echo-test

echo-test is a skill for Claude Code, Codex from rp1-run/rp1. It costs 18 tokens per session (654 once invoked), scanned A, original, Apache-2.0.

A test skill that checks whether a coding assistant can pass parameters, run shell commands, read and write files, and report results in Copilot CLI.

In plain words
What is it for?
Use it to test slash-command inputs, Bash execution, file-system access, and plain or JSON output.
Why use it?
It helps verify that the assistant’s basic skill and command-line connections work as expected.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

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 skills/rp1-run/rp1/echo-test
Any agent
npx skills add rp1-run/rp1 --skill echo-test
Clone the repo
git clone --depth 1 https://github.com/rp1-run/rp1

Made for: Claude Code, Codex.

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-test

README.md
[![agentmods](https://agentmods.dev/badge/skills/rp1-run/rp1/echo-test.svg)](https://agentmods.dev/skills/rp1-run/rp1/echo-test)
Your own site
<a href="https://agentmods.dev/skills/rp1-run/rp1/echo-test"><img src="https://agentmods.dev/badge/skills/rp1-run/rp1/echo-test.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 654 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 $0.00018 $0.00654
Opus 5 $0.00009 $0.00327
Sonnet 5 $0.00004 $0.00131
Haiku 4.5 $0.00002 $0.00065

Measured 6d ago against content hash dd6c603eecf1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

echo-test 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.

fixtures/copilot-validation/.github/skills/echo-test/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Echo Test Skill

You are a validation skill for testing Copilot CLI harness primitives. Execute each step below and report results.

Parameters

This skill accepts two parameters from the user's invocation text:

  • MESSAGE: The message to echo back (required)
  • FORMAT: Output format -- "plain" or "json" (optional, defaults to "plain")

Parse these from the user's slash command invocation. For example:

  • /echo-test "hello world" -> MESSAGE="hello world", FORMAT="plain"
  • /echo-test "hello world" json -> MESSAGE="hello world", FORMAT="json"

If MESSAGE is missing, respond with: [FIXTURE] Error: MESSAGE parameter is required. Usage: /echo-test <message> [format]

Step 1: Parameter Echo

Report the parsed parameters:

[FIXTURE] Parameters received:
  MESSAGE: <parsed message>
  FORMAT: <parsed format>

Step 2: Shell Execution

Run the following shell command to verify Bash tool access:

echo "[FIXTURE] Shell execution working -- $(date -u +%Y-%m-%dT%H:%M:%SZ)"

Report the output.

Step 3: File System Operations

  1. Read: Read the file .rp1/context/index.md and confirm it contains "Copilot Validation Fixture"
  2. Write: Write the following content to .rp1/work/echo-test-output.md:
# Echo Test Output

- Message: <MESSAGE>
- Format: <FORMAT>
- Timestamp: <current UTC time>
- Status: PASS
  1. Search: Use file search to find all .md files in .rp1/context/
  2. Edit: Append a line to .rp1/work/echo-test-output.md with - Verified: true

Report each operation as PASS or FAIL.

Step 4: rp1 Agent Tools

Run the following command to verify rp1 CLI integration:

rp1 agent-tools rp1-root-dir

Report whether the command executes successfully and returns valid JSON.

Step 5: Summary

Output a summary in the requested FORMAT:

Plain format:

[FIXTURE] Echo Test Complete
  Parameters: PASS/FAIL
  Shell: PASS/FAIL
  File Read: PASS/FAIL
  File Write: PASS/FAIL
  File Search: PASS/FAIL
  File Edit: PASS/FAIL
  Agent Tools: PASS/FAIL

Read the full file on GitHub · 103 lines

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 · 103 lines · 18 tokens per session scan A dd6c603eecf1

Subscribe to this mod's changes

echo-test is a skill published in the GitHub repository rp1-run/rp1 (38 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 18 tokens to every session and 654 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 2026-08-30.

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