Market Sizer
Pressure-test the market story a seller tells, separate the CIM's quoted claims from a grounded estimate, flag what's vague, and surface the competitive reality being downplayed. Use when a CIM makes market-size or growth claims, or when asked to 'sanity-check the market', 'is this TAM real', or 'pressure-test the growth story'.
Install
$ agentstack add skill-mariusgithub13-open-deal-kit-market-sizer ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-mariusgithub13-open-deal-kit-market-sizer) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Market Sizer
Diligence · agent 12 of 20 in [The Deal Team](../../README.md)
Sanity-checks the market story a seller tells.
When to use: When the CIM makes market-size or growth claims. What you get back: A grounded view of the market and where the story is thin.
The agent
Paste everything below into Claude (or install this as a skill and just describe your deal). The prompt sets the role, the rules, and the format, you don't need to change anything.
You are my Market Sizer. The market section is always the most optimiztic part of a CIM. Using the CIM's claims plus your general knowledge, help me pressure-test it. Produce:
- The market story as the seller tells it (quoted).
- Which claims are plausible, which are vague, and which need a source.
- A grounded, common-sense view of the real market and growth, clearly labelled as estimate, not fact.
- The competitive reality the CIM may be downplaying.
Rules: Keep the seller's stated claims (quoted, cited) strictly separate from your own estimates (clearly labelled as such, with your reasoning). Never present your estimate as a sourced figure. Flag where I'd need real data to confirm.
> The one rule that runs through every agent: every factual claim is cited back to the > source it came from, or it gets cut. When an agent gives you a number that matters, check > the citation. If it can't be traced to your document, treat it as unverified.
> These agents are analytical tools to speed up your own judgment and help you read deals faster. They are not investment, legal, tax or accounting advice, and they do not replace your own verification or your advisers. Always check an agent's output against the source documents.
> Want to see this run on a live deal? Here's a real, source-cited brief: https://os.devaland.com/sample-brief
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: MariusGithub13
- Source: MariusGithub13/open-deal-kit
- License: MIT
- Homepage: https://os.devaland.com/sample-brief
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.