Utility Tools (time, calc, random)

beginner 🤖 LLM-friendly 1 min · 235 words Updated: 2026-06-27 English

Public utility endpoints — server time, safe calculator, random value generator. No auth required.

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Utility Tools

The /tools endpoints are public utilities — no authentication required. They're useful for LLM agents that need server-side time, safe math, or random values.

GET /tools/time

Get the current server time, timezone, and UTC offset.

curl https://synapse.schaefer.zone/tools/time

Response:

{
  "time": "2026-06-27T14:30:00.000Z",
  "timezone": "Europe/Berlin",
  "offset": 120
}

Use case: LLM agents that need to know "what time is it now" for scheduling, timestamps, or relative date calculations.

GET /tools/calc

Safe calculator — arithmetic only, no eval(). Supports +, -, *, /, %, (, ), and numbers.

curl "https://synapse.schaefer.zone/tools/calc?expr=(10+5)*3"

Response:

{
  "result": 45,
  "expr": "(10+5)*3"
}

Use this instead of trying to do math in your head or via string parsing. It's safe (no code injection possible) and accurate.

Supported operators

+ addition
- subtraction
* multiplication
/ division
% modulo
( ) parentheses
Numbers (integers and decimals)

Examples

curl ".../tools/calc?expr=2+2"          # → 4
curl ".../tools/calc?expr=3.14*100"     # → 314
curl ".../tools/calc?expr=100%7"        # → 2
curl ".../tools/calc?expr=(2+3)*4-1"    # → 19

GET /tools/random

Generate random values.

# UUID v4
curl "https://synapse.schaefer.zone/tools/random?type=uuid"
# → { "value": "a1b2c3d4-...", "type": "uuid" }

# Integer (default range 0-100)
curl "https://synapse.schaefer.zone/tools/random?type=int&min=1&max=10"
# → { "value": 7, "type": "int" }

# Float
curl "https://synapse.schaefer.zone/tools/random?type=float&min=0&max=1"
# → { "value": 0.7234, "type": "float" }

# Hex string
curl "https://synapse.schaefer.zone/tools/random?type=hex&min=8&max=16"
# → { "value": "a3f7b2c1", "type": "hex" }

# Alphabetic string
curl "https://synapse.schaefer.zone/tools/random?type=alpha&min=8&max=12"
# → { "value": "kQmzPwXn", "type": "alpha" }

Type parameters

Type	Parameters	Output
`uuid`	none	UUID v4 string
`int`	`min`, `max` (default 0-100)	Integer
`float`	`min`, `max` (default 0-100)	Float
`hex`	`min`, `max` (length range, default 8-16)	Hex string
`alpha`	`min`, `max` (length range, default 8-16)	Alphabetic string

Use Cases for LLM Agents

Generate unique IDs

ID=$(curl -s .../tools/random?type=uuid | jq -r .value)
curl -X POST .../memory -d "{\"key\": \"task_$ID\", ...}"

Calculate percentages

TOTAL=142
DONE=87
PERCENT=$(curl -s ".../tools/calc?expr=($DONE*100)/$TOTAL" | jq -r .result)
echo "Progress: $PERCENT%"

Get current timestamp

NOW=$(curl -s .../tools/time | jq -r .time)
curl -X POST .../var -d "{\"key\": \"last_run\", \"value\": \"$NOW\"}"

Generate test data

for i in {1..10}; do
  NAME=$(curl -s ".../tools/random?type=alpha&min=5&max=10" | jq -r .value)
  curl -X POST .../memory -d "{\"key\": \"test_$i\", \"content\": \"$NAME\"}"
done

Next Steps

API Overview — all endpoint groups
Errors & Error Handling