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Delete a memory entry by key. Use to remove outdated or incorrect facts from persistent memory.

Run a relational query over agent state. Relations: `memory` (persistent memory entries: key, value, namespace, type, references, createdAt, updatedAt), `tool_calls` (recent tool call history: name, args, result, timestamp), `tasks` (active goal's task list: id, desc, status, rounds, note). Query language is expr-lang: filter(relation, predicate) selects rows (e.g. filter(memory, .type == "error")), map(relation, expr) projects fields, join(left, right, leftField, rightField) equi-joins two relations into rows with left_/right_ prefixed fields, union(a, b) combines two relations with set semantics. String operators are infix: .value contains "x", .value startsWith "x", .value endsWith "x", .value matches "regex"; lower()/upper() are functions (lower(.value)); membership is .key in ["a", "b"].

Save a fact to persistent memory. The memory is injected into every LLM call automatically. Use for project conventions, user preferences, key decisions, or any information that should persist across sessions. Keys should be short and descriptive.

Search persistent memory for entries matching a query. Returns up to 20 matching key-value pairs (each value capped), best match first: a key hit outranks a value-only hit, more query words outrank fewer, and a newer update breaks a tie. Use to recall previously saved facts, preferences, or decisions. There is no memory_list tool; the memory graph is already in the system prompt.