# Glossary

Canonical URL: https://agent.payrail.one/docs/glossary
Markdown URL: https://agent.payrail.one/docs/glossary.md
Summary: Use this page when a docs page mentions a term you do not recognize.
Description: Plain-language definitions for recurring Payrail Agent terms used across product and developer docs.

## Canonical Answer

Use this page when a docs page mentions a term you do not recognize. Plain-language definitions for recurring Payrail Agent terms used across product and developer docs. Protected payment and identity data stays behind Payrail Agent requests instead of entering LLM-visible context.

## Core Product Terms

These terms describe the public Payrail Agent product model.

Term | Meaning
--- | ---
Payrail Agent | The agent payment layer that owns sessions, requests, approvals, protected-data handling, and payment execution.
Payrail Agent Card | The simple user-facing payment instrument and balance abstraction given to an agent.
Payrail Agent Fill | The deliberately small actuator that materializes protected values into exact targets supplied by a host browser.
Payrail Agent Search | The semantic registry used to find provider-method URLs, docs, and guidance.
Payrail Agent Memory | The user-owned store for reusable data an agent can use — logins, identity, addresses, and payment methods. Often shortened to "Memory".

## Runtime Terms

These terms appear in SDK, API, and agent setup docs.

Term | Meaning
--- | ---
Runtime | The environment where the agent runs, such as Codex, Claude, OpenClaw, ChatGPT, or another supported tool.
Skill | A reusable instruction bundle that tells a runtime how to use Payrail Agent or built-in browser.
Remote MCP | The authenticated remote tool server that owns Payrail Agent sessions, approvals, protected grants, and reconciliation.
Workflow session | One Payrail Agent server-side task grouping related requests and events.

## Request and Memory Terms

These terms describe the human-in-the-loop and context-isolation payment model.

Term | Meaning
--- | ---
Request | One user-facing checkpoint for an approval, a choice, a protected value, or an action.
Approval | Explicit user authorization that allows a payment or another sensitive operation to continue.
Artifact | The one-time result of a completed request.
Memory item | A reusable user-owned record (login, identity, address, payment method) that holds related fields.
Handle | An opaque reference to a stored value, materialized only inside the trusted fill path and never shown to the model.
Secret | A field marked sensitive, such as a password, card number, CVV, or document number. The marker adds stricter handling — redaction, logging, and extra caution — on top of normal Memory handling. It is not a separate release path.
Profile fact | Reusable open user-provided data with a flexible key, such as name, preference, or task-specific facts.
Trust rule | A policy that decides whether a request can auto-resolve or must ask the user.

## Related

- Entities: https://agent.payrail.one/docs/reference/entities
- API Reference: https://agent.payrail.one/docs/api
- Payrail Agent Memory fill: https://agent.payrail.one/docs/components/memory-fill