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/vlinx-io/velaterm/vspawn-treenpx skills add vlinx-io/VelaTerm --skill vspawn-treegit clone --depth 1 https://github.com/vlinx-io/VelaTermWrote 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/vlinx-io/velaterm/vspawn-tree)<a href="https://agentmods.dev/skills/vlinx-io/velaterm/vspawn-tree"><img src="https://agentmods.dev/badge/skills/vlinx-io/velaterm/vspawn-tree.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 | $0.00096 | $0.00872 |
| Opus 5 | $0.00048 | $0.00436 |
| Sonnet 5 | $0.00019 | $0.00174 |
| Haiku 4.5 | $0.00010 | $0.00087 |
Grade A, and why
vspawn-tree 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 — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/vspawn-tree
The user explicitly invoked /vspawn-tree (Claude) or $vspawn-tree (Codex) to request spawning a standalone
child session under the current vlx-term session,
passing the task in as its first message. The only difference from /vspawn: it opens a dedicated git worktree
for the child session (a separate workspace/branch), suited to cases where you don't want to pollute the current
workspace and want the child task to run on an isolated branch.
⚠️ This is not an in-process sub-agent, and not a background Task: it is a real, visible, interactive, resumable session tab in the vlx-term left-panel tree, run by its own process, leaving the current session undisturbed.
User input:
$ARGUMENTS
Step 1: Expand the user input into a "self-contained" rich prompt (critical)
The new child session is a brand-new conversation with no memory of this one. Do not forward the user's one-liner verbatim — as if handing the job to someone with zero context, use what is known from the current conversation to expand it into a task description that stands on its own. Write whichever of the following apply — don't pad:
- Goal: what needs to be achieved.
- Relevant files and paths: spell them out (absolute or relative), don't make them guess.
- Established facts / conclusions: key information from this conversation that they wouldn't know (e.g. an already-located root cause, an already-agreed convention).
- Constraints: tech stack, things that must not change, code-style requirements.
- Acceptance criteria: what counts as done.
Don't write "see above / as mentioned / continuing from earlier" — the new session can't see any of this. (If the user's input is already complete, or they explicitly say "keep it short," don't over-expand.)
Step 2: Detect type options
Detect "specifying claude / codex" from the user input (or a leading --claude / --codex) → add the matching
flag, and don't write it into the prompt. The default follows the current session type. (This command always
opens a worktree, so there's nothing to detect there.)
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 · 71 lines · 96 tokens per session scan A eb515f37afb1
vspawn-tree is a skill published in the GitHub repository vlinx-io/VelaTerm (112 stars, last pushed 3d ago), licensed MIT. It adds 96 tokens to every session and 872 once invoked, about $0.0005 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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