Synthex Forge — x402 Paid Agent Services

Assess Spend Anomaly

assess_spend_anomaly

Read-onlyIdempotent

Judge whether the spend is normal. use it rather than assess_mandate_compliance for spend anomaly, not mandate compliance; an object with 53 fields including agentId, agent_id. $0.05 USDC.

Input Schema

Name	Required	Description
`agent_id`	No	The identifier of the agent the operation concerns.
`baseline`	No	The baseline this operation operates on. See the schema for its type and whether it is required.
`spend_window`	No	The spend window this operation operates on. See the schema for its type and whether it is required.

Output Schema

Name	Required	Description
`ts`	No	The `ts` field of the response.
`llm`	No	The `llm` field of the response.
`kind`	No	The `kind` field of the response.
`note`	No	A note on how the answer was produced.
`test`	No	The `test` field of the response.
`clock`	No	The `clock` field of the response.
`index`	No	The `index` field of the response.
`share`	No	The `share` field of the response.
`amount`	No	The `amount` field of the response.
`events`	No	The `events` field of the response.
`key_id`	No	The `key_id` field of the response.
`zScore`	No	The `zScore` field of the response.
`agentId`	No	The `agentId` field of the response.
`drivers`	No	The `drivers` field of the response.
`formula`	No	The `formula` field of the response.
`profile`	No	The `profile` field of the response.
`verdict`	Yes	The decision this tool returned.
`z_score`	No	The `z_score` field of the response.
`agent_id`	No	The `agent_id` field of the response.
`elevated`	No	The `elevated` field of the response.
`verdicts`	No	The `verdicts` field of the response.
`anomalous`	No	The `anomalous` field of the response.
`signature`	Yes	The Ed25519 signature over the evidence core, base64-encoded.
`signed_by`	No	The key id that signed the answer.
`amount_usd`	No	The amount the operation concerned.
`public_key`	No	The `public_key` field of the response.
`thresholds`	No	The `thresholds` field of the response.
`event_count`	No	The `event_count` field of the response.
`methodology`	No	The `methodology` field of the response.
`windowHours`	No	The `windowHours` field of the response.
`window_rule`	No	The `window_rule` field of the response.
`counterparty`	No	The `counterparty` field of the response.
`coverageGaps`	No	The `coverageGaps` field of the response.
`window_hours`	No	The `window_hours` field of the response.
`coverage_gaps`	No	The `coverage_gaps` field of the response.
`evidence_core`	Yes	The canonical, signed core of the answer — the payload the signature covers.
`output_sha256`	Yes	SHA-256 hex digest of the canonical evidence core.
`missing_fields`	No	The `missing_fields` field of the response.
`profileVersion`	No	Version of the answer profile.
`observedPerHour`	No	The `observedPerHour` field of the response.
`profile_version`	No	Version of the answer profile.
`total_spend_usd`	No	The `total_spend_usd` field of the response.
`canonicalization`	No	The canonicalisation rule the digest was computed under.
`observed_per_hour`	No	The `observed_per_hour` field of the response.
`methodologyVersion`	No	The `methodologyVersion` field of the response.
`methodology_version`	No	Version of the method that produced the answer.
`signature_algorithm`	No	The `signature_algorithm` field of the response.
`baselineObservations`	No	The `baselineObservations` field of the response.
`derived_window_hours`	No	The `derived_window_hours` field of the response.
`baseline_observations`	No	The `baseline_observations` field of the response.
`baseline_std_per_hour`	No	The `baseline_std_per_hour` field of the response.
`baseline_mean_per_hour`	No	The `baseline_mean_per_hour` field of the response.
`min_baseline_observations`	No	The `min_baseline_observations` field of the response.

Schema Changelog

Changes observed during successful MCP inspections.

Changed55 schema fields changedOct 31, 2026

addedOutput schema / properties / agentId

Added value: +{
+  "description": "The `agentId` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / agent_id

Added value: +{
+  "description": "The `agent_id` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / amount

Added value: +{
+  "description": "The `amount` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / amount_usd

Added value: +{
+  "description": "The amount the operation concerned.",
+  "type": "number"
+}

addedOutput schema / properties / anomalous

Added value: +{
+  "description": "The `anomalous` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / baselineObservations

Added value: +{
+  "description": "The `baselineObservations` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / baseline_mean_per_hour

Added value: +{
+  "description": "The `baseline_mean_per_hour` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / baseline_observations

Added value: +{
+  "description": "The `baseline_observations` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / baseline_std_per_hour

Added value: +{
+  "description": "The `baseline_std_per_hour` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / canonicalization

Added value: +{
+  "description": "The canonicalisation rule the digest was computed under.",
+  "type": "string"
+}

addedOutput schema / properties / clock

Added value: +{
+  "description": "The `clock` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / counterparty

Added value: +{
+  "description": "The `counterparty` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / coverageGaps

Added value: +{
+  "description": "The `coverageGaps` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / coverage_gaps

Added value: +{
+  "description": "The `coverage_gaps` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / derived_window_hours

Added value: +{
+  "description": "The `derived_window_hours` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / drivers

Added value: +{
+  "description": "The `drivers` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / elevated

Added value: +{
+  "description": "The `elevated` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / event_count

Added value: +{
+  "description": "The `event_count` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / events

Added value: +{
+  "description": "The `events` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / evidence_core

Added value: +{
+  "description": "The canonical, signed core of the answer — the payload the signature covers.",
+  "type": "object"
+}

addedOutput schema / properties / formula

Added value: +{
+  "description": "The `formula` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / index

Added value: +{
+  "description": "The `index` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / key_id

Added value: +{
+  "description": "The `key_id` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / kind

Added value: +{
+  "description": "The `kind` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / llm

Added value: +{
+  "description": "The `llm` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / methodology

Added value: +{
+  "description": "The `methodology` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / methodologyVersion

Added value: +{
+  "description": "The `methodologyVersion` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / methodology_version

Added value: +{
+  "description": "Version of the method that produced the answer.",
+  "type": "string"
+}

addedOutput schema / properties / min_baseline_observations

Added value: +{
+  "description": "The `min_baseline_observations` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / missing_fields

Added value: +{
+  "description": "The `missing_fields` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / note

Added value: +{
+  "description": "A note on how the answer was produced.",
+  "type": "string"
+}

addedOutput schema / properties / observedPerHour

Added value: +{
+  "description": "The `observedPerHour` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / observed_per_hour

Added value: +{
+  "description": "The `observed_per_hour` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / output_sha256

Added value: +{
+  "description": "SHA-256 hex digest of the canonical evidence core.",
+  "type": "string"
+}

addedOutput schema / properties / profile

Added value: +{
+  "description": "The `profile` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / profileVersion

Added value: +{
+  "description": "Version of the answer profile.",
+  "type": "string"
+}

addedOutput schema / properties / profile_version

Added value: +{
+  "description": "Version of the answer profile.",
+  "type": "string"
+}

addedOutput schema / properties / public_key

Added value: +{
+  "description": "The `public_key` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / share

Added value: +{
+  "description": "The `share` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / signature

Added value: +{
+  "description": "The Ed25519 signature over the evidence core, base64-encoded.",
+  "type": "string"
+}

addedOutput schema / properties / signature_algorithm

Added value: +{
+  "description": "The `signature_algorithm` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / signed_by

Added value: +{
+  "description": "The key id that signed the answer.",
+  "type": "string"
+}

removedOutput schema / properties / status

Removed value: -{
-  "type": "string"
-}

addedOutput schema / properties / test

Added value: +{
+  "description": "The `test` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / thresholds

Added value: +{
+  "description": "The `thresholds` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / total_spend_usd

Added value: +{
+  "description": "The `total_spend_usd` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / ts

Added value: +{
+  "description": "The `ts` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / verdict

Added value: +{
+  "description": "The decision this tool returned.",
+  "type": "string"
+}

addedOutput schema / properties / verdicts

Added value: +{
+  "description": "The `verdicts` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / windowHours

Added value: +{
+  "description": "The `windowHours` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / window_hours

Added value: +{
+  "description": "The `window_hours` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / window_rule

Added value: +{
+  "description": "The `window_rule` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / zScore

Added value: +{
+  "description": "The `zScore` field of the response.",
+  "type": "object"
+}

addedOutput schema / properties / z_score

Added value: +{
+  "description": "The `z_score` field of the response.",
+  "type": "object"
+}

addedOutput schema / required

Added value: +[
+  "evidence_core",
+  "output_sha256",
+  "signature",
+  "verdict"
+]

AddedOct 31, 2026

TDQS

B3.4/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds a real behavioral fact not in the structured data — the $0.05 USDC cost — but the 'object with 53 fields including agentId, agent_id' fragment is opaque and adds no usable behavior context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The intent is front-loaded in the first clause, but roughly a third of the text is a broken fragment ('an object with 53 fields including agentId, agent_id') that duplicates the same field name in two casings and contradicts the presence of an output schema. Size is fine; the content is not clean.

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?

Read-only judgment tool with an output schema and full parameter coverage, so return values need not be explained. However, nothing says how the verdict is derived from `baseline` versus `spend_window`, and the stray '53 fields' claim may mislead about the return payload the output schema already defines.

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 `agent_id`, `baseline` and `spend_window` are already documented. The description contributes nothing about what a baseline must contain or how the spend window is evaluated, so it sits at the baseline 3 rather than above it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Judge whether the spend is normal') and explicitly separates itself from the `assess_mandate_compliance` sibling. The word 'normal' is left undefined and the surrounding fragments are ungrammatical, but an agent can still tell what domain the tool covers.

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?

Explicitly names the alternative to avoid ('use it rather than `assess_mandate_compliance` for spend anomaly, not mandate compliance'), which is exactly the routing signal an agent needs among ~140 siblings. It stops short of describing prerequisites or when a verdict is inconclusive, but the key exclusion is stated.

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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