PromptBranch MCP server

by PromptBranch·io.github.PromptBranch/promptbranch·v0.2.6

Local-first MCP server for versioning, searching, evaluating, and improving AI prompts.

B83/100grade B

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B83/100

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3 stars228 downloads/wk

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

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.

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

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.Rubric Appeal a finding JSON

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

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 2 days ago (2026-09-19). The latest release is v0.2.6.