Agent Margin Router

Reddit Search

reddit_search

Read-only

Search Reddit posts site-wide or within one subreddit: title, URL, subreddit, author, score, upvote ratio, comment count, timestamp and the first 500 characters of the post text; sort by relevance, hot, new, top or comments with a time filter. Pay per call with USDC or USDT on Base via x402. 3 free calls per wallet.

Input Schema

TableJSON Schema

Name	Required	Description
`sort`	No	relevance (default), hot, new, top, comments.
`query`	Yes	Search phrase.
`wallet`	No	Your EVM wallet address (0x...). Unlocks the free tier (3 free calls per wallet).
`api_key`	No	Optional AMR enterprise API key.
`subreddit`	No	Restrict to one subreddit, e.g. ethereum.
`x_payment`	No	Optional signed x402 payment payload (base64 JSON) for USDC/USDT on Base.
`max_results`	No	1-50 (default 10).
`time_filter`	No	hour, day, week, month, year, all (default).

Output Schema

TableJSON Schema

Name	Required	Description	Default
`sort`	Yes
`posts`	Yes
`query`	Yes
`token`	No	Token actually used for payment (USDC, USDT or FREE).	USDC
`source`	Yes
`routing`	Yes	How the request was routed (provider, fallback, cache, latency).
`cost_usdc`	Yes	Price charged in stablecoin units (USDC/USDT 1:1); 0 on the free tier.
`subreddit`	No
`fetched_at`	No	UTC timestamp when the data was fetched.
`post_count`	Yes
`freshness_seconds`	Yes	Age of the underlying data in seconds (0 = fetched live).
`x_payment_response`	No	Base64-encoded x402 settlement receipt (mirrors the X-PAYMENT-RESPONSE header). Only present when the call was paid with `x_payment`.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 15, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "description": "Response for ``POST /reddit-search``.",
+  "properties": {
+    "cost_usdc": {
+      "description": "Price charged in stablecoin units (USDC/USDT 1:1); 0 on the free tier.",
+      "title": "Cost Usdc",
+      "type": "number"
+    },
+    "fetched_at": {
+      "description": "UTC timestamp when the data was fetched.",
+      "format": "date-time",
+      "title": "Fetched At",
+      "type": "string"
+    },
+    "freshness_seconds": {
+      "description": "Age of the underlying data in seconds (0 = fetched live).",
+      "title": "Freshness Seconds",
+      "type": "integer"
+    },
+    "post_count": {
+      "title": "Post Count",
+      "type": "integer"
+    },
+    "posts": {
+      "items": {
+        "properties": {
+          "author": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null,
+            "title": "Author"
+          },
+          "created_at": {
+            "title": "Created At",
+            "type": "string"
+          },
+          "created_utc": {
+            "title": "Created Utc",
+            "type": "integer"
+          },
+          "flair": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null,
+            "title": "Flair"
+          },
+          "id": {
+            "title": "Id",
+            "type": "string"
+          },
+          "is_self": {
+            "title": "Is Self",
+            "type": "boolean"
+          },
+          "num_comments": {
+            "title": "Num Comments",
+            "type": "integer"
+          },
+          "over_18": {
+            "default": false,
+            "title": "Over 18",
+            "type": "boolean"
+          },
+          "permalink": {
+            "title": "Permalink",
+            "type": "string"
+          },
+          "score": {
+            "title": "Score",
+            "type": "integer"
+          },
+          "selftext": {
+            "title": "Selftext",
+            "type": "string"
+          },
+          "subreddit": {
+            "title": "Subreddit",
+            "type": "string"
+          },
+          "title": {
+            "title": "Title",
+            "type": "string"
+          },
+          "upvote_ratio": {
+            "anyOf": [
+              {
+                "type": "number"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "default": null,
+            "title": "Upvote Ratio"
+          },
+          "url": {
+            "title": "Url",
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "title",
+          "url",
+          "permalink",
+          "subreddit",
+          "score",
+          "num_comments",
+          "created_utc",
+          "created_at",
+          "selftext",
+          "is_self"
+        ],
+        "title": "RedditPost",
+        "type": "object"
+      },
+      "title": "Posts",
+      "type": "array"
+    },
+    "query": {
+      "title": "Query",
+      "type": "string"
+    },
+    "routing": {
+      "description": "How the request was routed (provider, fallback, cache, latency).",
+      "properties": {
+        "cache_hit": {
+          "default": false,
+          "description": "True if the result was served from cache.",
+          "title": "Cache Hit",
+          "type": "boolean"
+        },
+        "fallback_used": {
+          "default": false,
+          "description": "True if the primary provider failed and a fallback served the result.",
+          "title": "Fallback Used",
+          "type": "boolean"
+        },
+        "latency_ms": {
+          "default": 0,
+          "description": "End-to-end routing latency in milliseconds.",
+          "title": "Latency Ms",
+          "type": "integer"
+        },
+        "provider": {
+          "description": "Name of the upstream provider that served the result.",
+          "title": "Provider",
+          "type": "string"
+        },
+        "providers_tried": {
+          "description": "Providers attempted, in order.",
+          "items": {
+            "type": "string"
+          },
+          "title": "Providers Tried",
+          "type": "array"
+        }
+      },
+      "required": [
+        "provider"
+      ],
+      "title": "RoutingMeta",
+      "type": "object"
+    },
+    "sort": {
+      "title": "Sort",
+      "type": "string"
+    },
+    "source": {
+      "title": "Source",
+      "type": "string"
+    },
+    "subreddit": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null,
+      "title": "Subreddit"
+    },
+    "token": {
+      "default": "USDC",
+      "description": "Token actually used for payment (USDC, USDT or FREE).",
+      "title": "Token",
+      "type": "string"
+    },
+    "x_payment_response": {
+      "description": "Base64-encoded x402 settlement receipt (mirrors the X-PAYMENT-RESPONSE header). Only present when the call was paid with `x_payment`.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "freshness_seconds",
+    "cost_usdc",
+    "routing",
+    "query",
+    "sort",
+    "posts",
+    "post_count",
+    "source"
+  ],
+  "type": "object"
+}

Changed4 schema fields changedSep 13, 2026
- addedInput schema / properties / max_results / default
```
Added value: +10
```
- addedInput schema / properties / max_results / maximum
```
Added value: +50
```
- addedInput schema / properties / max_results / minimum
```
Added value: +1
```
- changedInput schema / properties / wallet / description
```
Previous value: -"Your EVM wallet address (0x...). Unlocks the free tier (3 calls per wallet)."New value: +"Your EVM wallet address (0x...). Unlocks the free tier (3 free calls per wallet)."
```
AddedSep 13, 2026

TDQS

A3.9/5.0

Behavior4/5

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

The annotations already mark this as read-only, and the description adds meaningful behavioral context: it returns the first 500 characters of post text, supports site-wide or subreddit-scoped queries, includes sort and time-filter options, and discloses the payment model via x402 with 3 free calls per wallet. This goes well beyond what the annotations alone provide.

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 appropriately sized and front-loads the core purpose before payment details. The first sentence is dense but every clause adds value, and there is no filler or redundant phrasing. It could be slightly more structured, but it remains concise and readable.

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?

The description covers scope, returned fields, filtering, sorting, and payment/free-tier behavior, which is strong given the output schema and 100% parameter documentation. It does not walk through how to construct the x402 payment payload or handle authentication edge cases, but those are covered by the schema and optional fields.

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 the input schema already documents all 8 parameters. The description reinforces the meaning of sort, subreddit, time_filter, and payment-related fields, but it does not add substantial new semantic detail beyond what the schema already states, so it meets the baseline.

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 verb and resource: 'Search Reddit posts site-wide or within one subreddit', and enumerates the returned fields (title, URL, author, score, comment count, etc.), which clearly distinguishes it from sibling search tools like web_search or hn_search. It leaves no ambiguity about what resource this tool acts on.

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?

The description implies the tool is for searching Reddit content, but it does not explicitly state when to prefer it over alternatives like web_search, hn_search, or other search siblings, nor does it mention when not to use it. The usage context is clear but unstated, so the guidance is implied rather than explicit.

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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