PerfLens MCP Server

Overview Schema Source Related Servers Discussions Admin

collect_project_workload

Destructive

Executes a specified project binary with explicit authorization and collects performance metrics such as cycles, instructions, cache misses, and off-CPU activity for analysis.

Instructions

Run one explicitly authorized executable inside a project as the MCP user, bind its exact PID incarnation, and collect it through the restricted Collector broker. After the user approves the exact scope, authorization must be exactly I_EXPLICITLY_AUTHORIZE_PROJECT_EXECUTION; do not substitute manual PID attachment.

Input Schema

TableJSON Schema

Name	Required	Default
`mode`	No	record
`events`	No
`arguments`	No
`call_graph`	No	dwarf
`executable`	Yes
`event_source`	No	auto
`frequency_hz`	No
`project_root`	Yes
`authorization`	Yes
`duration_seconds`	No
`max_output_bytes`	No

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"
+}

Changed5 schema fields changedv0.3.0Aug 21, 2026

addedInput schema / properties / authorization / const

Added value: +"I_EXPLICITLY_AUTHORIZE_PROJECT_EXECUTION"

addedInput schema / properties / event_source

Added value: +{
+  "default": "auto",
+  "enum": [
+    "auto",
+    "hardware_required",
+    "software_only"
+  ],
+  "title": "Event Source",
+  "type": "string"
+}

changedInput schema / properties / events / default

Previous value: -[
-  "cycles",
-  "instructions",
-  "cache-references",
-  "cache-misses",
-  "branches",
-  "branch-misses",
-  "context-switches",
-  "cpu-migrations",
-  "page-faults"
-]New value: +[
+  "cycles",
+  "instructions",
+  "cache-references",
+  "cache-misses",
+  "branches",
+  "branch-misses"
+]

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
+}

Changed1 schema field changedv0.2.0Aug 7, 2026
- changedInput schema / properties / max_output_bytes / default
```
Previous value: -1073741824New value: +268435456
```
Addedv0.1.1Aug 5, 2026

TDQS

A4/5.0

Behavior4/5

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

The description adds meaningful behavioral context beyond the destructiveHint annotation: it actually runs an executable, binds to a specific PID incarnation, routes collection through a restricted broker, and demands exact authorization. The warning against substituting manual PID attachment is especially useful for safe invocation.

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 compact and front-loaded with the core action. Both sentences earn their place: the first states what the tool does, and the second enforces the mandatory authorization contract. There is no filler.

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

Completeness3/5

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

The description covers the critical safety context and the required authorization flow, and an output schema exists to describe return values. However, with 11 parameters, destructive behavior, and zero parameter-level schema documentation, the definition is not fully self-sufficient for an agent to invoke it correctly in varied scenarios.

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?

Schema description coverage is 0%, so the description must carry the burden of explaining 11 parameters. It only addresses authorization, executable, project root, and PID attachment. The many tuning parameters (mode, events, call_graph, event_source, frequency_hz, duration_seconds, max_output_bytes) are left entirely unexplained.

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?

The description states a specific action: run one explicitly authorized executable in a project, bind its exact PID incarnation, and collect it through the restricted Collector broker. This clearly distinguishes it from sibling Docker-focused collection tools and makes the tool's scope obvious.

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

Usage Guidelines4/5

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

The description gives clear context: the tool should be used after the user approves the exact execution scope, and it must use the exact authorization constant. It does not explicitly name alternatives or say when not to use it, but the 'inside a project' framing and authorization requirement provide strong situational guidance.

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

Deploy Server