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 skills add zgbrenner/agentcounsel --skill estoppel-snda-reviewgit clone --depth 1 https://github.com/zgbrenner/agentcounselWrote 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/zgbrenner/agentcounsel/estoppel-snda-review)<a href="https://agentmods.dev/skills/zgbrenner/agentcounsel/estoppel-snda-review"><img src="https://agentmods.dev/badge/skills/zgbrenner/agentcounsel/estoppel-snda-review/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/zgbrenner/agentcounsel/estoppel-snda-review"><img src="https://agentmods.dev/badge/skills/zgbrenner/agentcounsel/estoppel-snda-review.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00034 | $0.03430 |
| Opus 5 | $0.00017 | $0.01715 |
| Sonnet 5 | $0.00007 | $0.00686 |
| Haiku 4.5 | $0.00003 | $0.00343 |
Grade A, and why
Estoppel and SNDA Review 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 9d 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 — 266 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Estoppel and SNDA Review
Purpose
Produce a structured, attorney-ready review of an estoppel certificate, a subordination, non-disturbance and attornment agreement (SNDA), or a recognition agreement, from the perspective of the lender, tenant, or landlord. The skill surfaces the issues a reviewer should weigh before the document is negotiated or signed and, where the underlying lease is provided, compares the statements in the estoppel or SNDA against the lease so that discrepancies are caught before they are certified.
This skill produces draft work product for attorney review only. It is not legal advice. An estoppel binds the party that signs it, and an SNDA reorders rights among lender, landlord, and tenant; whether to sign one, and on what terms, is always an attorney and client decision.
Use When
- A user asks to "review this estoppel," "check this tenant estoppel against the lease," "review this SNDA," or "is this estoppel safe to sign."
- A lender or its counsel needs an estoppel and SNDA reviewed as part of acquisition or refinancing diligence.
- A tenant has received an estoppel certificate or an SNDA to sign and needs a first-pass review before responding.
- A landlord needs to confirm that an estoppel a tenant has returned, or one the landlord must deliver, is accurate.
- An estoppel or SNDA must be reconciled against the lease before it is certified or recorded.
Required Inputs
- The estoppel certificate, SNDA, or recognition agreement — uploaded or pasted in full. Do not review from a description, a partial excerpt, or a prior summary.
- The review perspective — lender, tenant, or landlord. The issues that matter differ by perspective, so this must be stated.
- The underlying lease and its amendments — optional but strongly preferred. The lease-versus-estoppel comparison can only be performed if the lease is provided. If the estoppel or SNDA references amendments, side letters, or other documents, note which were and were not provided.
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.
- 9d ago First seen · 266 lines · 34 tokens per session scan A 399a3ad902ae
Estoppel and SNDA Review is a skill published in the GitHub repository zgbrenner/agentcounsel (19 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 3,430 once invoked, about $0.0002 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 2026-09-03.
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