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 commands/stratalab/strata-core/branch.fork_at_versiongit clone --depth 1 https://github.com/stratalab/strata-coreWrote 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/commands/stratalab/strata-core/branch.fork_at_version)<a href="https://agentmods.dev/commands/stratalab/strata-core/branch.fork_at_version"><img src="https://agentmods.dev/badge/commands/stratalab/strata-core/branch.fork_at_version.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 | $0.00000 | $0.00166 |
| Opus 5 | $0.00000 | $0.00083 |
| Sonnet 5 | $0.00000 | $0.00033 |
| Haiku 4.5 | $0.00000 | $0.00017 |
Grade A, and why
branch.fork_at_version 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 3d 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
Forks a new branch anchored at a retained commit version of the source branch, giving time-travel semantics: the new branch sees exactly the data visible at that version. A version outside retained history fails with history_unavailable.engine.persistence_history.
This command has no dedicated CLI verb: the CLI expresses it as strata branch fork <SOURCE> <BRANCH> --version <VERSION> (one shared branch fork verb routes to all three fork commands, so only branch.fork owns the CLI path). It remains fully reachable through the generic wire surface — strata command run, MCP, and SDKs.
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.
- 3d ago First seen · 9 lines · 0 tokens per session scan A af3ca1209d36
branch.fork_at_version is a command published in the GitHub repository stratalab/strata-core (2 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 166 tokens. 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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