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 bitwize-music-studio/claude-ai-music-skills --skill session-startgit clone --depth 1 https://github.com/bitwize-music-studio/claude-ai-music-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/bitwize-music-studio/claude-ai-music-skills/session-start)<a href="https://agentmods.dev/skills/bitwize-music-studio/claude-ai-music-skills/session-start"><img src="https://agentmods.dev/badge/skills/bitwize-music-studio/claude-ai-music-skills/session-start/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/bitwize-music-studio/claude-ai-music-skills/session-start"><img src="https://agentmods.dev/badge/skills/bitwize-music-studio/claude-ai-music-skills/session-start.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 4 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 | $0.00035 | $0.01890 |
| Opus 5 | $0.00017 | $0.00945 |
| Sonnet 5 | $0.00007 | $0.00378 |
| Haiku 4.5 | $0.00003 | $0.00189 |
Grade A, and why
session-start 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 13d 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 — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Your Task
Run the full session start procedure and report project status to the user.
Session Start Skill
You perform the 8-step session startup procedure that initializes a working session.
Step 1: Verify Setup
Quick dependency check:
~/.bitwize-music/venv/bin/python3 -c "import mcp" 2>&1 >/dev/null && echo "MCP ready" || echo "MCP missing" # macOS/Linux/WSL
~/.bitwize-music/venv/Scripts/python.exe -c "import mcp" 2>&1 >/dev/null && echo "MCP ready" || echo "MCP missing" # Windows (Git Bash; cmd/PowerShell: %USERPROFILE%\.bitwize-music\venv\Scripts\python.exe)
- If MCP missing: Stop immediately and suggest:
/bitwize-music:setup mcp - If config missing (
~/.bitwize-music/config.yamldoesn't exist): suggest/bitwize-music:configure - Don't proceed until setup is complete
Step 1.5: Health Check
Use the health_check MCP tool (checks venv packages + skill registration + album slug collisions in one call):
Venv results (from result.venv):
status: "ok"→ continue silentlystatus: "stale"→ warn with mismatches and fix command, continue sessionstatus: "no_venv"→ stop and suggest/bitwize-music:setupstatus: "error"→ warn and continue
Skill registration results (from result.skills):
status: "ok"→ continue silentlystatus: "stale"→ warn: list missing and ghost skill names, show fix messagestatus: "no_cache"→ warn that plugin cache not found, continue
Album slug collision results (from result.collisions):
status: "ok"→ continue silentlystatus: "collision"→ warn: list each slug with its kept and shadowed genres, show the fix (rename one album with/bitwize-music:renameor move its directory, then runrebuild_state), continue session
Step 2: Load Config
Read ~/.bitwize-music/config.yaml.
If missing, tell user to run /bitwize-music:configure.
Step 3: Load Overrides
Read paths.overrides from config (default: {content_root}/overrides):
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.
- 13d ago First seen · 205 lines · 35 tokens per session scan A 46ff07c65b96
session-start is a skill published in the GitHub repository bitwize-music-studio/claude-ai-music-skills (483 stars, last pushed 2d ago), licensed CC0-1.0. It adds 35 tokens to every session and 1,890 once invoked, about $0.0002 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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