repoforge: Skill for Claude Code

.claude/skills/frontend/api/SKILL.md

add-api-endpoint is a skill for Claude Code from JNZader/repoforge. It costs 31 tokens per session (517 once invoked), scanned A, original, MIT.

A frontend guide for retrieving data from an API and starting a data-generation process, including handling API errors and receiving real-time updates.

In plain words
What is it for?
Use it when a frontend feature needs to fetch API results, handle an ApiError, start generation, or monitor generation progress.
Why use it?
It provides consistent patterns for connecting the interface to server data and for reporting failures during those requests.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is JNZader/repoforge's own configuration. It tells Claude Code how to work on repoforge itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything repoforge configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python repoforge/cli.py dev.

Reuse

Borrowing it

Nothing to install: this file belongs to JNZader/repoforge. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/JNZader/repoforge/main/.claude/skills/frontend/api/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/JNZader/repoforge

Made for: Claude Code.

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 add-api-endpoint

README.md
[![agentmods](https://agentmods.dev/badge/skills/jnzader/repoforge/api/github.svg)](https://agentmods.dev/skills/jnzader/repoforge/api)
Your own site
<a href="https://agentmods.dev/skills/jnzader/repoforge/api"><img src="https://agentmods.dev/badge/skills/jnzader/repoforge/api/github.svg" alt="Measured on agentmods" height="20"></a>

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.

agentmods 80×15 button for add-api-endpoint

Your own site · 80×15
<a href="https://agentmods.dev/skills/jnzader/repoforge/api"><img src="https://agentmods.dev/badge/skills/jnzader/repoforge/api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 517 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 $0.00031 $0.00517
Opus 5.5 $0.00012 $0.00207
Sonnet 5.5 $0.00006 $0.00103
Haiku 4.5 $0.00003 $0.00052

Measured 24d ago against content hash 667483b1d922, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-api-endpoint 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 24d 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.

.claude/skills/frontend/api/SKILL.md · 92 lines

What it actually says

add-api-endpoint

One sentence: Centralized API client for the web frontend with React Query integration.

Trigger: when fetching or mutating data from the backend API.

Quick Reference

Task Pattern
Fetch generations useGenerations()
Start generation useStartGeneration()

Critical Patterns (Summary)

Error Handling with ApiError

Handle structured API errors using the ApiError class which provides status and code fields for precise error categorization.

import { ApiError } from '@/lib/api';

try {
  const data = await fetchApi<User>('/api/user');
} catch (error) {
  if (error instanceof ApiError) {
    // Handle specific status codes
    if (error.status === 401) {
      // Redirect to login
    }
  }
}

useStartGeneration Mutation

Use the useStartGeneration mutation to trigger generation workflows with automatic query invalidation.

import { useStartGeneration } from '@/lib/api';

const { mutate, isLoading } = useStartGeneration();
mutate({ mode: 'docs' });

When to Use

  • Fetching generation data or provider lists from the backend
  • Starting new generation workflows with proper mutation handling
  • Canceling in-progress generation tasks
  • Querying analytics and provider information

Commands

docker compose -f docker-compose.dev.yml up -d
python repoforge/cli.py dev

Anti-Patterns

Don't: Ignore ApiError status codes

Accessing error.message without checking error.status or error.code leads to brittle error handling that breaks on different error types.

// BAD - assumes all errors are generic
catch (error) {
  console.error(error.message); // Misses status/code context
}
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. 24d ago Changed · -16 lines · +4 tokens per session 667483b1d922
  2. 25d ago Changed · +9 lines · +1 tokens per session 7b5664d89412
  3. 1mo ago First seen · 99 lines · 26 tokens per session scan A eee775af3547

Subscribe to this mod's changes

add-api-endpoint is a skill published in the GitHub repository JNZader/repoforge (5 stars, last pushed 24d ago), licensed MIT. It adds 31 tokens to every session and 517 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

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