> ## Documentation Index
> Fetch the complete documentation index at: https://platform.atlan.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> To act on Atlan objects, use the Atlan MCP server at https://api.atlan.com/mcp or the SDK. To install or publish skills from a terminal, use the `aireg` CLI; `aireg --map json` prints its command map. The `atlanai` CLI is deprecated. Run a read-only identity check before any write.
> The docs MCP server at /mcp searches these docs only. It cannot read or change Atlan objects.
> SDK packages: Python `atlanai` (PyPI) and TypeScript `@atlanai/sdk` (npm). Show Python first, then TypeScript.
> These docs cover Atlan AI Registry, Atlan's hosted product. The AI registry specification and aireg CLI are maintained separately. /open-source lists publicly reachable signed installers and explains that the source repository and hosted CLI reference currently require GitHub access. Do not claim the repository or its reference docs are publicly accessible. Use these docs for Atlan-specific setup such as the adapter, sign-in and workspaces.

# Glossary

> Look up the objects, versions, and interfaces you encounter in AI Registry, with links to their full guides.

Use this glossary to look up a term and find the guide that explains it.

| Term | Meaning | Learn more |
| - | - | - |
| Agent | A registered identity for an agent you use, with its skills, versions, and recorded activity. | [How agents work](/concepts/how-agents-work) |
| AI Gateway | Model Gateway and MCP Gateway together: model requests and tool calls through Atlan. | [AI Gateway](/gateway/index) |
| AI Registry | Atlan's product for sharing skills, managing agent records, and reviewing their activity. | [What is AI Registry](/) |
| App | An installed extension that adds capabilities and can be made available in selected workspaces. | [Find your installed apps](/registry/apps/how-tos/find-installed-apps) |
| Artifact | A stored object, such as a skill, agent, or metric, owned by a workspace. | [Platform architecture](/platform/references/architecture) |
| Atlan Desktop | The desktop app for browsing your workspaces and importing local skills and coding sessions. | [Install Atlan Desktop](/desktop/install) |
| Binding | A release-pinned declaration mapping ontology definitions to physical sources and fields. | [Bindings](/ontology/concepts/bindings) |
| Channel | A named pointer to a release, such as `latest`. Moving it does not change the release. | [How releases work](/concepts/how-releases-work) |
| Dataset | Named cases an eval uses to test a task. | [Create eval datasets](/evals/datasets) |
| Eval | A test of a task against cases and scoring criteria. | [How evals work](/concepts/how-evals-work) |
| Experiment | The recorded results of an eval run, including case scores and available traces. | [Eval objects reference](/evals/concepts) |
| FinOps | Views of recorded model usage and cost, across agents, people, and time. | [FinOps](/finops/index) |
| Library | The place to find outputs recorded by agents, such as documents and reports. | [Save outputs to the Library](/registry/agents/how-tos/save-outputs-to-library) |
| MCP Gateway | The Atlan connection through which clients discover and call first-party and remote MCP tools. | [MCP Gateway](/gateway/mcp/index) |
| Metric | A versioned business measure with SQL and context explaining its meaning. | [How metrics work](/studios/metrics/concepts) |
| Metrics Studio | The app for writing, sharing, and releasing metrics and saved queries. | [Metrics Studio](/studios/metrics-studio) |
| Model Gateway | The Atlan connection for calling your organization's configured models through compatible provider APIs. | [Model Gateway](/gateway/model/index) |
| Ontology | A versioned model of business objects, properties, relationships, and terminology. | [Ontology](/ontology/index) |
| Personal workspace | Your private workspace for imported skills and individual work. | [How workspaces work](/registry/workspaces/index) |
| Release | A published, immutable selection of object versions. | [How releases work](/concepts/how-releases-work) |
| Scorer | A function or judge that assesses a result against criteria. | [Write code scorers](/evals/scorers) |
| Session | A conversation or interaction that groups related activity and traces. | [How sessions and traces work](/concepts/how-sessions-and-traces-work) |
| Skill | Instructions and supporting files that teach a client how to perform a task. | [How skills work](/concepts/how-skills-work) |
| Span | One timed step in a trace, such as a model call or tool call. | [Trace attributes](/registry/traces/references/attributes) |
| Trace | A connected record of steps in an agent run. | [Traces](/registry/traces/index) |
| Workspace | The scope that owns objects and controls who can find, use, and change them. | [How workspaces work](/registry/workspaces/index) |

## Earlier names

| Earlier name | Current name |
| - | - |
| Agent Registry | AI Registry. Some on-screen labels still use the earlier name. |
| `atlanai` CLI | `aireg`. The Python package is still named `atlanai`. See [Move to aireg](/tools/brain/how-tos/migrate). |
| Context | Metrics Studio and Ontology have their own sections in Platform. |


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