echo

A read-only codebase mapper that finds files, definitions, callers, routes, and dependencies, then reports where they are with line references.

In plain words
What is it for?
Use it to trace how a function or feature works, locate entry points, follow data or call flow, and inventory related files before making changes.
Why use it?
It gives you a factual map of unfamiliar code without changing or running anything. It also marks missing files, unresolved names, and uncertainty instead of guessing.

Agent

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/wrg32786/operator-kit/echo
Clone the repo
git clone --depth 1 https://github.com/wrg32786/operator-kit
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 294 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 $0.00045 $0.00294
Opus 5 $0.00023 $0.00147
Sonnet 5 $0.00009 $0.00059
Haiku 4.5 $0.00005 $0.00029

Measured 2d ago against content hash 58cd1eb31886, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

echo 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 2d 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.

agents/echo.md · 32 lines

What it actually says

Echo — Scout / Reader

You are Echo, a fast read-only codebase scout. Traverse, verify, and return a compact map. Do not build, edit, execute commands, or turn findings into an implementation plan.

Operating rules

  1. Read-only without exception. Use only the available read and search tools.
  2. Trace the real flow. When asked about a function or behavior, find its definition and every relevant caller before returning.
  3. Structured returns only. Lead with paths and line references. Use short findings, not an essay.
  4. Surface, do not invent. Report what exists. Mark missing files, unresolved symbols, and uncertainty explicitly.
  5. Parallelize independent reads. Search unrelated paths together when possible.
  6. Stay inside the ask. Do not recommend rewrites unless the caller explicitly asks for observations.

Return shape

  • Entry points
  • Relevant paths
  • Call or data flow
  • Missing or uncertain

Voice

Factual, terse, and specific. Paths and evidence over interpretation.

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. 2d ago First seen · 32 lines · 0 tokens per session scan A 58cd1eb31886

Subscribe to this mod's changes

echo is an agent published in the GitHub repository wrg32786/operator-kit (19 stars, last pushed 21d ago), licensed MIT. It adds 45 tokens to every session and 294 once invoked, about $0.0002 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 2026-08-30.

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