Claude Code Skills Marketplace is a collection and marketplace of skills, plugins, agents, and instructions that extend Claude Code with specialized development workflows. It is for developers who want to install existing workflows or create, validate, and package their own Claude Code skills.
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/daymade/claude-code-skills/stepfun-asrnpx skills add daymade/claude-code-skills --skill stepfun-asrgit clone --depth 1 https://github.com/daymade/claude-code-skillsWrote 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/daymade/claude-code-skills/stepfun-asr)<a href="https://agentmods.dev/skills/daymade/claude-code-skills/stepfun-asr"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/stepfun-asr.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 5.1 | $0.00209 | $0.02296 |
| Opus 5 | $0.00105 | $0.01148 |
| Sonnet 5 | $0.00042 | $0.00459 |
| Haiku 4.5 | $0.00021 | $0.00230 |
Grade A, and why
stepfun-asr 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 6d 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 — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
StepFun stepaudio-2.5-asr
Transcribe audio with StepFun's stepaudio-2.5-asr (released 2026-04, verified 2026-04-23). Long audio in one call, no chunking — but only if the request hits the right endpoint with the right body shape. The wrong endpoint returns an error that looks identical to "model doesn't exist", which is the #1 reason this skill exists.
Companion: for TTS with
stepaudio-2.5-tts(the sibling model), use thestepfun-ttsskill — they share an API key but live on different endpoints with different body shapes.
Why this skill exists — three traps that cost hours
-
Wrong endpoint, wrong error.
stepaudio-2.5-asrdoes not live on/v1/audio/transcriptions(that endpoint serves the olderstep-asrfamily). It lives on/v1/audio/asr/sse— SSE streaming, JSON body, base64 audio. Sending it to the wrong endpoint returns{"error":{"message":"model stepaudio-2.5-asr not supported"}}, which is identical in structure to a genuinely nonexistent model name. People waste hours filing whitelist tickets. -
Plan key vs Normal key, silent failure. StepFun's "Plan" subscription keys (cheap, text-only) cannot call audio endpoints, but the failure manifests as a 4xx with no auth-shaped error message. If your account has a Plan subscription, you need a separate "Normal" key from the same console.
-
SSE error events are real. Censorship can fire on the ASR side too (rarely). Don't assume only
transcript.text.deltaandtranscript.text.doneevents arrive — handletype: errorevents in the stream or you'll silently drop them.
Config and auth
API key resolves in this order (fail-fast, no defaults):
$STEPFUN_API_KEYenvironment variable${CLAUDE_PLUGIN_DATA}/config.jsonwith{"api_key": "..."}(cross-session persistence)
First-time setup:
mkdir -p "${CLAUDE_PLUGIN_DATA}" && cat > "${CLAUDE_PLUGIN_DATA}/config.json" <<EOF
{"api_key": "<paste Normal key here>"}
EOF
If the user has not set a key, ask them to paste it — do not guess or use a placeholder. Get keys at https://platform.stepfun.com/ → API Keys. Use a Normal key, not a Plan key.
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.
- 6d ago First seen · 135 lines · 209 tokens per session scan A f7dac6c93d54
stepfun-asr is a skill published in the GitHub repository daymade/claude-code-skills (1,377 stars, last pushed yesterday), licensed MIT. It adds 209 tokens to every session and 2,296 once invoked, about $0.0010 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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