io.github.physics-star-cat/databutler-stats

by physics-star-cat · remote · no sign-in to list tools · v1.0.0 · published by GitHub user physics-star-cat

Exact statistics & probability: distributions, hypothesis tests, CIs, Bayesian updates, regression.

Changes · 6

Compare Registry entry

6 tools: 6 change things.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things6Claude Code: ask: see these tools
Only reads0Claude Code: allow

3 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http databutler-stats https://databutler.dev/api/mcp/stats

Findings

Matches of fixed checks, with the text they matched.

3 warn

Warndistribution
The server marks "distribution" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "evaluate": a word for a change.
What this check looks for
Warnhypothesis_test
The server marks "hypothesis_test" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "run": a word for a change.
What this check looks for
Warnbayes_update
The server marks "bayes_update" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "bayes_update" says "update": a word for a change.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

6 tools

Changes things 6Creates or changes something that can be changed back.Claude Code: ask

bayes_updateDiscrete Bayesian update: given competing hypotheses each with a prior and the likelihood of the observed evidence, return normalised posteriors.1 finding
Why it is in this group
- The name "bayes_update" says "update": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "bayes_update" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "bayes_update" says "update": a word for a change.
  What this check looks for
Description, as the server wrote it
Discrete Bayesian update: given competing hypotheses each with a prior and the likelihood of the observed evidence, return normalised posteriors. Priors are renormalised to sum to 1.
Annotations the server declares
- title: Bayesian update
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
confidence_intervalConfidence interval for a mean (t-based; from data, or n/mean/sd) or a proportion (Wilson; successes/n).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Confidence interval for a mean (t-based; from data, or n/mean/sd) or a proportion (Wilson; successes/n). kind = mean | proportion; confidence default 0.95.
Annotations the server declares
- title: Confidence interval
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
descriptive_statsSummary statistics for a numeric array: mean, median, sd, variance, quartiles, IQR, skewness, min/max.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Summary statistics for a numeric array: mean, median, sd, variance, quartiles, IQR, skewness, min/max.
Annotations the server declares
- title: Descriptive statistics
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
distributionEvaluate a probability distribution (normal, t, chi2, binomial, poisson): pdf/pmf and cdf at a value, and/or the quantile at a probability, plus mean & variance.1 finding
Why it is in this group
- The description's first verb is "evaluate": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "distribution" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "evaluate": a word for a change.
  What this check looks for
Description, as the server wrote it
Evaluate a probability distribution (normal, t, chi2, binomial, poisson): pdf/pmf and cdf at a value, and/or the quantile at a probability, plus mean & variance. Params per dist: normal {mean,sd}, t {df}, chi2 {df}, binomial {n,p}, poisson {lambda}.
Annotations the server declares
- title: Probability distribution
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
hypothesis_testRun a significance test and get the statistic, p-value, and a plain-language interpretation with assumptions.1 finding
Why it is in this group
- The description's first verb is "run": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "hypothesis_test" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The description's first verb is "run": a word for a change.
  What this check looks for
Description, as the server wrote it
Run a significance test and get the statistic, p-value, and a plain-language interpretation with assumptions. test = one-sample-t {data, mu0}, two-sample-t {data1, data2}, one-proportion-z {successes, n, p0}, two-proportion-z {successes1,n1,successes2,n2}, chi2-gof {observed, expected?}, chi2-independence {table}. Optional tail: two-sided (default) | greater | less; alpha default 0.05.
Annotations the server declares
- title: Hypothesis test
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
linear_regressionSimple linear regression of y on x: slope, intercept, r, r², slope std error and p-value, equation.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Simple linear regression of y on x: slope, intercept, r, r², slope std error and p-value, equation.
Annotations the server declares
- title: Linear regression
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http databutler-stats https://databutler.dev/api/mcp/stats

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__databutler-stats__descriptive_stats",
      "mcp__databutler-stats__distribution",
      "mcp__databutler-stats__hypothesis_test",
      "mcp__databutler-stats__confidence_interval",
      "mcp__databutler-stats__bayes_update",
      "mcp__databutler-stats__linear_regression"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as databutler-stats. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.physics-star-cat/databutler-stats/changes.xml

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Anlyon alternative

6 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

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Source: MCP Registry · repository. Synced Oct 21, 2026, 18:43 UTC.

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