A collection of common developer utilities for dates, hashes, UUIDs, encoding, passwords, regular expressions, and AES encryption. A UUID is a unique identifier, and a regular expression is a pattern used to validate or find text.

Use it to convert or parse times, calculate hashes, create UUIDs and passwords, encode or decode text, test regular expressions, or encrypt and decrypt with AES.

It puts small data-processing tasks in one place instead of requiring separate commands or scripts. It can save time when converting values, checking text, or creating test data.

devtool — Skill by fisker086

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/fisker086/aiops/devtool

Any agent

npx skills add fisker086/AIOps --skill devtool

Clone the repo

git clone --depth 1 https://github.com/fisker086/AIOps

Made for: Claude Code, Codex.

Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 453 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.

Model	Per session	Once invoked
Fable 5	$0.00022	$0.00453
Opus 5	$0.00011	$0.00227
Sonnet 5	$0.00004	$0.00091
Haiku 4.5	$0.00002	$0.00045

Measured 2d ago against content hash e8353c44275c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

devtool 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.

skills/devtool/SKILL.md · 61 lines

What it actually says

DevTool Skill

All-in-one development utilities tool. Use builtin_devtool tool with the following operations:

Operations

1. datetime

now: Get current time in various formats
convert: Convert time between timezones
parse: Parse a timestamp string
relative: Calculate relative time

2. hash

Calculate hash values:

sha1, sha256, sha512
bcrypt: Hash password with bcrypt

3. uuid

Generate UUIDs:

v4: Random UUID v4

4. encode/decode

base64_encode, base64_decode
base58_encode, base58_decode
url_encode, url_decode
hex_encode, hex_decode

5. password

Generate secure passwords. Parameters:

length: Password length (default 16)
use_uppercase: Include uppercase letters (default true)
use_lowercase: Include lowercase letters (default true)
use_numbers: Include numbers (default true)
use_special: Include special chars (default true)

6. regex

validate: Validate string against regex pattern
match: Find matches in text

7. aes

aes_encrypt: AES encryption
aes_decrypt: AES decryption

Parameters

operation: The operation to perform
input: Input string (for hash, encode, decode, regex)
param: Additional parameter (timezone, length, etc.)
length: Password length
use_uppercase: Include uppercase (true/false)
use_lowercase: Include lowercase (true/false)
use_numbers: Include numbers (true/false)
use_special: Include special chars (true/false)

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.

2d ago First seen · 61 lines · 22 tokens per session scan A e8353c44275c

Subscribe to this mod's changes

devtool is a skill published in the GitHub repository fisker086/AIOps (21 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 22 tokens to every session and 453 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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