Noaa Swpc

Solar Wind

solar_wind

Read-onlyIdempotent

Real-time solar wind from the active spacecraft (DSCOVR/ACE): plasma (proton speed km/s, density p/cm³, temperature K) plus interplanetary magnetic field (bt, and bz in GSE/GSM — sustained southward bz_gsm is what drives geomagnetic storms). 1-minute cadence, last 24 hours available.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`window`	No	How many trailing minutes of 1-minute samples to return: 5-minute (default, current conditions) \| 1-hour \| 2-hour \| 1-day

Output Schema

TableJSON Schema

Name	Required	Description
`mag`	No	Solar wind magnetometer data from DSCOVR
`plasma`	No	Solar wind plasma data from DSCOVR
`source`	No
`window`	No	The requested time window (5-minute, 2-hour, 1-hour, or 1-day)
`spacecraft`	No
`requested_samples`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedSep 24, 2026
- changedOutput schema / properties / plasma / properties / measurements / items / properties / proton_vx_gsm / type
```
Previous value: -"number"New value: +[
+  "number",
+  "null"
+]
```
- changedOutput schema / properties / plasma / properties / measurements / items / properties / proton_vy_gsm / type
```
Previous value: -"number"New value: +[
+  "number",
+  "null"
+]
```
- changedOutput schema / properties / plasma / properties / measurements / items / properties / proton_vz_gsm / type
```
Previous value: -"number"New value: +[
+  "number",
+  "null"
+]
```
Changed3 schema fields changedSep 3, 2026
- changedOutput schema / properties / plasma / properties / measurements / items / properties / proton_vx_gse / type
```
Previous value: -"number"New value: +[
+  "number",
+  "null"
+]
```
- changedOutput schema / properties / plasma / properties / measurements / items / properties / proton_vy_gse / type
```
Previous value: -"number"New value: +[
+  "number",
+  "null"
+]
```
- changedOutput schema / properties / plasma / properties / measurements / items / properties / proton_vz_gse / type
```
Previous value: -"number"New value: +[
+  "number",
+  "null"
+]
```

Changed10 schema fields changedJul 29, 2026

changedInput schema / properties / window / description

Previous value: -"5-minute (default) | 1-day | 2-hour | 1-hour"New value: +"How many trailing minutes of 1-minute samples to return: 5-minute (default, current conditions) | 1-hour | 2-hour | 1-day"

removedOutput schema / properties / mag / items

Removed value: -{
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

addedOutput schema / properties / mag / properties

Added value: +{
+  "count": {
+    "type": "number"
+  },
+  "measurements": {
+    "items": {
+      "properties": {
+        "active": {
+          "type": "boolean"
+        },
+        "bt": {
+          "type": "number"
+        },
+        "bx_gse": {
+          "type": "number"
+        },
+        "bx_gsm": {
+          "type": "number"
+        },
+        "by_gse": {
+          "type": "number"
+        },
+        "by_gsm": {
+          "type": "number"
+        },
+        "bz_gse": {
+          "type": "number"
+        },
+        "bz_gsm": {
+          "type": "number"
+        },
+        "manual_mode": {
+          "type": "boolean"
+        },
+        "max_data_flag": {
+          "type": "number"
+        },
+        "max_telemetry_flag": {
+          "type": "number"
+        },
+        "overall_quality": {
+          "type": "number"
+        },
+        "phi_gse": {
+          "type": "number"
+        },
+        "phi_gsm": {
+          "type": "number"
+        },
+        "range": {
+          "type": "null"
+        },
+        "sample_size": {
+          "type": "number"
+        },
+        "scale": {
+          "type": "null"
+        },
+        "sensitivity": {
+          "type": "null"
+        },
+        "source": {
+          "type": "string"
+        },
+        "theta_gse": {
+          "type": "number"
+        },
+        "theta_gsm": {
+          "type": "number"
+        },
+        "time_tag": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "type": "array"
+  },
+  "span": {
+    "properties": {
+      "newest": {
+        "type": "string"
+      },
+      "oldest": {
+        "type": "string"
+      }
+    },
+    "type": "object"
+  }
+}

changedOutput schema / properties / mag / type

Previous value: -"array"New value: +"object"

removedOutput schema / properties / plasma / items

Removed value: -{
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

addedOutput schema / properties / plasma / properties

Added value: +{
+  "count": {
+    "type": "number"
+  },
+  "measurements": {
+    "items": {
+      "properties": {
+        "active": {
+          "type": "boolean"
+        },
+        "alpha_density": {
+          "type": "null"
+        },
+        "alpha_sample_size": {
+          "type": "null"
+        },
+        "alpha_speed": {
+          "type": "null"
+        },
+        "alpha_temperature": {
+          "type": "null"
+        },
+        "alpha_vx_gse": {
+          "type": "null"
+        },
+        "alpha_vx_gsm": {
+          "type": "null"
+        },
+        "alpha_vy_gse": {
+          "type": "null"
+        },
+        "alpha_vy_gsm": {
+          "type": "null"
+        },
+        "alpha_vz_gse": {
+          "type": "null"
+        },
+        "alpha_vz_gsm": {
+          "type": "null"
+        },
+        "max_convergence_flag": {
+          "type": "number"
+        },
+        "max_data_flag": {
+          "type": "number"
+        },
+        "max_error_count_flag": {
+          "type": "number"
+        },
+        "max_processing_flag": {
+          "type": "number"
+        },
+        "max_range_flag": {
+          "type": "number"
+        },
+        "max_sample_count_flag": {
+          "type": "number"
+        },
+        "max_telemetry_flag": {
+          "type": "number"
+        },
+        "overall_quality": {
+          "type": "number"
+        },
+        "proton_density": {
+          "type": "number"
+        },
+        "proton_sample_size": {
+          "type": "number"
+        },
+        "proton_speed": {
+          "type": "number"
+        },
+        "proton_temperature": {
+          "type": "number"
+        },
+        "proton_vx_gse": {
+          "type": "number"
+        },
+        "proton_vx_gsm": {
+          "type": "number"
+        },
+        "proton_vy_gse": {
+          "type": "number"
+        },
+        "proton_vy_gsm": {
+          "type": "number"
+        },
+        "proton_vz_gse": {
+          "type": "number"
+        },
+        "proton_vz_gsm": {
+          "type": "number"
+        },
+        "source": {
+          "type": "string"
+        },
+        "time_tag": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "type": "array"
+  },
+  "span": {
+    "properties": {
+      "newest": {
+        "type": "string"
+      },
+      "oldest": {
+        "type": "string"
+      }
+    },
+    "type": "object"
+  }
+}

changedOutput schema / properties / plasma / type
```
Previous value: -"array"New value: +"object"
```
addedOutput schema / properties / requested_samples
```
Added value: +{
+  "type": "number"
+}
```
addedOutput schema / properties / source
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / spacecraft
```
Added value: +{
+  "type": "string"
+}
```

Changed5 schema fields changedJun 2, 2026

addedOutput schema / properties / mag / items

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

changedOutput schema / properties / mag / type

Previous value: -"object"New value: +"array"

addedOutput schema / properties / plasma / items

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

changedOutput schema / properties / plasma / type
```
Previous value: -"object"New value: +"array"
```

removedOutput schema / required

Removed value: -[
-  "window",
-  "plasma",
-  "mag"
-]

Changed2 schema fields changedMay 22, 2026

addedInput schema / examples

Added value: +[
+  {
+    "window": "5-minute"
+  },
+  {
+    "window": "1-day"
+  }
+]

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "mag": {
+      "description": "Solar wind magnetometer data from DSCOVR",
+      "type": "object"
+    },
+    "plasma": {
+      "description": "Solar wind plasma data from DSCOVR",
+      "type": "object"
+    },
+    "window": {
+      "description": "The requested time window (5-minute, 2-hour, 1-hour, or 1-day)",
+      "type": "string"
+    }
+  },
+  "required": [
+    "window",
+    "plasma",
+    "mag"
+  ],
+  "type": "object"
+}

First observedMay 16, 2026

TDQS

A4.1/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already establish read-only, idempotent, non-destructive behavior. The description adds valuable behavioral context beyond that: source spacecraft, data cadence, trailing window availability, coordinate systems (GSE/GSM), and the physical significance of southward bz_gsm. This is exactly the kind of disclosure that helps an agent reason about the result.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single dense, front-loaded sentence with no wasted words. It packs in source, units, coordinates, cadence, availability, and domain meaning without becoming unwieldy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a one-optional-parameter tool with an output schema present, the description fully covers what data is included, its source, units, cadence, time windows, coordinate systems, and why a key field matters. Nothing an agent needs to invoke it correctly is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and the single `window` parameter is fully documented in the schema, so the baseline of 3 applies. The description reinforces the cadence and real-time nature but does not need to add parameter syntax details; it adds no surprises.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states what the tool provides: real-time solar wind data from DSCOVR/ACE, including plasma properties and magnetic field components with units. It is unambiguous about the resource and data contents. However, it does not explicitly differentiate itself from sibling tools like aurora_forecast or kp_index, so it stops short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage context is implied through phrases like 'Real-time', '1-minute cadence', and 'last 24 hours available', which suggests use for current solar wind conditions. The description gives no explicit when-to-use guidance, exclusions, or mentions of alternatives, so an agent must infer selection from context.

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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