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 Pawel-Kica/claude-code-100 --skill spawn-new-sessiongit clone --depth 1 https://github.com/Pawel-Kica/claude-code-100Wrote 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/pawel-kica/claude-code-100/spawn-new-session)<a href="https://agentmods.dev/skills/pawel-kica/claude-code-100/spawn-new-session"><img src="https://agentmods.dev/badge/skills/pawel-kica/claude-code-100/spawn-new-session.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 | $0.00016 | $0.00368 |
| Opus 5 | $0.00008 | $0.00184 |
| Sonnet 5 | $0.00003 | $0.00074 |
| Haiku 4.5 | $0.00002 | $0.00037 |
Grade A, and why
spawn-new-session 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 8d 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
Peer agents, not subagents: full Claude sessions in their own cmux tabs, each with its own context and permissions, user watching.
Run
- Write a brief per agent to
~/.claude/spawns/<YYYY-MM-DD-HHMM>-<slug>.md. It is the whole handoff — the tab inherits nothing from this conversation. ~/.claude/skills/spawn-new-session/scripts/spawn-agent.sh --brief <path> --cwd <dir> --label <slug>.--cwd= current working dir unless the task clearly belongs elsewhere. Always spawn in background — never pass--focus true, even if the user says they will watch; they switch tabs themselves.--splitfor a pane,--prompt <text>to override the default kickoff prompt. cmux only — exits 3 if the cmux socket is unreachable.cmux read-screen --surface <ref> --lines 30— expect the Claude TUI.- Report a table: Task | Tab | Brief. Then stop — the tabs own that work now.
Brief
# <title>
## Objective — done, in a line
## Context — decisions already made and why, constraints, gotchas; specs/PRs by path or URL
## Where — cwd, key files
## Do — ordered steps
## Goal / Done When — checkable criteria
## Suggested skills — /<skill>, why
A brief that ends in git commit/push says in writing that user approves first.
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.
- 8d ago First seen · 29 lines · 16 tokens per session scan A ae3c3a563fe0
spawn-new-session is a skill published in the GitHub repository Pawel-Kica/claude-code-100 (2 stars, last pushed 15d ago), licensed MIT. It adds 16 tokens to every session and 368 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 2026-08-31.
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