skill-139

skill-139 is a skill for Claude Code, Codex from legendtkl/agentic-skill-router. It costs 30 tokens per session (700 once invoked), scanned A, original, MIT.

A collection of numerical computing methods designed to work with JAX arrays, including mathematical operations and ordinary differential equation solvers. JAX is a Python library for fast array-based calculations.

In plain words
What is it for?
Use it for scientific calculations, array operations, mathematical functions, and solving ordinary differential equations.
Why use it?
It gives you ready-to-use patterns for common numerical tasks while keeping calculations compatible with JAX. This reduces the need to implement and check each method yourself.

Skill for Claude CodeCodex

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

Good fit Use it for scientific calculations, array operations, mathematical functions, and solving ordinary differential equations.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/legendtkl/agentic-skill-router/skill-139
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.

Any agent
npx skills add legendtkl/agentic-skill-router --skill skill-139
Clone the repo
git clone --depth 1 https://github.com/legendtkl/agentic-skill-router

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 skill-139

README.md
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Your own site
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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.

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Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 700 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00030 $0.00700
Opus 5 $0.00015 $0.00350
Sonnet 5 $0.00006 $0.00140
Haiku 4.5 $0.00003 $0.00070

Measured 7d ago against content hash 3fab06d53117, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

skill-139 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 7d 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.

experiments/dci-compare/skillrouter-skills/skill-139/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Requirements for Outputs

General Guidelines

Numerical Methods

  • All numerical methods should be compatible with JAX arrays.
  • Ensure that methods are efficient and maintain numerical accuracy.

JAX General Numerical Computing

1. Basic Operations

add(a, b)

Description: Perform element-wise addition of two arrays.
Parameters:

  • a (array): First input array.
  • b (array): Second input array.

Returns: Array resulting from element-wise addition.

import jax.numpy as jnp
import jax_general_numerical_computing as jx

a = jnp.array([1, 2, 3])
b = jnp.array([4, 5, 6])
result = jx.add(a, b)

2. Advanced Mathematical Functions

sin(x)

Description: Compute the sine of an array of values.
Parameters:

  • x (array): Input array.

Returns: Array of sine values corresponding to the input array.

x = jnp.array([0, jnp.pi/2, jnp.pi])
sine_values = jx.sin(x)

3. Differential Equations

solve_ode(ode_func, y0, t)

Description: Solve ordinary differential equations using a given function and initial conditions.
Parameters:

  • ode_func (callable): Function representing the ODE.
  • y0 (array): Initial conditions.
  • t (array): Time points for solution.

Returns: Solution to the ODE at the specified time points.

from jax import scipy
def ode_func(t, y):
    return -0.5 * y

solution = jx.solve_ode(ode_func, jnp.array([1.0]), jnp.array([0, 1, 2]))

4. Statistical Functions

mean(array)

Description: Calculate the mean of an array.
Parameters:

  • array (array): Input array.

Returns: Mean value of the input array.

array = jnp.array([1, 2, 3, 4, 5])
mean_value = jx.mean(array)

5. Matrix Operations

matrix_multiply(a, b)

Description: Multiply two matrices using JAX.
Parameters:

  • a (array): First matrix.
  • b (array): Second matrix.

Returns: Resulting matrix from multiplication.

Read the full file on GitHub · 101 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. 7d ago First seen · 101 lines · 30 tokens per session scan A 3fab06d53117

Subscribe to this mod's changes

skill-139 is a skill published in the GitHub repository legendtkl/agentic-skill-router (5 stars, last pushed 3mo ago), licensed MIT. It adds 30 tokens to every session and 700 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 2026-09-03.

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