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/nvidia/skillevaluator/api-callernpx skills add NVIDIA/SkillEvaluator --skill api-callergit clone --depth 1 https://github.com/NVIDIA/SkillEvaluatorWrote 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/nvidia/skillevaluator/api-caller)<a href="https://agentmods.dev/skills/nvidia/skillevaluator/api-caller"><img src="https://agentmods.dev/badge/skills/nvidia/skillevaluator/api-caller.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 | $0.00029 | $0.01062 |
| Opus 5 | $0.00015 | $0.00531 |
| Sonnet 5 | $0.00006 | $0.00212 |
| Haiku 4.5 | $0.00003 | $0.00106 |
Grade A, and why
api-caller 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 4d 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 — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Caller Skill
Generic skill to call any REST API dynamically. Can work with OpenAPI specs or direct endpoint calls.
Capabilities
- Call any REST API endpoint (GET, POST, PUT, DELETE)
- Parse OpenAPI/Swagger specs to discover endpoints
- Handle common authentication (API keys, Bearer tokens)
- JSON request/response handling
Instructions
- Read this SKILL.md to choose the direct-call or OpenAPI workflow.
- Use
scripts/parse_openapi.pyfirst when the user gives an OpenAPI or Swagger spec. - Use
scripts/call_api.pyfor the actual HTTP request. - Return the request result and any recoverable error details to the user.
Scripts
scripts/parse_openapi.py
Use this first when given an API spec URL. Parses an OpenAPI/Swagger spec and returns available operations with parameters. Run commands from the skill base directory; script paths are relative to this SKILL.md file.
Usage:
python scripts/parse_openapi.py <spec_url> [filter_path]
Arguments:
<spec_url>- URL to the OpenAPI spec (required)[filter_path]- Optional: filter operations by path substring
Example:
python scripts/parse_openapi.py "https://api.example.com/openapi.json"
Returns: API name, base URL, and list of operations with their parameters, request body schema, etc.
scripts/call_api.py
Call a REST API endpoint directly or using an OpenAPI spec. Run commands from the skill base directory; script paths are relative to this SKILL.md file.
Usage:
python scripts/call_api.py --url <endpoint_url> [options]
Arguments:
--url <endpoint_url>- Direct API endpoint URL (required if no --spec)--method <GET|POST|PUT|DELETE>- HTTP method (default: GET)--data <json_string>- Request body as JSON string--headers <json_string>- Custom headers as JSON string--spec <openapi_url>- OpenAPI spec URL (optional, for discovery)--operation <operation_id>- Operation ID from OpenAPI spec--params <json_string>- Path/query parameters as JSON
What ships with it
4 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.
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.
- 4d ago First seen · 136 lines · 29 tokens per session scan A d6d3cdb62214
api-caller is a skill published in the GitHub repository NVIDIA/SkillEvaluator (399 stars, last pushed today), licensed Apache-2.0. It adds 29 tokens to every session and 1,062 once invoked, about $0.0001 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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