generate-api-client

Instructions and commands for regenerating a frontend TypeScript API client from a backend OpenAPI description. OpenAPI is a machine-readable document describing an application’s API endpoints and data types.

In plain words
What is it for?
Use them after changing backend API signatures or related types, then regenerate the client and run the specified lint and frontend tests.
Why use it?
They prevent generated client files from drifting away from changed Java controllers and stop developers from hand-editing files that should be regenerated.

Skill for Claude CodeCodex

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/nerds-odd-e/doughnut/generate-api-client
Any agent
npx skills add nerds-odd-e/doughnut --skill generate-api-client
Clone the repo
git clone --depth 1 https://github.com/nerds-odd-e/doughnut

Made for: Claude Code, Codex.

Per session 53 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. 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 $0.00053 $0.00700
Opus 5 $0.00026 $0.00350
Sonnet 5 $0.00011 $0.00140
Haiku 4.5 $0.00005 $0.00070

Measured 2d ago against content hash 2e92fbd65746, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

generate-api-client 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.

.agents/skills/generate-api-client/SKILL.md · 96 lines

What it actually says

Purpose: Keep packages/generated/donut-backend-api in sync with Java controllers — never hand-edit generated output.

Output: Regenerated client + green frontend tests + summary ending with ## API CLIENT GENERATED.

Never edit generated code directly. This includes whitespace-only cleanup in sdk.gen.ts, types.gen.ts, and open_api_docs.yaml; if generated output changes, accept it or fix the generator path.

Git does not use the Nix prefix. All other repo tooling does: CURSOR_DEV=true nix develop -c …

Do not run raw git diff --check as a generated-client cleanup gate. Use scripts/check_diff_whitespace.sh, which excludes generated API artifacts from manual whitespace fixes.

Regenerate when:

  • A backend controller signature changed
  • A backend data type used by any controller signature changed
  • pnpm openapi:lint or pnpm format:all fails with OpenAPI validation errors
CURSOR_DEV=true nix develop -c pnpm frontend:test

Fix any broken frontend code that used the old API signatures.

<success_criteria>

  • Java controllers fixed at source (not generated files)
  • pnpm generateTypeScript run with Nix prefix
  • Frontend tests pass after signature changes
  • OpenAPI lint passes (fix controllers + regenerate, never hand-edit YAML)
  • Final output includes ## API CLIENT GENERATED </success_criteria>
  1. What triggered regeneration (controller/DTO change, lint failure, etc.).
  2. Whether frontend call sites needed updates.
  3. Tests run and confirmed passing.
## API CLIENT GENERATED

<out_of_scope>

  • Do not hand-edit sdk.gen.ts, types.gen.ts, or open_api_docs.yaml.
  • Do not use raw git diff --check for generated-client whitespace gates. </out_of_scope>
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. 2d ago First seen · 96 lines · 53 tokens per session scan A 2e92fbd65746

Subscribe to this mod's changes

generate-api-client is a skill published in the GitHub repository nerds-odd-e/doughnut (49 stars, last pushed 2d ago), licensed MIT. It adds 53 tokens to every session and 700 once invoked, about $0.0003 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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