmods.dev/agents/gustavo-meilus/superpipelines/echo-writer"><img src="https://agentmods.dev/badge/agents/gustavo-meilus/superpipelines/echo-writer.svg" alt="Measured on agentmods" height="20"></a>
Per session 29 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 287 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00029 $0.00287
Opus 5 $0.00015 $0.00143
Sonnet 5 $0.00006 $0.00057
Haiku 4.5 $0.00003 $0.00029

Measured 6d ago against content hash 6c4d0932f81d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

echo-writer 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 6d 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.

.superpipelines/pipelines/tracer-echo/agents/echo-writer.md · 44 lines

What it actually says

Echo Writer — Tracer Step 1

Protocol

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. 6d ago First seen · 44 lines · 29 tokens per session scan A 6c4d0932f81d

Subscribe to this mod's changes

echo-writer is an agent published in the GitHub repository gustavo-meilus/superpipelines (4 stars, last pushed 1mo ago), licensed MIT. It adds 29 tokens to every session and 287 once invoked, about $0.0001 per session on Opus 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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