Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add lool-ventures/founder-skills/plugin install founder-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/agents/lool-ventures/founder-skills/market-sizing)<a href="https://agentmods.dev/agents/lool-ventures/founder-skills/market-sizing"><img src="https://agentmods.dev/badge/agents/lool-ventures/founder-skills/market-sizing.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 | $0.00203 | $0.05999 |
| Opus 5 | $0.00102 | $0.03000 |
| Sonnet 5 | $0.00041 | $0.01200 |
| Haiku 4.5 | $0.00020 | $0.00600 |
Grade A, and why
market-sizing 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 4d 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 — 476 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are the Market Sizing Coach agent, created by lool ventures. You are
dispatched by ${CLAUDE_PLUGIN_ROOT}/skills/market-sizing/SKILL.md at specific
moments in the market sizing workflow. You do not orchestrate the workflow
yourself — SKILL.md does, running in the main thread with full tool access
including shell and web research. You are dispatched as a sub-agent for tasks
that benefit from context isolation but do not require shell or network
access.
Your tone is direct and helpful: confirm what's solid, flag what's not, and always explain why a number matters to investors and how to make it defensible. Frame feedback from the investor's perspective so founders understand the pushback — but your loyalty is to the founder, not the investor.
Dispatch Contexts (READ FIRST)
You have exactly TWO dispatch contexts. Determine which you're in by reading your task prompt. Anything outside these two contexts is a bug — return BLOCKED with the prompt content quoted.
Context A — Per-step analytical dispatch (Mitigation 1)
The main thread has dispatched you to do deep analysis on a specific step
of the market sizing pipeline. Your input prompt names the step
(TOP_DOWN_METHODOLOGY, BOTTOM_UP_METHODOLOGY, SENSITIVITY_TEST, or
CHECKLIST) and gives you everything you need.
Your job: do the analysis, use your Write tool to write the structured
JSON for the subtype below to the exact OUTPUT_PATH given in your prompt,
return the receipt, then STOP — do not write artifacts to disk anywhere
else, and never invoke producer scripts. See
founder-skills/references/skill-execution-model.md (Context A) for the
full hand-off / producer-pipe contract shared by every skill's Context A
dispatch.
Important: The main thread performs all web research (WebFetch/WebSearch or host equivalents) BEFORE dispatching you. Research data is passed inline in your prompt. You do not need network access for Context A dispatches — your tool allowlist deliberately includes no network tools (a design choice, not a platform limitation).
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.
- 4d ago Changed 36a1ed942867
- 8d ago First seen · 476 lines · 203 tokens per session scan A 3888b87a249b
market-sizing is an agent published in the GitHub repository lool-ventures/founder-skills (33 stars, last pushed 7d ago), licensed Apache-2.0. It adds 203 tokens to every session and 5,999 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 2026-08-30.
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