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Semantic Cache MCP

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Stats

stats

Report cache health and runtime diagnostics, including storage occupancy, token savings, cache hit rates, per-tool call counts, and process memory. Use to measure or debug, not in read/edit loops.

Instructions

Report cache health, token savings, and runtime diagnostics.

Returns storage occupancy (files, tokens, documents, DB size), session and lifetime token savings and cache hit rates, per-tool call counts, and process memory. Use it to measure or debug — not as a routine step in read/edit loops. Takes no arguments.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.6.0
    • changedOutput schema / (root)
      Previous value: -{
-  "properties": {
-    "lifetime": {
-      "anyOf": [
-        {
-          "properties": {
-            "cache_hits": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Cache Hits"
-            },
-            "cache_misses": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Cache Misses"
-            },
-            "files_edited": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Edited"
-            },
-            "files_read": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Read"
-            },
-            "files_written": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Written"
-            },
-            "hit_rate_pct": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Hit Rate Pct"
-            },
-            "tokens_original": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tokens Original"
-            },
-            "tokens_returned": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tokens Returned"
-            },
-            "tokens_saved": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tokens Saved"
-            },
-            "total_sessions": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Total Sessions"
-            },
-            "truncated": {
-              "anyOf": [
-                {
-                  "type": "boolean"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Truncated"
-            }
-          },
-          "title": "StatsLifetime",
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "default": null
-    },
-    "mode": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "default": null,
-      "title": "Mode"
-    },
-    "process_rss_mb": {
-      "anyOf": [
-        {
-          "type": "number"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "default": null,
-      "title": "Process Rss Mb"
-    },
-    "session": {
-      "anyOf": [
-        {
-          "properties": {
-            "cache_hits": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Cache Hits"
-            },
-            "cache_misses": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Cache Misses"
-            },
-            "diffs_served": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Diffs Served"
-            },
-            "files_edited": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Edited"
-            },
-            "files_read": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Read"
-            },
-            "files_written": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Written"
-            },
-            "hit_rate_pct": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Hit Rate Pct"
-            },
-            "tokens_original": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tokens Original"
-            },
-            "tokens_returned": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tokens Returned"
-            },
-            "tokens_saved": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tokens Saved"
-            },
-            "tool_calls": {
-              "anyOf": [
-                {
-                  "additionalProperties": {
-                    "type": "integer"
-                  },
-                  "type": "object"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Tool Calls"
-            },
-            "truncated": {
-              "anyOf": [
-                {
-                  "type": "boolean"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Truncated"
-            },
-            "uptime_s": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Uptime S"
-            }
-          },
-          "title": "StatsSession",
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "default": null
-    },
-    "storage": {
-      "anyOf": [
-        {
-          "properties": {
-            "db_size_mb": {
-              "anyOf": [
-                {
-                  "type": "number"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Db Size Mb"
-            },
-            "files_cached": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Files Cached"
-            },
-            "total_documents": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Total Documents"
-            },
-            "total_tokens_cached": {
-              "anyOf": [
-                {
-                  "type": "integer"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Total Tokens Cached"
-            },
-            "truncated": {
-              "anyOf": [
-                {
-                  "type": "boolean"
-                },
-                {
-                  "type": "null"
-                }
-              ],
-              "default": null,
-              "title": "Truncated"
-            }
-          },
-          "title": "StatsStorage",
-          "type": "object"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "default": null
-    },
-    "truncated": {
-      "anyOf": [
-        {
-          "type": "boolean"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "default": null,
-      "title": "Truncated"
-    }
-  },
-  "title": "StatsResponse",
-  "type": "object"
-}New value: +null
  2. Changed2 schema fields changedv0.5.1
    • removedOutput schema / properties / embedding
      Removed value: -{
-  "anyOf": [
-    {
-      "properties": {
-        "model": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null,
-          "title": "Model"
-        },
-        "process_rss_mb": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null,
-          "title": "Process Rss Mb"
-        },
-        "provider": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null,
-          "title": "Provider"
-        },
-        "ready": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null,
-          "title": "Ready"
-        },
-        "truncated": {
-          "anyOf": [
-            {
-              "type": "boolean"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null,
-          "title": "Truncated"
-        }
-      },
-      "title": "StatsEmbedding",
-      "type": "object"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null
-}
    • addedOutput schema / properties / process_rss_mb
      Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Process Rss Mb"
+}
  3. Addedv0.4.5
  4. Removedv0.4.1
  5. First observedv0.4.1

TDQS

A4.7/5.0
Behavior4/5

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

With no annotations provided, the description carries the behavioral burden. It conveys a read-only, observational character through 'Report' and 'diagnostics,' and lists what the caller should expect. It does not explicitly state 'does not modify state,' but the reporting/diagnostic framing makes mutation unlikely.

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 purpose, followed by a useful enumerative detail list and a clear usage boundary. Every sentence earns its place, and no filler or redundancy is present.

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 zero-parameter diagnostic tool with no output schema, the description is complete: it names the full return categories, explains the tool's purpose, and gives usage boundaries. An agent has enough information to select and invoke this tool correctly.

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

Parameters4/5

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

The tool has zero parameters and the schema already reflects this with an empty properties object. The description reinforces this with 'Takes no arguments,' which is sufficient; there are no parameter semantics needing explanation.

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 opens with a specific verb and resource: 'Report cache health, token savings, and runtime diagnostics.' It then enumerates the exact outputs, making the tool's purpose concrete and distinguishably diagnostic relative to siblings like read, edit, and search.

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?

The description explicitly states when to use it: 'Use it to measure or debug' and equally explicitly when not to use it: 'not as a routine step in read/edit loops.' This gives clear, actionable usage guidance without requiring inference.

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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