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 skills add batteryshark/rekit --skill frida-api-tracegit clone --depth 1 https://github.com/batteryshark/rekitWrote 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/batteryshark/rekit/frida-api-trace)<a href="https://agentmods.dev/skills/batteryshark/rekit/frida-api-trace"><img src="https://agentmods.dev/badge/skills/batteryshark/rekit/frida-api-trace/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.
<a href="https://agentmods.dev/skills/batteryshark/rekit/frida-api-trace"><img src="https://agentmods.dev/badge/skills/batteryshark/rekit/frida-api-trace.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00085 | $0.00540 |
| Opus 5.5 | $0.00034 | $0.00216 |
| Sonnet 5.5 | $0.00017 | $0.00108 |
| Haiku 4.5 | $0.00009 | $0.00054 |
Grade A, and why
frida-api-trace 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 1mo 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.
What it actually says
Signature-Aware Frida API Trace
Trace a bounded set of exported APIs while preserving their parameter names and
types. This complements frida-trace: use frida-trace for quick glob-based call
counts, and this skill when API signatures make the captured events materially more
readable.
Safety and data boundary
This skill spawns and executes the target. Use an isolated, authorized analysis
environment and invoke it through rekit run --allow-dynamic.
API Monitor's XML definitions are user-supplied data with their own license. Rekit
does not redistribute them. Put your legally obtained tree at
skills/frida-api-trace/assets/apimonitor/ (ignored by Git), or pass another location
with --definitions.
Usage
rekit run --allow-dynamic frida-api-trace ./sample.exe \
--apis "CreateFileW,WriteFile,RegSetValueExW,WinHttpSendRequest" \
--format json
rekit run --allow-dynamic frida-api-trace ./sample.exe \
--definitions /path/to/api-monitor-xml \
--modules "Kernel32.dll,Advapi32.dll" \
--apis "CreateProcess*,VirtualAlloc*,WriteProcessMemory"
The XML parser expands BothCharset="True" declarations into A and W exports,
prefers the richest duplicate signature, and caps wildcard expansion with
--max-hooks. The generated Frida script reads only bounded ANSI/UTF-16 string
arguments it can identify safely; other arguments remain pointer/scalar values.
The target is terminated after --timeout seconds if it has not already exited.
JSON reports selected signatures, installed/missing hooks, captured calls, truncation,
and XML parse warnings. A missing export remains visible instead of silently reducing
coverage.
Prerequisites
- Python 3.8+
frida-tools/ Pythonfridabindings- A local API Monitor XML definition tree that you are permitted to use
Direct invocation additionally requires --yes-i-consent or
REKIT_ALLOW_DYNAMIC=1.
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.
- 1mo ago First seen · 54 lines · 85 tokens per session scan A 94a980ab326d
frida-api-trace is a skill published in the GitHub repository batteryshark/rekit (20 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 85 tokens to every session and 540 once invoked, about $0.0003 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 2026-08-30.
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