[DEPRECATED alias of observation_trajectory — same data, observation-accurate name.] Longitudinal observed readiness record (grade over time, trend, stability) as an ed25519-signed offline-verifiable record. Measurement only — not a trust/safety verdict.
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | The MCP server endpoint URL (https) to look up the observation history for |
Changes observed during successful MCP inspections.
Input schema / $schemaPrevious value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"Input schema / properties / url / descriptionPrevious value: -"The MCP server endpoint URL (https) to look up the trajectory for"New value: +"The MCP server endpoint URL (https) to look up the observation history for"Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond annotations (readOnlyHint=true), the description reveals the data format (ed25519-signed, offline-verifiable) and emphasizes it is purely a measurement record, not a verdict. No contradictions with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description consists of two concise sentences: the first immediately flags deprecation and alias, the second details the output. Every sentence adds value, zero fluff, and important information is front-loaded.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple tool with one parameter and no output schema, the description sufficiently covers what the tool returns (longitudinal data, signed, offline-verifiable) and clarifies it is not a verdict. No critical gaps.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% (only the 'url' parameter with a clear description). The tool description adds no additional meaning beyond what the schema already provides, so baseline score of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool retrieves a longitudinal observed readiness record (grade over time, trend, stability) as an ed25519-signed offline-verifiable record. It also explicitly notes it is a deprecated alias of observation_trajectory, distinguishing it from siblings like trust_compare or trust_movers.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly names the preferred alternative (observation_trajectory) and clarifies it is a measurement-only tool, not a trust/safety verdict. This provides clear guidance on when to use this tool vs alternatives.
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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