Pasr MCP server
io.github.Apheironn/pasr·v0.4.0Local, token-budgeted code context with file:line provenance and selection receipts.
0 stars89 downloads/wk
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If you have run it, two minutes of your experience saves the next person an afternoon.
Pasr tools
No tool declarations could be read from the package source. They show once the server is installed.
Public scan report
scanner v0.1.10 · 2026-10-14 · same rubric, same numbers if you re-run it
- Code scan39 source files scanned25/25
- –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 9 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
How Pasr compares
Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 92/100
- higher than 95% of 48,255 servers
- Downloads a week
- 89
- more than 60% of 12,191 servers with a package
Install Pasr in Claude Code, Cursor or VS Code
claude mcp add pasr -- uvx pasr-mcp
What the publisher says
From the Pasr repository's README, as published. We do not edit it. Read it on GitHub
<!-- mcp-name: io.github.Apheironn/pasr -->
Provenance-Aware Span Recall — local, token-budgeted, source-traceable context for coding agents.
The problem
Agents need enough source to answer correctly, while every retrieved observation can be carried into later model requests. Native grep and bounded file reads already provide useful source and provenance. PASR must justify its additional retrieval, selection, and tool-catalog complexity against that baseline—not against dumping the entire repository.
What PASR does
Budgeted
Live selectcontext budgets the returned context**, including labels, headings, separators, and redaction—not the MCP JSON envelope or cumulative conversation. Whole computed spans are admitted only when that final representation fits; spans are not necessarily complete functions. Lossless selection uses the exact rendered cost, and optional headers cannot displace source that already fits.
Traceable
Selection receipts record each span's file:line, token count, retrieval signals, and why it was kept or dropped. Receipts are saved under .pasr/receipts; persistence is best-effort, and the response reports whether a receipt was written. They cover PASR-delivered context, not everything an agent reads or does.
Honest
Receipts expose heuristic query classifications, keyword coverage, and routing advice. These are not calibrated correctness probabilities or proof that all necessary evidence was retrieved. Advice must not replace checking the source.
Local by default
No daemon, vector database, or manual index setup is required. Offline selection needs installed dependencies and cached tokenizer data; optional model weights are separate. The client can still forward returned source to a cloud model. Default redaction is a no-op, not automatic secret detection.
Install
Install version 0.4.0 from PyPI. Install uv and make uvx available on your PATH; use Python 3.10+ or allow uv to provision it. No PASR checkout is required. Replace /absolute/path/to/project with the repository to inspect, then choose the command for your client:
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Pasr: common questions
- Is Pasr MCP server safe?
- Yes, by our scan: it is graded A (92/100). Read the Pasr safety report
- How do I install Pasr?
- It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
- Does Pasr need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Pasr maintained?
- The last commit was 30 days ago (2026-10-05). The latest release is v0.4.0.
- What can I use instead of Pasr?
- Servers from other publishers that do the same job: Token Optimizer MCP server.
- How does Pasr compare with other MCP servers?
- safety score 92/100 (higher than 95% of 48,255 servers); downloads a week 89 (more than 60% of 12,191 servers with a package). Full comparison.
Alternatives to Pasr
Same job from other publishers: the closest match first, then the best rated.
- Token OptimizerContext-window optimization: caching, compression & smart file tools that cut tokens 60-90%.not reviewedEstablishedC
