thistripbtw-mcp

add_to_kept_trip

Add a stop to a kept trip using its #k= edit phrase, on the person's behalf. Writes exactly one stop and returns the trip's updated stop count.

Instructions

Add a stop to a trip the person has KEPT (a link with #k=), on their behalf. Use when they say 'add X to the trip', 'we're stopping at Y on the way', 'put the hotel on it'. Needs their EDIT phrase — a view phrase can read but not write, and the tool says so. Writes exactly one stop and returns the trip's current stop count. Like read_kept_trip this touches the network: the #k= phrase is the password and it goes to thistripbtw.us over TLS, nothing is stored about you, and a wrong phrase counts as a guess. Treat the link as a credential.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`link`	Yes	The kept trip's link with its #k= EDIT phrase.
`stop`	Yes	The stop to add.

Output Schema

TableJSON Schema

Name	Required	Description
`id`	No	The new stop's id, when the server returned one.
`stops`	Yes	How many stops the trip has now.
`summary`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv1.3.5Sep 30, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "id": {
+      "description": "The new stop's id, when the server returned one.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "stops": {
+      "description": "How many stops the trip has now.",
+      "type": "integer"
+    },
+    "summary": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "stops"
+  ],
+  "type": "object"
+}

Addedv1.0.2Sep 12, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Beyond the annotations, the description discloses the exact side effect ('Writes exactly one stop'), the return value, the network interaction with TLS, the no-storage guarantee, the guess-counting behavior for wrong phrases, and instructs treating the link as a credential. This is far richer than readOnlyHint=false and openWorldHint=true alone.

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?

Every sentence earns its place: purpose, trigger examples, prerequisite, side effect, network/security behavior, and credential warning. The most important information is front-loaded and there is no repetition of schema content or filler.

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?

Given the nested stop object, six optional/property fields, external network dependency, credential handling, and output schema context, the description covers everything an agent needs to invoke it correctly: when to use it, what it writes, what it returns, and the security implications. No critical guidance appears missing.

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?

Schema description coverage is 100%, so the schema already explains every parameter. The description adds important semantic weight to `link` by calling the #k= phrase a password and a credential, and clarifies that exactly one stop is written; this justifies a small bonus above the baseline of 3.

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 first sentence states precisely what the tool does: add a stop to a kept trip on the person's behalf, and distinguishes it from read/build/amend siblings by targeting only kept links with #k=. This gives an agent a clear, non-tautological purpose.

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 explicit user trigger phrases ('add X to the trip', 'we're stopping at Y on the way', 'put the hotel on it') and a clear precondition: the EDIT phrase, since a view phrase can read but not write. It does not explicitly name an alternative for view-only or non-kept trips, so it falls just short of full exclusion guidance.

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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