Dev utilities belt

Hash, HMAC and checksum a payload, decode a JWT, convert bases and time zones, subnet a network, and budget a rate limit — the small tools every agent build leans on.

developer 29 items

2 MCP servers, 3 agent skills, 17 hosted tools, 7 workflows

In this collection

• Text Hash Digest (SHA / MD5)
  Real cryptographic hex digests of a UTF-8 string — sha256 by default, plus the full family.hosted tool
• HMAC Generator
  Compute an HMAC digest (SHA-256 by default) for a key–message pair.hosted tool
• CRC-32 / Adler-32 Checksum
  Compute a CRC-32 or Adler-32 checksum for an arbitrary text string.hosted tool
• Deterministic UUID (v5 / v3)
  Stable name-based UUID from a namespace and name — same inputs, same UUID (no randomness).hosted tool
• JWT Decoder (no signature verification)
  Decode a JWT's header and payload to JSON. Does NOT verify the signature — contents are unauthenticated.hosted tool
• Number Base Converter
  Convert an integer between bases 2-36, with binary/octal/decimal/hex forms.hosted tool
• Encoder / Decoder (base64 / url / hex)
  Reversibly encode or decode text between base64, base64url, URL-percent and hex.hosted tool
• Checksum Validator
  Validate or compute check digits for IBAN, ISBN-10, and ISBN-13 identifiers.hosted tool
• IPv4 Subnet / CIDR Calculator
  Network, broadcast, netmask, usable host range and counts for an IPv4 CIDR block.hosted tool
• Rate Limit Advisor
  Remaining capacity, wait time, and burst headroom for a sliding-window rate limit.hosted tool
• Retry Backoff Schedule
  Exponential backoff delays per attempt with optional jitter and per-attempt cap.hosted tool
• Text Case Converter
  Convert any identifier or sentence to snake_case, kebab-case, camelCase, PascalCase, CONSTANT_CASE, or Title Case.hosted tool
• Text Statistics Analyzer
  Word count, sentence count, character count, average word length, and readability metrics for any text.hosted tool
• Levenshtein Edit Distance
  Exact edit distance and 0..1 similarity between two strings.hosted tool
• Time Zone Converter
  Convert an ISO datetime between IANA time zones with correct DST offsets.hosted tool
• Cron Next Run Times
  Next fire times of a 5-field cron expression after a base time.hosted tool
• LLM Token & API Cost Estimator
  Estimate token count from text (or pass exact counts) and compute API cost at per-million prices.hosted tool
• MCP Server Builder
  Scaffolds well-designed Model Context Protocol servers in Python (FastMCP) or Node/TypeScript so LLMs can call external services through clean tools.agent skill
• MCP CLI
  Drives MCP servers from the command line for manual testing and debugging.agent skill
• Using Git Worktrees
  Sets up an isolated git worktree, picking a sane directory and checking it's safe, before starting new feature work.agent skill
• io.github.buildkite/buildkite-mcp-server
  MCP server exposing Buildkite API data (pipelines, builds, jobs, tests) to AI tooling and editors.MCP server
• io.github.configcat/mcp-server
  Enables AI agents to interact with ConfigCat, a feature flag service for teams.MCP server
• Analyze text and normalize its case
  Check word count and reading time for a block of text, normalize its casing, then compare it to a reference string with edit distance.workflow
• Convert and checksum a batch of identifiers
  Generate deterministic UUIDs for a batch of records, CRC-32 checksum them, then Luhn-validate any card-like numbers involved.workflow
• Convert time zones and schedule a cron job
  Convert a target local time into UTC, get its Unix epoch value, then compute the matching cron schedule.workflow
• Decode a JWT and check rate limits
  Decode an incoming JWT to inspect its claims, check the current rate-limit budget, then plan the retry backoff if it's exceeded.workflow
• Plan a cron schedule and estimate token cost
  Compute the next run times for a cron expression, estimate the LLM token cost per run, then count business days between runs.workflow
• Subnet a network and check uptime budget
  Carve a subnet from a CIDR block, check the uptime/downtime budget for an SLA, then estimate the data-transfer time for a backup.workflow
• Validate and hash an API payload
  Hash a payload for integrity, sign it with HMAC, then checksum the final wire format before sending.workflow