List every Compressed Knowledge Graph (CKG) domain this server can answer about.

Call this FIRST, before the other tools. Each domain is a self-contained dependency graph for one subject area (e.g. "calculus", "google-dataplex", "glp1-obesity"). The domain argument required by query_ckg, get_prerequisites, and search_concepts must be an exact name returned here. Takes no arguments.

Returns: One line: the domain count followed by the comma-separated domain names, e.g. "Available domains (65): algebra-1, aws-data-catalog, calculus, ...".

Return the dependency subgraph around a concept: what it requires, and what builds on it.

Use this for the local neighborhood of a concept — both the prerequisites it depends on and the downstream concepts that depend on it. For ONLY the upstream prerequisite chain, use get_prerequisites instead. If unsure of the exact concept name, call search_concepts first to find it.

Args: domain: Exact domain name from list_domains (e.g. "calculus", "google-dataplex"). concept: Concept to center the subgraph on. Matched case-insensitively; a partial name resolves to the first containing match (e.g. "taylor" -> "Taylor Series"). depth: Upstream prerequisite hops to include, 1-5 (default 3; higher values are capped at 5). Downstream "builds toward" concepts are always included to 2 hops.

Returns: A Markdown report titled with the resolved concept, with a "Prerequisites (what you need to know first)" tree and a "Builds toward (concepts that depend on this)" tree, plus the concept's taxonomy tag when present. If the concept is not found, returns a message listing up to 5 similar names to retry with.

Return the full ordered chain of concepts to understand before a target concept.

Use this for onboarding, gap-filling, or sequencing study — it walks every upstream dependency back to the root concepts. For a two-directional neighborhood (prerequisites AND dependents) use query_ckg; to resolve an exact concept name use search_concepts.

Args: domain: Exact domain name from list_domains. concept: Target concept to trace back to its roots. Matched case-insensitively; a partial name resolves to the first containing match.

Returns: One line listing the prerequisite chain in dependency order, e.g. "Prerequisite chain for 'Taylor Series' in calculus (5 concepts): Function -> Derivative -> ... -> Taylor Series". States that the concept is a root if it has no prerequisites, or that it was not found.

Find concepts in a domain by partial name — use this to discover exact concept labels.

Run this before query_ckg or get_prerequisites when you do not know the precise label a concept is stored under. Does a case-insensitive substring match over every concept name in the domain.

Args: domain: Exact domain name from list_domains. query: Substring to match against concept names (e.g. "mask", "iceberg", "lineage").

Returns: Up to 20 matching concept names (title-cased), each annotated with its taxonomy tag in brackets when present, e.g. " - Masking Policy [GOV]". Returns a "no concepts matching" message when there are no matches.