Polarion MCP Server

getFeatureSelection

Read-only

Retrieves a specific Polarion feature selection by project, work item, selection type, and target IDs, so you can inspect one selection without listing the full collection.

Instructions

Returns the specified Feature Selection. Cardinality: targets a single item by ID. For the full collection or a batch, use getFeatureSelections instead.

Input Schema

Name	Required	Description	Default
`fields`	No	Sparse fieldset selector: an object keyed by resource type (e.g. `workitems`) whose value is a comma-separated list of attribute names to return (e.g. `id,title,status`), reducing payload size. Omit to return the default field set.
`include`	No	Comma-separated list of related resource types to embed in the response (e.g. `author,attachments`) so they don't require a separate follow-up call. Omit to return only the primary resource.
`revision`	No	A specific repository revision (e.g. `1234`) to read the resource as it existed at that revision instead of the current HEAD. Omit to use the latest revision.
`projectId`	Yes	The Polarion project ID (its URL segment, e.g. `myproject`), case-sensitive. Required to scope the request to one project. If the ID is unknown, ask the user; getProjects lists IDs only with global read access.
`workItemId`	Yes	The Work Item's ID within its project (e.g. `WI-123`), not the combined `project/id` path used in some link payloads.
`response_format`	No	Response detail level. concise removes redundant HTML and JSON:API metadata and may use a small default fieldset on large lists; detailed preserves the complete response. Defaults to detailed.	detailed
`selectionTypeId`	Yes	The Selection Type ID.
`targetProjectId`	Yes	The Target Project ID.
`targetWorkItemId`	Yes	The Target Work Item ID.

Output Schema

Name	Required	Description
`data`	No
`links`	No
`included`	No	Related entities might be returned, see <a href="https://docs.sw.siemens.com/en-US/doc/230235217/PL20250606201928474.polarion_help_sc.xid2134849/xid2134871" target="_blank">REST API User Guide</a>.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv1.4.4Oct 29, 2026

changedInput schema / properties / projectId / description

Previous value: -"The Polarion project ID (its URL segment, e.g. `myproject`), case-sensitive. Required to scope the request to one project; call getProjects to list valid IDs."New value: +"The Polarion project ID (its URL segment, e.g. `myproject`), case-sensitive. Required to scope the request to one project. If the ID is unknown, ask the user; getProjects lists IDs only with global read access."

Changed1 schema field changedv1.4.0Oct 24, 2026

addedInput schema / properties / response_format

Added value: +{
+  "default": "detailed",
+  "description": "Response detail level. concise removes redundant HTML and JSON:API metadata and may use a small default fieldset on large lists; detailed preserves the complete response. Defaults to detailed.",
+  "enum": [
+    "concise",
+    "detailed"
+  ],
+  "type": "string"
+}

Changed47 schema fields changedv1.3.1Oct 22, 2026
- removedOutput schema / properties / data / properties / attributes / properties / selectionType / enum
```
Removed value: -[
-  "excluded",
-  "included",
-  "implicitly-included"
-]
```
- removedOutput schema / properties / data / properties / attributes / properties / selectionType / example
```
Removed value: -"excluded"
```
- changedOutput schema / properties / data / properties / attributes / properties / selectionType / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / attributes / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / id / example
```
Removed value: -"MyProjectId/MyWorkItemId/included/MyProjectId/MyWorkItemId"
```
- changedOutput schema / properties / data / properties / id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / links / properties / self / example
```
Removed value: -"server-host-name/application-path/projects/MyProjectId/workitems/MyWorkItemId/featureselections/included/MyProjectId/MyWorkItemId?revision=1234"
```
- changedOutput schema / properties / data / properties / links / properties / self / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / links / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / detail / example
```
Removed value: -"Unexpected token, BEGIN_ARRAY expected, but was : BEGIN_OBJECT (at $.data)"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / detail / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / parameter / example
```
Removed value: -"revision"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / parameter / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / pointer / example
```
Removed value: -"$.data"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / pointer / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / resource / properties / id / example
```
Removed value: -"MyProjectId/id"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / resource / properties / id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / resource / properties / type / example
```
Removed value: -"type"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / resource / properties / type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / properties / resource / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / source / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / status / example
```
Removed value: -"400"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / meta / properties / errors / items / properties / title / example
```
Removed value: -"Bad Request"
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / properties / title / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / meta / properties / errors / items / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / meta / properties / errors / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / meta / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / properties / id / example
```
Removed value: -"MyProjectId/MyWorkItemId"
```
- changedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / properties / id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / properties / revision / example
```
Removed value: -"1234"
```
- changedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / properties / revision / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / properties / type / enum
```
Removed value: -[
-  "workitems"
-]
```
- changedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / properties / type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / relationships / properties / workItem / properties / data / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / relationships / properties / workItem / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / data / properties / relationships / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / revision / example
```
Removed value: -"1234"
```
- changedOutput schema / properties / data / properties / revision / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- removedOutput schema / properties / data / properties / type / enum
```
Removed value: -[
-  "featureselections"
-]
```
- changedOutput schema / properties / data / properties / type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / data / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / included / items / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / included / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- removedOutput schema / properties / links / properties / self / example
```
Removed value: -"server-host-name/application-path/projects/MyProjectId/workitems/MyWorkItemId/featureselections/included/MyProjectId/MyWorkItemId?revision=1234"
```
- changedOutput schema / properties / links / properties / self / type
```
Previous value: -"string"New value: +[
+  "string",
+  "number",
+  "integer",
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / links / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```

Changed5 schema fields changedv1.2.0Sep 17, 2026

changedInput schema / properties / fields / description

Previous value: -"Filter returned resource fields. See <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20250606201928474.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a> for details."New value: +"Sparse fieldset selector: an object keyed by resource type (e.g. `workitems`) whose value is a comma-separated list of attribute names to return (e.g. `id,title,status`), reducing payload size. Omit to return the default field set."

changedInput schema / properties / include / description

Previous value: -"Include related entities. See <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20250606201928474.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a> for details."New value: +"Comma-separated list of related resource types to embed in the response (e.g. `author,attachments`) so they don't require a separate follow-up call. Omit to return only the primary resource."

changedInput schema / properties / projectId / description

Previous value: -"The Project ID."New value: +"The Polarion project ID (its URL segment, e.g. `myproject`), case-sensitive. Required to scope the request to one project; call getProjects to list valid IDs."

changedInput schema / properties / revision / description

Previous value: -"The revision ID."New value: +"A specific repository revision (e.g. `1234`) to read the resource as it existed at that revision instead of the current HEAD. Omit to use the latest revision."

changedInput schema / properties / workItemId / description

Previous value: -"The Work Item ID."New value: +"The Work Item's ID within its project (e.g. `WI-123`), not the combined `project/id` path used in some link payloads."

Changed1 schema field changedv1.1.0Sep 11, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "data": {
+      "properties": {
+        "attributes": {
+          "properties": {
+            "selectionType": {
+              "enum": [
+                "excluded",
+                "included",
+                "implicitly-included"
+              ],
+              "example": "excluded",
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "id": {
+          "example": "MyProjectId/MyWorkItemId/included/MyProjectId/MyWorkItemId",
+          "type": "string"
+        },
+        "links": {
+          "properties": {
+            "self": {
+              "example": "server-host-name/application-path/projects/MyProjectId/workitems/MyWorkItemId/featureselections/included/MyProjectId/MyWorkItemId?revision=1234",
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "meta": {
+          "properties": {
+            "errors": {
+              "items": {
+                "properties": {
+                  "detail": {
+                    "description": "Human-readable explanation specific to this occurrence of the problem.",
+                    "example": "Unexpected token, BEGIN_ARRAY expected, but was : BEGIN_OBJECT (at $.data)",
+                    "type": "string"
+                  },
+                  "source": {
+                    "properties": {
+                      "parameter": {
+                        "description": "String indicating which URI query parameter caused the error.",
+                        "example": "revision",
+                        "type": "string"
+                      },
+                      "pointer": {
+                        "description": "JSON Pointer to the associated entity in the request document.",
+                        "example": "$.data",
+                        "type": "string"
+                      },
+                      "resource": {
+                        "description": "Resource causing the error.",
+                        "properties": {
+                          "id": {
+                            "example": "MyProjectId/id",
+                            "type": "string"
+                          },
+                          "type": {
+                            "example": "type",
+                            "type": "string"
+                          }
+                        },
+                        "type": "object"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  "status": {
+                    "description": "HTTP status code applicable to this problem.",
+                    "example": "400",
+                    "type": "string"
+                  },
+                  "title": {
+                    "description": "Short, human-readable summary of the problem.",
+                    "example": "Bad Request",
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "relationships": {
+          "properties": {
+            "workItem": {
+              "properties": {
+                "data": {
+                  "properties": {
+                    "id": {
+                      "example": "MyProjectId/MyWorkItemId",
+                      "type": "string"
+                    },
+                    "revision": {
+                      "example": "1234",
+                      "type": "string"
+                    },
+                    "type": {
+                      "enum": [
+                        "workitems"
+                      ],
+                      "type": "string"
+                    }
+                  },
+                  "type": "object"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "revision": {
+          "example": "1234",
+          "type": "string"
+        },
+        "type": {
+          "enum": [
+            "featureselections"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "included": {
+      "description": "Related entities might be returned, see <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20250606201928474.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a>.",
+      "items": {
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "links": {
+      "properties": {
+        "self": {
+          "example": "server-host-name/application-path/projects/MyProjectId/workitems/MyWorkItemId/featureselections/included/MyProjectId/MyWorkItemId?revision=1234",
+          "type": "string"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "type": "object"
+}

Changed2 schema fields changedSep 7, 2026

changedInput schema / properties / fields / description

Previous value: -"Filter returned resource fields. See <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20231017526942799.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a> for details."New value: +"Filter returned resource fields. See <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20250606201928474.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a> for details."

changedInput schema / properties / include / description

Previous value: -"Include related entities. See <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20231017526942799.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a> for details."New value: +"Include related entities. See <a href=\"https://docs.sw.siemens.com/en-US/doc/230235217/PL20250606201928474.polarion_help_sc.xid2134849/xid2134871\" target=\"_blank\">REST API User Guide</a> for details."

First observedv1.0.0Jun 13, 2026

TDQS

A4.2/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and cross-boundary behavior are covered. The description adds only cardinality and the sibling routing; it says nothing about failure modes for the composite key (e.g., what happens if the target work item doesn't match the selection type) or revision/fields interplay. Adequate but thin given the annotations carry the rest.

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?

Three short clauses, zero filler, and the cardinality constraint plus the sibling redirect are both front-loaded. Nothing could be removed without losing routing information.

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

Completeness4/5

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

An output schema exists and annotations cover the safety profile, so the description needn't explain returns. What's covered — cardinality and the batch alternative — is sufficient to select and call it, though the composite-key relationship between source and target identifiers is left entirely to the schema.

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%, so all nine parameters are already documented, including the five required composite identifiers. The description adds no meaning beyond the schema — notably it never explains how projectId/workItemId/selectionTypeId combine with targetProjectId/targetWorkItemId, which is the one thing prose could have clarified.

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

Purpose5/5

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

States a specific verb and resource ("Returns the specified Feature Selection") and immediately disambiguates scope with "Cardinality: targets a single item by ID." It also names the sibling that handles the other case, so an agent can distinguish it from getFeatureSelections without opening either schema.

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

Usage Guidelines5/5

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

Explicitly states when to use this tool (one item, addressed by ID) and when to use the alternative ("For the full collection or a batch, use `getFeatureSelections` instead"). The routing condition is unambiguous.

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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