Voiden is an offline API workspace that stores requests, tests, documentation, and reusable API components in plain-text Markdown-based files managed with Git. Developers, QA engineers, and technical writers use it to build, test, document, script, and collaborate on APIs.
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/voidenhq/voiden/basenpx skills add VoidenHQ/voiden --skill basegit clone --depth 1 https://github.com/VoidenHQ/voidenWrote 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.
[](https://agentmods.dev/skills/voidenhq/voiden/base)<a href="https://agentmods.dev/skills/voidenhq/voiden/base"><img src="https://agentmods.dev/badge/skills/voidenhq/voiden/base.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00028 | $0.04403 |
| Opus 5 | $0.00014 | $0.02201 |
| Sonnet 5 | $0.00006 | $0.00881 |
| Haiku 4.5 | $0.00003 | $0.00440 |
Grade A, and why
voiden scanned grade A with 1 finding 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 yesterday.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
### Convert curl to .void How it starts
The opening of the file, as written. The whole thing — 446 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Voiden .void File Format
Overview
Voiden uses .void files for API testing. Each file uses a hybrid format combining:
- YAML frontmatter for metadata
- Markdown content for documentation
- Custom
voidcode blocks for structured request/response data
File Structure
---
version: 0.20.1
generatedBy: Voiden app
note: This file is auto-generated by the Voiden app
generatedAt: 2025-01-15T10:30:00.000Z
---
# API Documentation Title
Description and test cases in Markdown...
```void
---
type: request
attrs:
uid: 05119029-b827-45fe-a2cc-55a5f0ba6609
content:
- type: method
attrs:
uid: 35d05fd6-1e12-4f6a-97d5-5c66d59bc61f
method: GET
visible: true
content: GET
- type: url
attrs:
uid: f84b83da-7fe7-415f-baa1-b045adfd7438
content: https://api.example.com/users
---
## Frontmatter Fields
| Field | Value |
|-------|-------|
| `version` | Current Voiden version (e.g. `0.20.1`) |
| `generatedBy` | Always `"Voiden app"` |
| `note` | Always `"This file is auto-generated by the Voiden app"` |
| `generatedAt` | ISO 8601 timestamp |
## Void Block Structure
All blocks use triple-backtick `void` fences:
```yaml
---
type: [block-type]
attrs:
uid: [UUID v4]
[other-attrs...]
content:
[child nodes or string value]
---
Rules
- UIDs: Always UUID v4 —
crypto.randomUUID()oruuidgen - Variables: Use
{{VARIABLE_NAME}}for environment variables - Indentation: 2 spaces for YAML and JSON
- Strings: Quote values containing special characters, colons, or spaces
- Timestamps: ISO 8601 format (
2025-01-15T10:30:00.000Z) - Block order inside
request: method → url → auth → headers-table → query-table → path-table → body → assertions → scripts
Workflows
Convert curl to .void
- Parse HTTP method from
-Xflag (default GET) - Extract URL (from
--url, bare argument) - Map
-H "Key: Value"→headers-tablerows - Map
?key=valuequery params in URL →query-tablerows - Map
-d '{...}'→json_body(ortext_bodyfor non-JSON) - Map
-u user:pass→authblock withauthType: basic - Map
-H "Authorization: Bearer ..."→authblock withauthType: bearer - Generate fresh UUIDs for all
uidattrs - Write ISO timestamp for
generatedAt
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.
- yesterday First seen · 446 lines · 28 tokens per session scan A b46d55a63126
voiden is a skill published in the GitHub repository VoidenHQ/voiden (1,661 stars, last pushed today), licensed Apache-2.0. It adds 28 tokens to every session and 4,403 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
ast-introspection
Use Go AST-aware analysis to enumerate symbols, extract signatures, and propose mechanically safe refactors (read-only by default).
ci-orchestrator
Run a CI-like pipeline locally (format, lint, vet, static-analysis, tests) and summarize per-step results with remediation guidance.
config-loader-helper
Diagnose configuration-related failures, enumerate required env vars, and guide safe local test setup (no secrets).
db-infra-mocks
Propose minimal seams and local substitutes so tests run without real RDBMS/Redis/Mongo infrastructure.
build-run
Build and run the project locally to reproduce compile/runtime issues in a safe, non-production way.
code-navigation
Rapid, focused navigation to locate definitions/usages and map the impact of proposed changes.