Penny Rounding
com.gumballtools/penny-rounding
MCP Bill of Materials
A machine-readable inventory of what this server exposes and depends on: tools with their effects, transports, packages, findings and provenance (schema version 1.0). Third-party text in it is escaped. Also available from the REST API at /api/v1/servers/b7231db0-35ff-49ed-922b-b41ec3c44bc4/mcbom.
MCP Bill of Materials
root{21}
schema_version: "1.0"
bom_format: "squatch-mcbom"
generator{3}
name: "squatch-mcp"
classifier_version: "rules_v1@2026-10-11.1"
unicode_version: "18.0.0"
server{7}
name: "com.gumballtools/penny-rounding"
title: "Penny Rounding"
description: "Round cash totals to the nearest nickel correctly — after tax, on the total, cash only."
version: "0.1.0"
homepage_url: "https://penny-rounding.gumballtools.com"
source: "official_registry"
upstream_status: "active"
publisher{4}
namespace: "com.gumballtools"
display_name: "com.gumballtools"
type: "registry_namespace"
status: "unclaimed"
organization: null
repository{5}
url: "https://github.com/bwalvoord/gumball"
provider: "github"
owner: "bwalvoord"
name: "gumball"
verified: false
packages[0]
transports[1]
0{5}
kind: "remote"
type: "streamable-http"
endpoint_url: "https://penny-rounding.gumballtools.com/api/mcp"
endpoint_host: "penny-rounding.gumballtools.com"
auth_type: "none"
auth{3}
type: "none"
authorization_servers[0]
scopes[0]
protocol{4}
era: "modern"
negotiated_version: "2026-07-28"
supported_versions[0]
transport_type: "streamable-http"
tools[3]
0{9}
name: "price_band"
title: "Which nearby list prices settle to the same cash total"
effect: "READ"
effect_confidence: 0.682
capabilities[2]
0{2}
capability: "LOCATION"
confidence: 0.61
1{2}
capability: "PAYMENT"
confidence: 0.724
risk_severity: "LOW"
fingerprint: "c30eb4300547ae34b57c817e55d68401824d10343864d38c36d2a0d8d9f38fa7"
input_schema_fingerprint: "2a41eefe53fdc6011d014b1822f4be09c045dfa5863798b413cbb4c306fa3bb4"
annotations{5}
title: null
readOnlyHint: true
destructiveHint: null
idempotentHint: null
openWorldHint: false
1{9}
name: "round_cash_total"
title: "Round a cash total the way the post-penny rules actually work"
effect: "READ"
effect_confidence: 0.32
capabilities[1]
0{2}
capability: "PAYMENT"
confidence: 0.741
risk_severity: "LOW"
fingerprint: "3f0a5e1b1bab1c3b77a276d8643dd7070e79025abbf0471ca3f3934985eb97d1"
input_schema_fingerprint: "7a1ccc589408448be3ab3920c652ed2dd2f6a63fea11f9ffca7e0a2196f96dfc"
annotations{5}
title: null
readOnlyHint: true
destructiveHint: null
idempotentHint: null
openWorldHint: false
2{9}
name: "rounding_impact"
title: "What cash rounding is actually worth across a price list"
effect: "READ"
effect_confidence: 0.682
capabilities[0]
risk_severity: "INFO"
fingerprint: "4f46ec78913711673c4f285817a424dc2bc1af13f9c1d6d76d20b2068ed9669e"
input_schema_fingerprint: "67663fbf1bf3b1272232c82e122541dcd02808c74f461b6807e833959bc41c63"
annotations{5}
title: null
readOnlyHint: true
destructiveHint: null
idempotentHint: null
openWorldHint: false
resources[0]
prompts[0]
extensions[0]
data{6}
privacy_completeness: "not_provided"
data_categories[0]
ai_training: null
retention_policy: null
processing_regions[0]
subprocessors[0]
external_integrations[1]
0{3}
host: "penny-rounding.gumballtools.com"
registrable_domain: "gumballtools.com"
source: "transport"
findings[1]
0{6}
check_id: "SQ-TOOL-CONCEALMENT"
category: "prompt_injection"
severity: "HIGH"
title: "Text asks the AI model to hide actions from the user"
subject_type: "tool"
subject_name: "round_cash_total"
trust{9}
registry_namespace: "verified_upstream"
publisher_identity: "unverified"
organization: "unverified"
domain: "unverified"
repository: "unverified"
source_provenance: "unknown"
security_scan: "findings_detected"
privacy_transparency: "not_provided"
monitoring: "active"
provenance{4}
registry_name: "com.gumballtools/penny-rounding"
registry_content_sha256: "6e46f0309435bca5b5bbc7e9a6b75a062fd2a50a5fd9fb484721bb397b11d7ed"
scan_snapshot_fingerprint: "3dd70af8f6a44231054668a9fe76dc3cf4ba050ffce7e3556424126c68d2bc0f"
scanner_version: "1.0.0"
timestamps{4}
generated_at: "2026-11-15T05:15:40.405Z"
observed_at: "2026-11-14T06:25:29.862+00:00"
registry_published_at: "2026-09-05T20:40:52.807011+00:00"
registry_updated_at: null