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PromptBranch MCP server

by PromptBranch·io.github.PromptBranch/promptbranch·v0.2.6
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Local-first MCP server for versioning, searching, evaluating, and improving AI prompts.

B83/100grade B
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Safety scan
B83/100

full report

Adoption
Growing

3 stars228 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

PromptBranch tools (6, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • add_note

    Attach a freeform note to a prompt (or a specific version of it).

  • get_prompt

    Fetch and render a prompt. If status is needs_input, do not execute content: ask the user for every missingVariables value, then call get_prompt again with variables. Execute content only when status is ready. Defaults to the current (preferred) version; pin with version and/or branch.

  • list_prompts

    List prompts in the library, optionally filtered by collection or tag.

  • report_runwrite action

    Report that a prompt version was used: which tool/model ran it, the outcome rating (1\u20135) and a short result summary.

  • search_prompts

    Full-text search over prompt titles, descriptions, tags, notes and version content.

  • suggest_variation

    Propose a rewritten version of a prompt. Creates a PENDING suggestion that a human must approve in the PromptBranch app before it becomes usable \u2014 agents propose, humans approve.

Public scan report

scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it

1 medium
  • Code scan2 source files scanned20/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 1 days ago15/15
  • Maintainer identityregistry namespace matches repository owner7/10

Findings (1)

  • mediumeval / new Function usedexec.eval
    dist/index.js: …ode, sch); const makeValidate = new Function(`${names_1.default.self}`, `${names_1.de…
Overall 83/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install directly

Runs npx -y @promptbranch/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add promptbranch -- npx -y @promptbranch/mcp
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PromptBranch: common questions

Is PromptBranch MCP server safe?
Mostly: it is graded B (83/100). Read the PromptBranch safety report
How do I install PromptBranch?
It runs on your machine. Copy the Claude Code, Claude Desktop or Cursor config from the install section.
Does PromptBranch need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is PromptBranch maintained?
The last commit was in the last day (2026-09-19). The latest release is v0.2.6.

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