Use when an analysis over the context-intelligence graph is about to be written as naive Cypher — reach for Neo4j GDS (Graph Data Science) or APOC instead when the question is really a complex topology search: pathfinding, reachability, centrality/influence, community/clustering, topological/structural similarity, or finding similar event PATHS / trajectories (with or without a time dimension). Names the advantages of the graph-data-science package and the best-fit scenarios for it, so you stop hand-rolling traversals and re-deriving structure one hop at a time. This is the WHEN/WHY layer; the graph-query skill's "Push Work to the Database" section is the HOW.
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Use when an analysis over the context-intelligence graph is about to be written as naive Cypher — reach for Neo4j GDS (Graph Data Science) or APOC instead when the question is really a complex topology search: pathfinding, reachability, centrality/influence, community/clustering, topological/structural similarity, or finding similar event PATHS / trajectories (with or without a time dimension). Names the advantages of the graph-data-science package and the best-fit scenarios for it, so you stop hand-rolling traversals and re-deriving structure one hop at a time. This is the WHEN/WHY layer; the graph-query skill's "Push Work to the Database" section is the HOW.
license
MIT
metadata
{"version":"1.2.0","changelog":["1.2.0: Lifted patterns from a real graph exploration — TF-IDF weighting to defeat glue-tool dominance in similarity; read-only vector-property gds.knn fallback (no bipartite edges); a derived co-occurrence/teaming projection (distinct from the edge-less Agent-node dead end); apoc.map.fromPairs/apoc.coll.sort as a fourth primitive (in-graph frequency map); a read-only .stream/.stats vs .write/.mutate guardrail; and a 'When GDS itself isn't enough' boundary (structure vs intent → escalate to LLM embeddings).","1.1.0: Added the 'Complex topology searches' section — centrality, topological/structural similarity (nodeSimilarity/KNN/FastRP embeddings), and similar event PATHS / trajectories with-or-without a time dimension (set-similarity vs transition-signature), plus pathfinding and a non-lineage projection recipe. These are the hard searches the skill exists to route off naive Cypher.","1.0.0: Initial — GDS/APOC scenario-selection and advantages, avoid-naive-Cypher decision map, three reusable primitives tuned to this graph."]}
Context Intelligence — Graph Data Science First
The context-intelligence graph is large (millions of nodes across thousands of
sessions). Naive Cypher tends to re-derive, one hop and one round-trip at a time,
what a graph algorithm computes in a single server-side pass. This skill trains the
reflex: recognize the shape of the question, and when it is a graph-algorithm shape,
reach for GDS or APOC instead of improvising Cypher.
This skill is WHEN and WHY. The HOW lives next door. The graph-query skill owns
the schema meaning, the traps, and the worked projection queries — its Section 8,
"Push Work to the Database (APOC / GDS)" has the concrete gds.graph.project → algorithm → gds.graph.drop lifecycle and the Session/FORKED + agent-rollup
example. Load context-intelligence-graph-query for mechanics; use this skill to
decide whether the algorithm is the right tool at all.
The naive-query smell test
You are probably about to write naive Cypher where GDS/APOC would be better if you catch
yourself doing any of these:
Guessing edge types to walk a tree (-[:HAS_SUBSESSION|FORKED|HAS_FORK]->) or
repeatedly stepping Session.parent_id one hop at a time to rebuild a delegation tree.
collect() then size([x IN … WHERE …]) to count how many things are reachable /
match — reconstructing an algorithm's output by hand.
A giant WHERE node_id IN [ …50 literals… ] pasted into the query text (client-side
set-building shoved into Cypher).
UNWIND range(0, size(list)-2) to compute consecutive gaps / pairwise math.
Variable-length -[*1..n]-> followed by client-side filtering of the paths.
Pulling many rows to the client to iterate and aggregate what the DB could reduce.
Each of these is a tell that the question has a graph-algorithm shape.
What the graph-data-science package buys you (the advantages)
Advantage
Naive Cypher
GDS / APOC
One pass, not many round-trips
N queries + client stitching
project once, compute server-side, return a bounded result
Scales to the whole graph
degrades / times out on deep or wide traversals
algorithms are built for millions of nodes
Correct, not approximate
hand-rolled shortest-path / "influence" is easy to get subtly wrong
gds.shortestPath, gds.pageRank, gds.betweenness are the real thing
Less context churn
large client-side pulls flood the session
the payload never crosses the wire; only the answer does
Stable, reusable shapes
every question becomes a new bespoke query
a handful of parameterized primitives cover most questions
Best-fit scenarios → the right tool
Match the question shape to the tool. This is the core of the skill.
The question is really…
Naive trap
Reach for
Why it wins
Full delegation subtree / all descendants of a session
one-hop parent_id walks, edge-type guessing
apoc.path.expandConfig(root, {relationshipFilter:'FORKED>', minLevel:1, maxLevel:20}), or gds.bfs
one call returns the whole bounded lineage; respects Trap 1 (lineage is FORKED, notHAS_SUBSESSION)
How are two sessions connected / shortest path
manual -[*1..n]-> + filtering
gds.shortestPath.* (or apoc.path.expandConfig)
correct pathfinding in one pass
Which agent/session is a hub / most influential
collect + size degree-counting
gds.pageRank / gds.degree / gds.betweenness over Session/FORKED, rolled up by the Session.agent property
real centrality; see graph-query §8 for the exact projection + agent-rollup (agents are a property to roll up by, not a projectable graph)
Clusters / communities of related sessions
can't express it naively
gds.louvain / gds.wcc
community structure in one call
Sessions similar by shared tools/skills
pairwise collect intersections
gds.nodeSimilarity over a Session→Tool/Skill projection
scalable similarity instead of O(n²) hand-joins
Reach a JSON field inside Event.data
e.data.working_dir (raises a type error)
apoc.convert.fromJsonMap(e.data).working_dir
correct and lean — see graph-query §8's authoritative pattern
Operate over a known set of ids
50-id IN [ … ] literal
pass $ids and UNWIND $ids AS id
one reusable shape; for heavy scans, apoc.periodic.iterate
Consecutive-pair math (inter-event gaps)
UNWIND range(0,size-2)
apoc.coll.pairsMin(list)
expresses the intent directly
Complex topology searches — the hard ones this skill exists for
These are the searches naive Cypher either cannot express or does at O(n²) with
wrong/approximate results. When the question is one of these, do NOT hand-roll it —
project the right graph and run the algorithm.
1. Centrality / influence — "which sessions, agents, or tools are structurally most important?"
Project the relevant graph (Session/FORKED for delegation influence; a tool
co-occurrence graph for tool influence), stream, roll up by the property you care
about, gds.graph.drop.
By shared neighbors (same tools/skills/agents used): project a bipartiteSession → Tool (or →Skill/→Agent) graph → gds.nodeSimilarity (Jaccard/overlap)
or gds.knn.
By structural role (behave alike even without sharing exact neighbors):
gds.fastRP (or gds.node2vec) node embeddings → gds.knn for nearest structural
neighbors. This finds role-equivalent sessions.
Weight the vector before you compare it. Raw tool-usage counts are dominated by glue
tools (bash, read_file, todo) — un-weighted, every session looks similar and the
result is noise. Down-weight ubiquitous tools with a TF-IDF weighting (the same job
fastRP otherwise buys you), built in-graph with apoc.map.fromPairs(collect([tool_name, count])).
Read-only fallback — no bipartite edges needed. When the store is read-only and you
can't materialise Session→Tool edges, compute the weighted vector as a node property
inside the Cypher projection and run gds.knn(nodeProperties: ['toolVector']) directly on
it — same answer, no derived edges. (General principle: when an algorithm's naive input is
wrong or unavailable, reshape the input in the projection before reaching for a fancier algorithm.)
3. Similar event PATHS / trajectories — the sequence question, with or without time
This is the "find similar paths of events" search. The time dimension decides the tool:
WITHOUT time (bag of steps): reduce each session to its multiset of event/tool
types, then gds.nodeSimilarity/gds.knn over the Session → Tool projection. Order
is ignored — "used A, B, C" matches "used C, B, A".
WITH time (ordered trajectory): order matters, so build the ordering first. Sort
each session's events by started_at, form consecutive pairs with
apoc.coll.pairsMin(ordered_list), and materialise a transition signature —
(:Session)-[:HAS_TRANSITION]->(:TypePair {a,b}). Then either gds.nodeSimilarity
over that transition projection, or gds.fastRP + gds.knn to cluster whole
trajectories. This distinguishes A→B→C from A→C→B, which set-similarity cannot.
Extract one session's ordered path with apoc.path.expandConfig or a time-ordered
MATCH — never a client-side reconstruction.
gds.shortestPath.dijkstra · gds.allShortestPaths · Yen's k-shortest ·
gds.bfs/gds.dfs; or apoc.path.expandConfig for filtered reach.
Projection recipe (similarity/trajectory graphs are not stored edges — build them):
// bipartite Session→ToolCall for similarity (Cypher projection, GDS 2.x)
// confirm the Session→ToolCall reach against the graph-query skill / live schema first
CALL gds.graph.project.cypher('sess-tool',
'MATCH (n) WHERE n:Session OR n:ToolCall RETURN id(n) AS id',
'MATCH (s:Session)-[:HAS_EXECUTION|HAS_PART*1..3]->(tc:ToolCall)
RETURN id(s) AS source, id(tc) AS target');
CALL gds.nodeSimilarity.stream('sess-tool')
YIELD node1, node2, similarity
RETURN gds.util.asNode(node1).node_id AS a, gds.util.asNode(node2).node_id AS b, similarity
ORDER BY similarity DESC LIMIT 20;
CALL gds.graph.drop('sess-tool') YIELD graphName; // always release (in-memory only, no data touched)
Deriving a graph that isn't stored (co-occurrence / teaming). "Which agents work
together?" has no stored Agent→Agent edge — but you can derive one from shared group
membership (e.g. agents whose sessions share a parent), then run community/centrality on the
derived graph. This is valid and different from projecting the real (edge-less) Agent
nodes, which is the dead end graph-query §8 warns about — confirm the grouping edge against
the live schema first:
CALL gds.graph.project.cypher('agent-team',
'MATCH (s:Session) WHERE s.agent IS NOT NULL RETURN id(s) AS id, s.agent AS agent',
'MATCH (a:Session)<-[:FORKED]-(p)-[:FORKED]->(b:Session)
WHERE a.agent < b.agent RETURN id(a) AS source, id(b) AS target, count(*) AS weight');
CALL gds.louvain.stream('agent-team') YIELD nodeId, communityId RETURN communityId, count(*) LIMIT 20;
CALL gds.graph.drop('agent-team') YIELD graphName;
Four primitives that replace most naive Cypher here
Default to these instead of re-deriving structure:
The lineage walker — apoc.path.expandConfig over FORKED (or a Session/FORKED
GDS projection for tree analytics). This one primitive replaces the single largest
class of hand-rolled queries on this graph.
The JSON-lift reflex — never touch Event.data with dot-access; parse in-graph
with apoc.convert.fromJsonMap and return only the scalar (graph-query §8 is authoritative).
The parameterized id-set — UNWIND $ids, never a pasted literal list. Collapses a
long tail of "unique" queries into one reused shape.
The in-graph frequency map — apoc.map.fromPairs(collect([key, count])) builds a
per-node weight/vector map server-side (feeds TF-IDF gds.knn node properties). When
collecting a set as a grouping key, canonicalise it first with apoc.coll.sort so [A,B]
and [B,A] group as one.
When naive Cypher IS the right tool (don't over-reach)
GDS/APOC is not always the answer. A single plain Cypher statement already wins for:
counts and existence checks (RETURN count(*)),
single-session scalar lookups,
group-bys / distributions over one hop (GROUP BY tool_name),
Reach for the algorithm when the naive alternative means many round-trips, a large
client-side pull, or reconstructing an algorithm by hand — not for a plain aggregate.
When GDS itself isn't enough (the upper bound)
GDS answers structural / behavioral questions — how a session was executed, who is
central, what clusters by shape. It does not answer intent questions — what a session
was for. Tool-vector similarity clusters the machinery, not the mission. The tell: if you
cross-tab a GDS cluster against the human's actual objective and the same goal is scattered
across most clusters, stop iterating on GDS. Export the bounded inline text (e.g.
Prompt.prompt) and run LLM-embedding + k-means instead — a different tool for a different
question shape. Escalating to GDS is right; escalating past it when the question is
semantic is the next move, not more algorithms.
Guardrails
Probe first:RETURN gds.version() / CALL gds.list(); CALL apoc.help('path').
Both plugins run on the live target (Neo4j Community — GDS works).
Always release projections:gds.graph.drop('g') when done.
Behind a read-only-enforcing endpoint, use .stream / scalar .stats. The .write/
.mutate variants can be rejected (HTTP 500) even though they only touch the in-memory
catalog, not the store.
Bound the returned result even when the compute is server-side — count / aggregate
/ LIMIT. Pushing work to the DB does not excuse an unbounded RETURN.
Project the labels that exist — Session (nodes), FORKED (relationships). Agents
are a property (Session.agent) to roll up by, not a projectable graph.
Honor the schema traps — especially Trap 1 (delegation lineage is FORKED +
Session.parent_id, and HAS_SUBSESSION is a single hop). The graph-query skill owns
these; load it before writing the query.
