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.
npx agentmods add skills/softaworks/agent-toolkit/openapi-to-typescriptnpx skills add softaworks/agent-toolkit --skill openapi-to-typescriptgit clone --depth 1 https://github.com/softaworks/agent-toolkitWhat 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 | $0.00060 | $0.01943 |
| Opus 5 | $0.00030 | $0.00971 |
| Sonnet 5 | $0.00012 | $0.00389 |
| Haiku 4.5 | $0.00006 | $0.00194 |
Grade A, and why
openapi-to-typescript 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.
How it starts
The opening of the file, as written. The whole thing — 345 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenAPI to TypeScript
Converts OpenAPI 3.0 specifications to TypeScript interfaces and type guards.
Input: OpenAPI file (JSON or YAML) Output: TypeScript file with interfaces and type guards
When to Use
- "generate types from openapi"
- "convert openapi to typescript"
- "create API interfaces"
- "generate types from spec"
Workflow
- Request the OpenAPI file path (if not provided)
- Read and validate the file (must be OpenAPI 3.0.x)
- Extract schemas from
components/schemas - Extract endpoints from
paths(request/response types) - Generate TypeScript (interfaces + type guards)
- Ask where to save (default:
types/api.tsin current directory) - Write the file
OpenAPI Validation
Check before processing:
- Field "openapi" must exist and start with "3.0"
- Field "paths" must exist
- Field "components.schemas" must exist (if there are types)
If invalid, report the error and stop.
Type Mapping
Primitives
| OpenAPI | TypeScript |
|---|---|
string |
string |
number |
number |
integer |
number |
boolean |
boolean |
null |
null |
Format Modifiers
| Format | TypeScript |
|---|---|
uuid |
string (comment UUID) |
date |
string (comment date) |
date-time |
string (comment ISO) |
email |
string (comment email) |
uri |
string (comment URI) |
Complex Types
Object:
// OpenAPI: type: object, properties: {id, name}, required: [id]
interface Example {
id: string; // required: no ?
name?: string; // optional: with ?
}
Array:
// OpenAPI: type: array, items: {type: string}
type Names = string[];
Enum:
// OpenAPI: type: string, enum: [active, draft]
type Status = "active" | "draft";
oneOf (Union):
// OpenAPI: oneOf: [{$ref: Cat}, {$ref: Dog}]
type Pet = Cat | Dog;
What ships with it
1 file 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.
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 · 345 lines · 60 tokens per session scan A a27383fcaea8
openapi-to-typescript is a skill published in the GitHub repository softaworks/agent-toolkit (2,413 stars, last pushed 6mo ago), licensed MIT. It adds 60 tokens to every session and 1,943 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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