incremental-python-programmer

incremental-python-programmer is a skill for Claude Code, Codex from ArabelaTso/Skills-4-SE. It costs 110 tokens per session (3,123 once invoked), scanned A, original, Apache-2.0.

A coding workflow for adding features to existing Python projects from plain-language descriptions. It places the code in the repository, adds tests, and checks that the tests pass.

In plain words
What is it for?
Use it to implement requested Python functions, classes, modules, or modifications with automated testing and validation.
Why use it?
It reduces the effort of understanding an unfamiliar Python codebase and deciding how a new change should fit its existing structure and conventions.

Skill for Claude CodeCodex

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

Good fit Use it to implement requested Python functions, classes, modules, or modifications with automated testing and validation.

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Install with agentmods
npx agentmods add skills/arabelatso/skills-4-se/incremental-python-programmer
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 ArabelaTso/Skills-4-SE --skill incremental-python-programmer
Clone the repo
git clone --depth 1 https://github.com/ArabelaTso/Skills-4-SE

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 incremental-python-programmer

README.md
[![agentmods](https://agentmods.dev/badge/skills/arabelatso/skills-4-se/incremental-python-programmer.svg)](https://agentmods.dev/skills/arabelatso/skills-4-se/incremental-python-programmer)
Your own site
<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/incremental-python-programmer"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/incremental-python-programmer.svg" alt="Measured on agentmods" height="20"></a>
Per session 110 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,123 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 $0.00110 $0.03123
Opus 5 $0.00055 $0.01562
Sonnet 5 $0.00022 $0.00625
Haiku 4.5 $0.00011 $0.00312

Measured 3d ago against content hash 0f0dd6fd7c3f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

incremental-python-programmer 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 3d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/analyze_repo_structure.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/incremental-python-programmer/SKILL.md · 547 lines

How it starts

The opening of the file, as written. The whole thing — 547 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Incremental Python Programmer

Implement new features in Python repositories with automated testing and validation.

Workflow

1. Understand the Feature Request

Parse the request:

  • Identify what functionality is being requested
  • Determine scope (function, class, module, or modification)
  • Understand expected behavior and inputs/outputs
  • Note any specific requirements or constraints

Clarify if needed:

  • Ask about edge cases
  • Confirm integration points
  • Verify expected behavior
  • Check for dependencies

2. Analyze Repository Structure

Automated analysis:

python scripts/analyze_repo_structure.py <repo_path>

Manual analysis:

  • Identify relevant modules and files
  • Understand existing code organization
  • Find similar existing implementations
  • Locate test directory structure
  • Check coding conventions and patterns

Key questions:

  • Where should the new code be placed?
  • What existing code needs modification?
  • What dependencies are needed?
  • What patterns should be followed?

See implementation-patterns.md for common patterns.

3. Plan Implementation

Determine implementation approach:

For new functions:

  • Identify appropriate module
  • Determine function signature
  • Plan implementation logic
  • Identify dependencies

For new classes:

  • Identify appropriate module or create new one
  • Design class structure and methods
  • Plan initialization and attributes
  • Consider inheritance if applicable

For new modules:

  • Determine module name and location
  • Plan module structure
  • Identify exports and public API
  • Plan integration with existing code

For modifications:

  • Identify code to modify
  • Plan backward compatibility
  • Determine parameter additions
  • Plan integration with existing logic

4. Implement the Feature

Follow this order:

Step 1: Add necessary imports

# Standard library
import os
from typing import List, Dict, Optional

# Third-party (add to requirements.txt if new)
import requests

# Local imports
from .existing_module import helper_function

Read the full file on GitHub · 547 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 547 lines · 110 tokens per session scan A 0f0dd6fd7c3f

Subscribe to this mod's changes

incremental-python-programmer is a skill published in the GitHub repository ArabelaTso/Skills-4-SE (248 stars, last pushed 17d ago), licensed Apache-2.0. It adds 110 tokens to every session and 3,123 once invoked, about $0.0006 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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