Countersignatory
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Use
- For
- Teams building AI agents that need a named human to verify risky or irreversible actions.
- Company
- Countersignatory Ltd · Domain since 2026privacy policy · domain registered
- Used for
- Get a named human to check an agent's irreversible action
- Obtain a qualified person's sign-off on regulated agent decisions
- Route ambiguous agent cases to a screened human reviewer
- Has an MCP server (1 in the registry)public registry →
- Publishes llms.txt, a file written for AI assistantscountersignatory.com ↗
- Run byCountersignatory Ltdprivacy policy ↗
These are Countersignatory's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.
- MCP servercom.countersignatory/mcpverified in the MCP registry
- Stateanswers, 5 toolschecked 2026-10-24
- Address to connectcountersignatory.com/mcp
- API docscountersignatory.com/llms.txtthe vendor's page ↗
This card as JSON, for your agent →
Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.
Figure and bar: visits/mo, estimate · year: online since
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Not it? Say what you need
betaThree tools from the Atlas for the job you describe, each with what fits and what does not.
No notes yet. What do you use Countersignatory for?
Sign in to leave a noteWhat is Countersignatory?
Prices a named human reviewer to examine, verify or countersign an AI agent's decision, via API and spot market. It is listed in the Atlas under Security and made by Countersignatory Ltd.
Who is Countersignatory for?
Teams building AI agents that need a named human to verify risky or irreversible actions.
Do people use Countersignatory?
Little sign of use.
Who owns Countersignatory?
Countersignatory is run by Countersignatory Ltd, per its privacy policy (2026-10-24).
What are alternatives to Countersignatory?
In Security, by use: TruthScan, Arcjet, Qualisend, Holonym Foundation, deepidv, LeadProof.
How we read a tool
No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.
- Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
- Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
- Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
- The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.
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How we read every tool → · By INITE Atlas Desk
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