PerfLens MCP Server

Overview Schema Source Related Servers Discussions Admin

analyze_profile

Idempotent

Analyze folded, perf-script, or perf.data Linux profile files and store the analysis as JSON for evidence-driven performance troubleshooting.

Instructions

Analyze an allowed folded, perf-script, or perf.data profile and store JSON.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`path`	Yes
`source_type`	No		auto

Output Schema

TableJSON Schema

Name	Required	Default
`uri`	Yes
`summary`	Yes
`artifact_id`	Yes
`artifact_type`	Yes
`schema_version`	No	1.0
`evidence_quality`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed12 schema fields changedv0.3.2Aug 28, 2026

addedOutput schema / $defs / EvidenceQuality / properties / kernel_context_self_percent

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Kernel Context Self Percent"
+}

addedOutput schema / $defs / EvidenceQuality / properties / kernel_context_self_weight

Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Kernel Context Self Weight"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unknown_context_self_percent

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unknown Context Self Percent"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unknown_context_self_weight

Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unknown Context Self Weight"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unresolved_kernel_self_percent

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unresolved Kernel Self Percent"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unresolved_kernel_self_weight

Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unresolved Kernel Self Weight"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unresolved_unknown_context_self_percent

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unresolved Unknown Context Self Percent"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unresolved_unknown_context_self_weight

Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unresolved Unknown Context Self Weight"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unresolved_user_self_percent

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unresolved User Self Percent"
+}

addedOutput schema / $defs / EvidenceQuality / properties / unresolved_user_self_weight

Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Unresolved User Self Weight"
+}

addedOutput schema / $defs / EvidenceQuality / properties / user_context_self_percent

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "User Context Self Percent"
+}

addedOutput schema / $defs / EvidenceQuality / properties / user_context_self_weight

Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "User Context Self Weight"
+}

Changed2 schema fields changedv0.3.0Aug 21, 2026

addedOutput schema / $defs

Added value: +{
+  "EvidenceQuality": {
+    "additionalProperties": false,
+    "properties": {
+      "actual_event_source": {
+        "default": "unknown",
+        "enum": [
+          "hardware",
+          "software",
+          "unknown"
+        ],
+        "title": "Actual Event Source",
+        "type": "string"
+      },
+      "address_annotation_line_count": {
+        "minimum": 0,
+        "title": "Address Annotation Line Count",
+        "type": "integer"
+      },
+      "aggregated_frame_occurrence_count": {
+        "minimum": 0,
+        "title": "Aggregated Frame Occurrence Count",
+        "type": "integer"
+      },
+      "allowed_conclusions": {
+        "default": [],
+        "items": {
+          "type": "string"
+        },
+        "title": "Allowed Conclusions",
+        "type": "array"
+      },
+      "call_graph_weight": {
+        "minimum": 0,
+        "title": "Call Graph Weight",
+        "type": "integer"
+      },
+      "call_graph_weight_percent": {
+        "maximum": 100,
+        "minimum": 0,
+        "title": "Call Graph Weight Percent",
+        "type": "number"
+      },
+      "collection_limitations": {
+        "default": [],
+        "items": {
+          "type": "string"
+        },
+        "title": "Collection Limitations",
+        "type": "array"
+      },
+      "duplicate_frame_line_count": {
+        "minimum": 0,
+        "title": "Duplicate Frame Line Count",
+        "type": "integer"
+      },
+      "event": {
+        "title": "Event",
+        "type": "string"
+      },
+      "exported_call_path_count": {
+        "minimum": 0,
+        "title": "Exported Call Path Count",
+        "type": "integer"
+      },
+      "exported_hotspot_count": {
+        "minimum": 0,
+        "title": "Exported Hotspot Count",
+        "type": "integer"
+      },
+      "fallback_reason": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "title": "Fallback Reason"
+      },
+      "fallback_used": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "title": "Fallback Used"
+      },
+      "forbidden_conclusions": {
+        "default": [],
+        "items": {
+          "type": "string"
+        },
+        "title": "Forbidden Conclusions",
+        "type": "array"
+      },
+      "frame_line_count": {
+        "minimum": 0,
+        "title": "Frame Line Count",
+        "type": "integer"
+      },
+      "inline_frame_count": {
+        "minimum": 0,
+        "title": "Inline Frame Count",
+        "type": "integer"
+      },
+      "input_bytes": {
+        "minimum": 0,
+        "title": "Input Bytes",
+        "type": "integer"
+      },
+      "input_sha256": {
+        "pattern": "^[a-f0-9]{64}$",
+        "title": "Input Sha256",
+        "type": "string"
+      },
+      "limitations": {
+        "default": [],
+        "items": {
+          "type": "string"
+        },
+        "title": "Limitations",
+        "type": "array"
+      },
+      "malformed_record_count": {
+        "minimum": 0,
+        "title": "Malformed Record Count",
+        "type": "integer"
+      },
+      "normalization_merge_count": {
+        "minimum": 0,
+        "title": "Normalization Merge Count",
+        "type": "integer"
+      },
+      "omitted_call_path_weight": {
+        "minimum": 0,
+        "title": "Omitted Call Path Weight",
+        "type": "integer"
+      },
+      "omitted_hotspot_self_weight": {
+        "minimum": 0,
+        "title": "Omitted Hotspot Self Weight",
+        "type": "integer"
+      },
+      "parser_invariants_passed": {
+        "title": "Parser Invariants Passed",
+        "type": "boolean"
+      },
+      "quality_status": {
+        "enum": [
+          "verified",
+          "partial"
+        ],
+        "title": "Quality Status",
+        "type": "string"
+      },
+      "sample_count": {
+        "minimum": 0,
+        "title": "Sample Count",
+        "type": "integer"
+      },
+      "schema_version": {
+        "const": "1.0",
+        "default": "1.0",
+        "title": "Schema Version",
+        "type": "string"
+      },
+      "source_annotation_line_count": {
+        "minimum": 0,
+        "title": "Source Annotation Line Count",
+        "type": "integer"
+      },
+      "source_collection_artifact_sha256": {
+        "anyOf": [
+          {
+            "pattern": "^[a-f0-9]{64}$",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "title": "Source Collection Artifact Sha256"
+      },
+      "source_collection_id": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "title": "Source Collection Id"
+      },
+      "source_line_frame_count": {
+        "minimum": 0,
+        "title": "Source Line Frame Count",
+        "type": "integer"
+      },
+      "source_line_self_percent": {
+        "maximum": 100,
+        "minimum": 0,
+        "title": "Source Line Self Percent",
+        "type": "number"
+      },
+      "source_line_self_weight": {
+        "minimum": 0,
+        "title": "Source Line Self Weight",
+        "type": "integer"
+      },
+      "source_locations_truncated_hotspot_count": {
+        "minimum": 0,
+        "title": "Source Locations Truncated Hotspot Count",
+        "type": "integer"
+      },
+      "total_call_path_count": {
+        "minimum": 0,
+        "title": "Total Call Path Count",
+        "type": "integer"
+      },
+      "total_hotspot_count": {
+        "minimum": 0,
+        "title": "Total Hotspot Count",
+        "type": "integer"
+      },
+      "total_weight": {
+        "minimum": 0,
+        "title": "Total Weight",
+        "type": "integer"
+      },
+      "unicode_replacement_count": {
+        "minimum": 0,
+        "title": "Unicode Replacement Count",
+        "type": "integer"
+      },
+      "unresolved_self_percent": {
+        "maximum": 100,
+        "minimum": 0,
+        "title": "Unresolved Self Percent",
+        "type": "number"
+      },
+      "unresolved_self_weight": {
+        "minimum": 0,
+        "title": "Unresolved Self Weight",
+        "type": "integer"
+      },
+      "warning_count": {
+        "minimum": 0,
+        "title": "Warning Count",
+        "type": "integer"
+      },
+      "warnings_truncated": {
+        "title": "Warnings Truncated",
+        "type": "boolean"
+      },
+      "weight_source": {
+        "title": "Weight Source",
+        "type": "string"
+      },
+      "weight_unit": {
+        "title": "Weight Unit",
+        "type": "string"
+      }
+    },
+    "required": [
+      "quality_status",
+      "parser_invariants_passed",
+      "input_sha256",
+      "input_bytes",
+      "sample_count",
+      "total_weight",
+      "event",
+      "weight_unit",
+      "weight_source",
+      "malformed_record_count",
+      "warning_count",
+      "warnings_truncated",
+      "unicode_replacement_count",
+      "frame_line_count",
+      "duplicate_frame_line_count",
+      "address_annotation_line_count",
+      "source_annotation_line_count",
+      "aggregated_frame_occurrence_count",
+      "unresolved_self_weight",
+      "unresolved_self_percent",
+      "call_graph_weight",
+      "call_graph_weight_percent",
+      "source_line_frame_count",
+      "source_line_self_weight",
+      "source_line_self_percent",
+      "inline_frame_count",
+      "normalization_merge_count",
+      "source_locations_truncated_hotspot_count",
+      "total_hotspot_count",
+      "exported_hotspot_count",
+      "omitted_hotspot_self_weight",
+      "total_call_path_count",
+      "exported_call_path_count",
+      "omitted_call_path_weight"
+    ],
+    "title": "EvidenceQuality",
+    "type": "object"
+  }
+}

addedOutput schema / properties / evidence_quality

Added value: +{
+  "anyOf": [
+    {
+      "$ref": "#/$defs/EvidenceQuality"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null
+}

First observedv0.1.0Aug 1, 2026

TDQS

C2.9/5.0

Behavior3/5

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

Annotations already convey idempotency and non-destructiveness. The description adds the side-effect of storing JSON output, but it does not explain what 'allowed' means, whether existing output is overwritten, or any permissions needed. This is a modest addition beyond annotations with no contradiction.

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

Conciseness4/5

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

The description is a single, front-loaded sentence with no filler. It earns its place, though 'allowed' is slightly ambiguous. Overall, concise and well structured.

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

Completeness2/5

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

The existing output schema partly relieves the need to describe return values, but the tool is left incomplete: no path semantics, no source_type behavior, no prerequisites, and no differentiation from analyze_collection. An agent given only this description would likely guess at required inputs.

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

Parameters2/5

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

With 0% schema description coverage, the description must explain both parameters. It partially enumerates the accepted profile kinds (folded, perf-script, perf.data), which maps to the source_type enum, but it never describes the required 'path' parameter or the 'auto' default. The hyphen/underscore mismatch between the description and the enum values further weakens clarity.

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 names a specific verb ('Analyze'), a resource ('folded, perf-script, or perf.data profile'), and an outcome ('store JSON'). It is clear enough to distinguish from collection or comparison tools, though it does not explicitly name a sibling alternative.

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

Usage Guidelines2/5

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

No when-to-use or when-not-to-use guidance is given. It does not distinguish this tool from closely related siblings such as analyze_collection, collect_profile, or compare_profiles, leaving the agent to infer when this specific analysis is appropriate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Deploy Server