bls-labor-mcp-server
Server Details
Fetch US Bureau of Labor Statistics data — CPI, unemployment, wages, JOLTS, and more via MCP.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP
- URL
- Repository
- cyanheads/bls-labor-mcp-server
- GitHub Stars
- 1
- Server Listing
- @cyanheads/bls-labor-mcp-server
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Usage analytics
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Tool Definition Quality
Average 4.6/5 across 6 of 6 tools scored.
Each tool serves a distinct purpose: searching, listing, fetching, describing, and querying. No overlap between tools like bls_get_latest and bls_get_series, which have clear scope differences.
All tools follow the bls_verb_noun pattern in snake_case, e.g., bls_search_series, bls_get_latest, bls_dataframe_query. Consistent and predictable.
Six tools cover the essential workflow: discovery (list, search), retrieval (get_latest, get_series), and analysis (describe, query). Neither too few nor too many.
Covers the full read lifecycle from discovery to analysis. Minor gaps like a dedicated metadata tool for specific series, but search_series returns sufficient info. Overall well-scoped.
Available Tools
6 toolsbls_dataframe_describeDescribe BLS DataframesARead-onlyIdempotentInspect
List canvas dataframes materialized by bls_get_series, with provenance (source tool, query parameters), TTL, row count, and column schema. Use before writing SQL to confirm column names. Lazy-sweeps expired tables before responding. Requires CANVAS_PROVIDER_TYPE=duckdb.
| Name | Required | Description | Default |
|---|---|---|---|
| name | No | Optional table name (df_XXXXX_XXXXX) to describe a single dataframe. Omit to list all active dataframes. |
Output Schema
| Name | Required | Description |
|---|---|---|
| dataframes | Yes | Active dataframes for this tenant, newest first. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds behavioral details beyond annotations: 'Lazy-sweeps expired tables before responding' and 'Requires CANVAS_PROVIDER_TYPE=duckdb.' Annotations already indicate read-only and idempotent, and the description enhances transparency without contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is concise with three sentences: first states purpose, second provides usage guidance, third notes behavioral traits and a requirement. It is front-loaded and contains no superfluous information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one optional parameter, no required inputs, output schema present), the description covers all relevant aspects: what it returns, when to use it, behavioral nuance, and a prerequisite. It is fully adequate for an AI agent to invoke correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the parameter is fully documented in the schema. The description does not add new semantic meaning beyond the schema, meeting the baseline expectation but not exceeding it.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool lists dataframes materialized by bls_get_series with specific attributes (provenance, TTL, row count, column schema). It distinguishes from siblings like bls_dataframe_query and bls_get_series, and includes a concrete use case (confirm column names before SQL).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly recommends using this tool 'before writing SQL to confirm column names.' While it does not list alternatives or exclusions, the context provided by sibling tool names implies differentiation, making the guidance clear.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
bls_dataframe_queryQuery BLS DataframesARead-onlyIdempotentInspect
Run a single-statement SELECT against the canvas dataframes registered by bls_get_series. Read-only: writes, DDL, DROP, COPY, PRAGMA, ATTACH, and external-file table functions are rejected. System catalogs (information_schema, pg_catalog, sqlite_master, duckdb_*) are denied at the bridge layer — use bls_dataframe_describe to list available dataframes. Supports JOINs, aggregates, window functions, and CTEs. Optional register_as persists the result as a new dataframe with a fresh TTL for chained analysis. Canvas SQL operations consume zero BLS API quota. Requires CANVAS_PROVIDER_TYPE=duckdb.
| Name | Required | Description | Default |
|---|---|---|---|
| sql | Yes | Single-statement SELECT against df_<id> tables on the shared canvas. Reference dataframes by the names returned in bls_get_series responses or listed by bls_dataframe_describe. Standard DuckDB SQL — joins, aggregates, window functions, CTEs all supported. Example: SELECT series_id, year, period, value FROM df_AAAAA_BBBBB WHERE year >= '2020' ORDER BY year DESC. | |
| preview | No | Inline row preview count. Defaults to row_limit. Set lower (e.g. 50) when chaining via register_as and only a sample is needed immediately. | |
| row_limit | No | Hard cap on rows materialized in the response (default 1000, max 10000). Full results live on-canvas under register_as when provided. | |
| register_as | No | When set, persist the query result as a new dataframe under this name. Fresh TTL — not inherited from parent tables. Use to chain analyses without re-running source SQL or consuming additional BLS quota. |
Output Schema
| Name | Required | Description |
|---|---|---|
| rows | Yes | Materialized rows, bounded by preview / row_limit. |
| notice | No | Guidance when results were capped by preview or row_limit — names which parameter was the binding limiter and suggests how to retrieve the rest. Absent when all rows fit in the response. |
| columns | Yes | Column names in projection order. |
| row_count | Yes | Total rows the query produced (may exceed rows.length when capped by row_limit). |
| expires_at | No | ISO 8601 expiry for the newly registered dataframe, when applicable. |
| registered_as | No | Set when register_as was supplied and the result was materialized. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and idempotentHint=true. Description adds significant behavioral detail: rejected operations, system catalog denial, zero BLS quota consumption, and register_as persistence with fresh TTL. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Single paragraph is dense but well-organized: action first, then constraints, then alternatives, then capabilities, then side effects. Every sentence adds value, but slightly front-loading could improve scanability.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given tool complexity (SQL query with 4 params, output schema exists), description covers use case, constraints, alternatives, parameter semantics, quota impact, and persistence behavior. Complete for effective use without needing external documentation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%. Description adds valuable context beyond schema: for 'sql' provides example and naming convention; 'preview' explains usage for chaining; 'row_limit' gives default and max; 'register_as' explains persistence and TTL inheritance. Each parameter gains meaning.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description clearly states the tool runs a single-statement SELECT against canvas dataframes registered by bls_get_series. It distinguishes from sibling bls_dataframe_describe by noting that tool lists available dataframes. Specific verb+resource with scope.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly states it is read-only and lists rejected operations (writes, DDL, DROP, etc.). Directs users to bls_dataframe_describe for listing dataframes and mentions supported SQL features. Provides clear when-to-use and when-not-to-use guidance.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
bls_get_latestGet Latest BLS ObservationARead-onlyIdempotentInspect
Return the single most recent observation for one or more BLS series. Use for "what is X right now" questions — the current unemployment rate, the latest CPI reading, etc. Each series consumes one API query against the 500/day limit; for the current value of many series, bls_get_series with a 1-year window is more quota-efficient (one query for up to 50 series). Recommended limit: 10 series; maximum: 50.
| Name | Required | Description | Default |
|---|---|---|---|
| series_ids | Yes | One or more BLS SeriesIDs (1–50). Each consumes one daily API query. Use bls_search_series to resolve concepts to SeriesIDs. Recommended: ≤10 series. |
Output Schema
| Name | Required | Description |
|---|---|---|
| failed | Yes | Series that failed to fetch. Inspect seriesId and error for per-item details. Not-found series appear here rather than as a tool-level error. |
| notice | No | Guidance when one or more series failed — e.g. to use bls_search_series to verify SeriesIDs. Absent when all series returned data. |
| results | Yes | Successfully fetched series with their latest observations. Series that failed appear in failed[] instead. |
| succeeded | Yes | Number of series with a successfully fetched observation. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, and open-world hints. The description adds valuable behavioral context: each series consumes one API query against a 500/day limit, which is beyond what annotations provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Three sentences with no filler. First sentence states purpose, second gives concrete examples, third explains limits and trade-offs. Every sentence adds value.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given a single required parameter and presence of an output schema (not shown but indicated), the description covers purpose, usage, and limitations well. Could optionally detail output format, but output schema likely fills that gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% and the schema description for series_ids already specifies types, limits, and usage. The description reinforces the quota efficiency point but does not add significant new parameter-level detail beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool returns the single most recent observation for BLS series. It provides specific verb ('return') and resource, and distinguishes from sibling tools (bls_get_series) by explaining when each is appropriate.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly tells when to use ('what is X right now' questions) and when not to (for many series, use bls_get_series). Also provides recommended and maximum limits (10 and 50 series) and mentions quota efficiency.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
bls_get_seriesGet BLS Time-Series DataARead-onlyInspect
Fetch time-series data for 1–50 BLS series by SeriesID in a single API request (one query against the 500/day limit). Supports optional year range (up to 20 years per request) and BLS-computed period-over-period calculations (net change and percent change; a survey returns whichever it supports and silently omits the rest — CPI and PPI return percent change only, the inflation rate). Observations cover real periods only and are safe to sum or average as returned; set annual_average to add each year's annual-average row, which is that year's mean rather than an additional period. When the total observation count would exceed the inline context budget, results spill to a canvas dataframe and the response includes a dataset.name handle for follow-up SQL via bls_dataframe_query. Use bls_search_series first if you need to resolve a concept to a SeriesID.
| Name | Required | Description | Default |
|---|---|---|---|
| end_year | No | End year for the data range (inclusive). Defaults to the current year when omitted. | |
| series_ids | Yes | One or more BLS SeriesIDs (1–50). The entire batch counts as one API query. Use bls_search_series to resolve concepts to SeriesIDs. | |
| start_year | No | Start year for the data range (inclusive). The BLS API allows up to 20 years per request. Omit for the API default (typically 3–20 years depending on survey). | |
| calculations | No | When true, request BLS-computed period-over-period calculations. The flag is a single boolean (you cannot select an individual calculation type), but the API returns whichever the survey supports and omits the rest — CPI and PPI return percent change only (the inflation rate), and a survey that supports neither simply returns its observations without calculation fields. Requesting calculations never fails, so it is always safe to set; consult bls_list_surveys (allowsNetChange / allowsPercentChange) only to predict which fields will come back. Monthly-cadence series return each supported change type over 1, 3, 6, and 12-month intervals; other cadences return a subset. | |
| annual_average | No | When true, add each year's annual-average row to the observations. An annual average is the mean of that year's real periods, returned as an extra row named "Annual" with period M13 (monthly series), Q05 (quarterly) or S03 (semiannual) — not an additional month or quarter, so it must be excluded from any sum or average over observations. Defaults to false, which returns real periods only and is safe to aggregate directly. Independent of start_year/end_year. Surveys that publish no annual averages return the same rows either way; enrichment.annualAverageRows reports how many rows were actually added. |
Output Schema
| Name | Required | Description |
|---|---|---|
| notice | No | Guidance for agents — names any SeriesID that returned zero observations, and reports when results spilled to canvas and SQL is needed for full access. Absent when every requested series returned data and it all fit inline. |
| series | Yes | Series data, in request order. |
| dataset | No | Canvas dataframe handle — present when the observation volume exceeded the inline budget. Use bls_dataframe_query with dataset.name to run SQL across the full data. |
| spilled | Yes | True when results spilled to canvas due to inline budget overflow. |
| endYearApplied | No | End year in effect, when a range was requested. |
| seriesRequested | Yes | Number of SeriesIDs requested. Do not compare it against series[] length to find empty series — a SeriesID that returned no data is still listed in series[] with observationCount 0. Check observationCount per entry, or read notice, which names every SeriesID that came back empty. |
| startYearApplied | No | Start year in effect, when a range was requested. |
| annualAverageRows | No | How many observations across all series are annual-average rows (period M13/Q05/S03). Present only when annual_average is true; 0 means none of the requested surveys publish annual averages. |
| totalObservations | Yes | Total observation rows across all requested series. |
| calculationsApplied | No | Whether BLS net/percent-change calculations were requested. |
| annualAverageApplied | Yes | Whether annual-average rows were requested. When false, observations hold real periods only and can be summed or averaged directly. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnly and openWorld, but description adds critical behavioral details: API query limits, date range constraints, BLS-computed calculations behavior per survey, annual average semantics, and spillover mechanism.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Every sentence adds unique value. Description is front-loaded with main purpose, followed by key constraints and usage tips. No wasted words.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given a complex tool with an output schema, the description covers all important aspects: usage order, parameter behavior, edge cases, and spillover to other tools. Complete for effective use.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so baseline is 3. Description adds significant value by explaining calculations behavior, annual average mean, and defaults, though some details could be shorter.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('fetch') and resource ('time-series data for 1-50 BLS series by SeriesID'), and distinguishes from siblings like bls_search_series and bls_dataframe_query.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly advises to use bls_search_series first to resolve concepts, and mentions spillover to bls_dataframe_query for large results. However, it does not explicitly contrast with bls_get_latest for single-value needs.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
bls_list_surveysList BLS SurveysARead-onlyIdempotentInspect
List BLS survey programs with their abbreviation codes, full names, and metadata about calculation support and annual averages. Use to discover which survey covers a topic before calling bls_search_series. Optional category filter narrows results to prices, employment, wages, productivity, injuries, or time_use surveys.
| Name | Required | Description | Default |
|---|---|---|---|
| category | No | Optional category filter. One of: prices, employment, wages, productivity, injuries, time_use. Omit to list all surveys. |
Output Schema
| Name | Required | Description |
|---|---|---|
| total | Yes | Total surveys returned. |
| surveys | Yes | BLS survey programs matching the filter, sorted alphabetically by abbreviation. |
| categoryFilter | No | Category filter applied, if any. Absent when all surveys were listed. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint and idempotentHint, covering safety. The description adds context about the returned metadata but does not disclose additional behavioral traits beyond what annotations convey. It does not contradict annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences with no wasted words. The first sentence states purpose and content, the second gives usage guidance and filter details. Information is front-loaded and efficient.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With a single optional parameter, clear annotations, and an output schema, the description covers all necessary context. It specifies what is included in the list and how to use the filter, making it self-sufficient for an agent.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with one parameter fully described. The description adds value by explaining that the category filter 'narrows results' to specific survey topics, providing context beyond the enum list.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'List' and the resource 'BLS survey programs', specifying the output includes abbreviation codes, full names, and metadata. It distinguishes from siblings by noting it is used before calling bls_search_series to discover which survey covers a topic.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly states when to use the tool ('discover which survey covers a topic before calling bls_search_series') and describes the optional category filter to narrow results. This provides clear guidance on context and alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
bls_search_seriesSearch BLS SeriesARead-onlyInspect
Search the BLS series catalog by natural language query, survey code, geographic area, or keywords to resolve cryptic SeriesIDs. Returns matching series with decoded components (survey, area, item, seasonal flag) and plain-language names. Use this before bls_get_series when you have a concept but not a SeriesID. Operates offline — no API quota consumed. Survey filter accepts two-letter codes (CU, CE, LN, LA, PC, JT, OE, EC, PR). Area filter accepts state names, MSA names, or FIPS area codes.
| Name | Required | Description | Default |
|---|---|---|---|
| area | No | State name, MSA name, or FIPS area code to narrow results to a geographic area. Omit for national series. | |
| limit | No | Maximum number of results to return (1–50, default 10). | |
| query | Yes | Natural language or keyword query (e.g. "unemployment rate", "CPI food", "nonfarm payrolls"). Also accepts a SeriesID directly for exact lookup. | |
| survey | No | Two-letter LABSTAT survey abbreviation to filter results (e.g. CU for CPI, CE for CES, LN for CPS, LA for LAUS, JT for JOLTS, OE for OEWS). Omit to search all loaded surveys. | |
| seasonal_adjustment | No | When true, return only seasonally adjusted series. When false, return only not-seasonally-adjusted. Omit to return both. |
Output Schema
| Name | Required | Description |
|---|---|---|
| cap | No | The result limit that capped the returned list. |
| shown | No | Number of series returned in this response. |
| capped | Yes | True when the FTS candidate pool reached the internal cap (~1000). totalCount is then a lower bound, not an exact match count. Narrow the query, add survey/area filters, or use a direct SeriesID to get an exact count. |
| notice | No | Guidance when no results matched — e.g. how to broaden the query or remove filters. Absent when results are returned. |
| series | Yes | Matching series, ordered by relevance. |
| truncated | No | True when more candidates matched than the limit returned. |
| areaFilter | No | Area filter applied, if any. Absent when no area filter was passed. |
| totalCount | Yes | Total candidates scored before the limit was applied. A lower bound when capped is true — the catalog index may contain more matching series. |
| catalogSize | Yes | Total series in the loaded catalog index. Distinguishes an empty-result search from a failed catalog load. |
| limitApplied | Yes | Result limit in effect (defaults to 10 when omitted). |
| surveyFilter | No | Survey filter applied, if any. Absent when no survey filter was passed. |
| effectiveQuery | Yes | Query string as the server received and searched on. Confirms interpretation for self-correction. |
| seasonalFilter | No | Seasonal-adjustment filter applied, if any. Absent when not passed. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations include readOnlyHint and openWorldHint, which indicate safe, read-only behavior. The description adds that it operates offline without consuming API quota, which is useful beyond annotations. No contradictions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single paragraph but well-structured with purpose upfront. Every sentence adds value, though it could be slightly more concise. No wasted words.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has 5 parameters, 100% schema coverage, and an output schema (not shown but referenced), the description covers search modes, filters, and offline behavior comprehensively. It is complete for its complexity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, and the description adds meaning beyond the schema: explains that query accepts natural language or SeriesID, survey filter two-letter codes, area filter state/MSA/FIPS, and seasonal_adjustment boolean. This adds value.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description clearly states the tool searches the BLS series catalog by various criteria to resolve cryptic SeriesIDs, and distinguishes from sibling bls_get_series by saying 'Use this before bls_get_series when you have a concept but not a SeriesID.' The verb 'search' and resource 'BLS series catalog' are specific.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Description explicitly says when to use (when you have a concept but not a SeriesID) and provides details on filters (survey codes, area types). It mentions offline operation and no API quota. However, it does not explicitly state when not to use it, though that is implied.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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