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/stellarshenson/claude-code-plugins/hypothesisnpx skills add stellarshenson/claude-code-plugins --skill hypothesisgit clone --depth 1 https://github.com/stellarshenson/claude-code-pluginsWrote 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/stellarshenson/claude-code-plugins/hypothesis)<a href="https://agentmods.dev/skills/stellarshenson/claude-code-plugins/hypothesis"><img src="https://agentmods.dev/badge/skills/stellarshenson/claude-code-plugins/hypothesis.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 | $0.00206 | $0.04073 |
| Opus 5 | $0.00103 | $0.02037 |
| Sonnet 5 | $0.00041 | $0.00815 |
| Haiku 4.5 | $0.00021 | $0.00407 |
Grade A, and why
hypothesis scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Hypothesis
Maintain two research docs: a canonical experiments log (every hypothesis with setup, prediction, result, verdict) and a SOTA document (survivors distilled into a final design). Log is append-only and grows across runs; SOTA is rewritten when the arc converges.
Style - terse technical-documentation: 1-2 overview sentences then factual bullets; one fact per bullet; numbers inline; no full stop ending a bullet; no em-dashes (use
-), unicode arrows (→), escape\$. Prose only where an argument needs it. Full reference: thetechnical-documentationskill.
Mirror the closest examples/ doc before writing - its section order wins over this skill's guidance on any conflict. Do not invent structure. See Examples for which to pick.
Toolchain gate (MANDATORY - run before anything else)
Run this first, every session, before any other work. The upgrade always runs; a version mismatch blocks.
python3 -m pip install --user --upgrade stellars-claude-code-plugins 2>&1 | tail -1
LIB=$(python3 -c "import importlib.metadata as m;print(m.version('stellars-claude-code-plugins'))" 2>/dev/null) || { echo "FATAL: toolkit unavailable"; exit 1; }
PLUG=$(grep -m1 '"version"' "${CLAUDE_PLUGIN_ROOT}/.claude-plugin/plugin.json" 2>/dev/null | cut -d'"' -f4)
OLDER=$(printf '%s\n%s\n' "$LIB" "$PLUG" | sort -V | head -1)
[ -n "$PLUG" ] && [ "$LIB" != "$PLUG" ] && [ "$OLDER" = "$LIB" ] && { echo "STALE: library $LIB older than plugin $PLUG - refusing to run on an outdated CLI; re-run the upgrade"; exit 1; }
echo "toolkit $LIB"
Run the CLI without touching the caller's project. The gate above puts it on PATH, so the bare command name is the whole invocation. uv run instead resolves whatever project the working directory sits in and writes uv.lock and .venv into it, so if you reach for uv pass --no-project (uv run --no-project <cli> ...) - it skips project discovery, leaves the tree untouched and still finds the same PATH binary. --no-sync and --frozen are not substitutes; both still create .venv.
What ships with it
20 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.
- examples/lexical-grounding-experiments.md 53 KB
- examples/lexical-grounding-sota.md 18 KB
- examples/quantized-inference-experiments.md 34 KB
- examples/summary-table.md 5.1 KB
- examples/wmd-docdistance-experiments.md 12 KB
- examples/wmd-docdistance-sota.md 19 KB
- generators/contrarian.md 1.7 KB
- generators/deflationist.md 1.7 KB
- generators/follower.md 1.4 KB
- generators/heretical.md 1.7 KB
- generators/hybridizer.md 1.8 KB
- generators/mechanist.md 1.7 KB
- generators/scout.md 1.7 KB
- references/execution-and-ablation.md 3.2 KB
- references/experiments-log-structure.md 2.2 KB
- references/fanout.md 9.5 KB
- references/ledger-queries.md 5.8 KB
- references/per-hypothesis-template.md 7.9 KB
- references/sota-document.md 3.1 KB
- references/summary-tables.md 3.6 KB
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 · 133 lines · 206 tokens per session scan A 31d570e01a67
hypothesis is a skill published in the GitHub repository stellarshenson/claude-code-plugins (3 stars, last pushed 4d ago), licensed MIT. It adds 206 tokens to every session and 4,073 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 2026-08-31.
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