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bls-mcp-server MCP Server

Fetch US Bureau of Labor Statistics data — CPI, unemployment, wages, JOLTS, and more via MCP.

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Status

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Connect

Published as @cyanheads/bls-mcp-server on npm. Runs locally.

Known issues

72 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

bug(bls_get_series): one unknown SeriesID discards the whole batch's data

Summary

parseSeriesResponse currently throws as soon as any upstream message says a series does not exist or has no data. BLS can return those per-series advisories with REQUEST_SUCCEEDED and usable observations for other requested IDs, so one unresolved ID discards the rest of a successful batch.

Reproduction

{"name":"bls_get_series","arguments":{"series_ids":["LNS14000000","LNS99999999"],"start_year":2025,"end_year":2025}}

BLS returns observations for LNS14000000 an

Read the thread · 2026-08-02 · open · 4 comments

chore(canvas): remove vestigial dataframe truncation metadata

Use case

bls_get_series and bls_dataframe_describe advertise dataframe-materialization truncation metadata that this server never produces. CanvasBridge.registerDataframe() sends every supplied row to the framework's registerTable(), and its only production caller supplies neither a row cap nor a truncation flag. The exposed fields therefore add permanent false/absent values to two tool contracts without describing a real outcome.

Related: #46

Proposed behavior

Remove the u

Read the thread · 2026-07-17 · closed · 4 comments

bug(bls_list_surveys): AP and CW capability flags deny calculations the API returns

Server version

0.4.2

mcp-ts-core version

0.9.21

Runtime

Bun (hosted)

Runtime version

n/a — black-box via claude.ai connector

Transport

http (Streamable HTTP)

Description

bls_list_surveys reports allowsNetChange: false, allowsPercentChange: false for AP (Average Price Data) and CW (CPI-W), but bls_get_series with calculations: true returns calculations for both. The flags — and the bls_get_series guidance to "check bls_list_surveys first" — a

Read the thread · 2026-06-08 · closed · 3 comments

feat(bls_get_series): add request_echo and spill notice to structuredContent output

bls_get_series is the highest-value tool in this server — it fetches time-series data for the agent's chosen series. When results look wrong (unexpected year range, missing series data, wrong number of observations), there is no structured signal in structuredContent confirming what the server actually requested from the BLS API. Agents can only re-read the input schema and retry blind.

Status

Partial. Shipped in 0.2.3: bls_get_series got an enrichment block (totalObservations, `n

Read the thread · 2026-05-29 · closed · 3 comments

feat(responses): surface query echo and filter echo in structuredContent output

Three tools — bls_search_series, bls_list_surveys, and bls_get_latest — return results with no structured record of what parameters were actually applied. When an agent gets fewer results than expected, it has no way to confirm via structuredContent whether its filters were interpreted as intended (e.g., was survey: 'ce' treated as CE? was the category filter active?). Without parameter echo, the only debugging path is re-reading the input schema and retrying blind.

Status

Par

Read the thread · 2026-05-29 · closed · 3 comments

Most recent

bug(bls_dataframe_drop): provider failures erase metadata and report success

Server version

0.5.1

mcp-ts-core version

^0.12.3

Runtime

Bun 1.4.0

Transport

DataCanvas service path

Description

CanvasBridge.drop() deletes dataframe metadata before attempting the physical drop, then returns true when the provider operation throws. The caller is told the dataframe was dropped even though the table may still exist and its recovery metadata is gone.

Steps to reproduce

  1. Register a dataframe so its metadata exists in tenant state.
  2. Make `

Read the thread · 2026-08-31 · open · 0 comments

bug(bls-observations): partial routing violates request-order and missing-series contracts

Server version

0.5.1

mcp-ts-core version

^0.12.3

Runtime

Bun 1.4.0

Transport

Observation-mirror routing

Description

Partial observation-mirror routing can reorder bls_get_series.series[], despite the output schema declaring request order. With live fallback disabled, a missed SeriesID is also omitted from series[], contradicting the declared zero-observation entry contract.

Related: #25, #45

Steps to reproduce

  1. Configure a ready mirror that contains rows

Read the thread · 2026-08-31 · open · 0 comments

bug(bls-observations): sync subprocess never initializes the mirror service

Server version

0.5.1

mcp-ts-core version

^0.12.3

Runtime

Node.js 26.5.0

Transport

Direct observation-mirror worker invocation

Description

The documented observation-mirror init and scheduled refresh worker exits before syncing because the child entry calls getBlsObservationsService() without initializing the service.

Related: #26

Steps to reproduce

  1. Run bun run rebuild.
  2. Set BLS_OBSERVATIONS_MIRROR_ENABLED=true and a writable `BLS_OBSERVATIONS_MIRROR

Read the thread · 2026-08-31 · open · 0 comments

bug(bls_dataframe_query): registered schemas report every column as VARCHAR

Server version

0.5.1

mcp-ts-core version

^0.12.3

Runtime

Bun 1.4.0

Transport

HTTP (Streamable HTTP), CANVAS_PROVIDER_TYPE=duckdb

Description

bls_dataframe_describe reports every table registered by bls_dataframe_query as VARCHAR, regardless of the DuckDB result types. A client following the documented describe-before-query workflow receives a false schema for numeric and boolean expressions.

Steps to reproduce

  1. Materialize any bls_get_series spill t

Read the thread · 2026-08-31 · open · 0 comments

bug(bls_search_series): blank filters execute unfiltered searches

Server version

0.5.1

mcp-ts-core version

^0.12.3

Runtime

Bun 1.4.0

Transport

HTTP (Streamable HTTP)

Description

bls_search_series accepts blank survey and area filters, echoes them as applied, and silently executes an unfiltered search. This makes malformed input look like a successful filtered query.

Related: #18, #64

Steps to reproduce

  1. Call bls_search_series with {"query":"employment","survey":""}.
  2. Observe a successful broad result (`totalCou

Read the thread · 2026-08-31 · open · 0 comments

bug(bls_search_series): area filtering after the FTS cap returns false-empty results

Server version

0.5.1

mcp-ts-core version

^0.12.3

Runtime

Bun 1.4.0

Transport

HTTP (Streamable HTTP)

Description

bls_search_series applies area only after the FTS candidate query has already been capped at 1,000 rows. Broad national terms can fill that pool before any local series is considered, so a valid geographic workflow returns a false empty result.

Related: #7, #62

Steps to reproduce

  1. Call bls_search_series with `{"query":"unemployment rate","are

Read the thread · 2026-08-31 · open · 0 comments

feat(bls_get_series): spill response names only bls_dataframe_query — canvas column names unreachable

Use case

When bls_get_series spills, the inline preview is not the canvas schema: it uses camelCase fields, while the dataframe contains snake_case columns and additional fields. A spill response that directs callers straight to bls_dataframe_query makes them guess the SQL columns.

Related: #66

Proposed behavior

For an enabled canvas, every spill discovery surface must give the same two-step workflow: call bls_dataframe_describe with dataset.name to inspect column_schema, t

Read the thread · 2026-08-13 · closed · 1 comment

See all 23 reports Pod holds for bls-mcp-server — of 72 qualified upstream.

Firsthand observations

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