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Trace Filter Expressions

• Trace intrinsics — trace_id, start_time, end_time, and latency_ms.
• Span rollups, never null — num_spans, error_count, token_count_prompt, token_count_completion, token_count_total, prompt_cost, completion_cost, total_cost, tool_span_count, and llm_span_count all read 0 when there is no matching data.
• Root-span reach-through — input, output, attributes["llm.model_name"], metadata["key"], and user.id read the trace’s root span.
• Comprehensions over what’s inside — iterate spans, trace_annotations, span_annotations, and span_cost_details with any, all, len, max, min, and sum.
• Topology — a span exposes children, parent_span, and siblings, so parent-child shapes are expressible directly.
• Strict names — unlike span filters, an unknown name is rejected with a “did you mean” suggestion rather than silently read as an attribute path that matches nothing.

num_spans > 10 and error_count > 0

max(span.latency_ms for span in spans) > 5_000

any(span.parent_span.span_kind == "LLM" and span.span_kind == "TOOL" for span in spans)

trace_annotations["quality"].score < 0.5 and total_cost > 0.25

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Read-Only Analytics SQL over MCP

• describeSqlSchema publishes the queryable schema as DDL, with the curation a database cannot supply: which area a table belongs to (telemetry, datasets, experiments), what one row means, how to reach the project, which JSON paths are populated, and — at detail="full" — the running deployment’s expression indexes, read live from the catalog.
• executeSql runs one read-only statement and returns columns and rows, plus the limits that applied. validate_only=True checks a statement without running it.
• Bounded by capability, not identity — read-only statements only, 500 rows by default and 5000 at most, byte caps per row and per response, a statement deadline, and a bounded execution queue. Admission is an allowlist over the parsed statement tree, so casing, comments, and nesting cannot smuggle anything past it.
• Both backends declared, not hidden — SQLite and PostgreSQL are supported, and a refusal names the spelling that works on the backend you’re on (percentile(x, p) on SQLite, percentile_cont(p) WITHIN GROUP (ORDER BY x) on PostgreSQL).
• Two columns Phoenix adds — latency_ms and graphql_node_id are computed per row on both backends; graphql_node_id is the same ID the Phoenix UI and REST API show.

SELECT attributes -> 'llm' ->> 'model_name' AS model,
       percentile_cont(0.95) WITHIN GROUP (ORDER BY latency_ms) AS p95_ms,
       count(*) AS spans
FROM spans
WHERE span_kind = 'LLM'
  AND start_time >= '2026-08-10T00:00:00Z'
GROUP BY 1
ORDER BY p95_ms DESC

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Annotation Details on Hover

• Every annotation, not just the summary — score, label, and explanation for each one, with the mean score in the header colored by the config’s optimization direction.
• Who wrote it — the annotator kind (human or LLM) and the author.
• Filter from the popover — inline filter chips append the matching condition to the table’s filter, so a suspicious label becomes a filtered table in one press.
• Reachable without a mouse — the trigger is a button, so keyboard focus and long press open the same popover a hover does.

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Approval Decisions on PXI Tool Spans

from phoenix.client import Client
from phoenix.client.types.spans import SpanQuery

query = SpanQuery().where("attributes['pxi.approval.decision'] == 'rejected'")
rejected = Client().spans.get_spans_dataframe(query=query, project_identifier="my-project")

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Also in This Release

• Dialogs behave the same everywhere — every viewport dialog dismisses from its backdrop, Escape closes the innermost overlay first, and focus returns where it started (arize-phoenix 20.3.0+).
• The PXI assistant stays reachable while a dialog is open, and pressing its rail never dismisses the dialog underneath (arize-phoenix 20.3.0+).
• Tooltips no longer swallow clicks aimed at the controls beneath them, and menus keep the page scrollable while open (arize-phoenix 20.3.0+).
• Refreshed built-in token prices so cost tracking stays accurate for the current model lineup (arize-phoenix 20.2.0+ and 20.2.1+).