MCP Connector

Generate and Format Academic Citations

A CLI and Python library that resolves DOIs, PMIDs, arXiv IDs, ISBNs, and GitHub URLs into clean BibTeX citations.

Works with githubcrossrefsemantic scholaropenalexpubmed

84
Spark score
out of 100
Updated last month
Source checked Sep 18, 2026
Version 0.1.1
Models

Add to Favorites

Why it matters

Automate the tedious process of managing academic references. This tool intelligently fetches, enriches, and formats citations from various sources and identifiers into your preferred style.

Outcomes

What it gets done

01

Generate citations from DOIs, arXiv IDs, titles, or URLs.

02

Batch process multiple references for efficient citation generation.

03

Search academic literature using keywords across multiple databases.

04

Format citations in BibTeX, APA, or MLA styles with metadata enrichment.

Install

Add it to your toolbox

Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/vb-onecite | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

Reports

Agent outcome reports

No reports yet

Capabilities

Tools your agent gets

cite

Generates a single citation from DOI, arXiv ID, title, or URL in various formats.

batch_cite

Processes a list of references in batch mode for multiple citations.

search

Searches academic literature by keywords across various databases.

Overview

OneCite MCP Server

A CLI and Python library resolving DOIs, PMIDs, arXiv IDs, ISBNs, and GitHub URLs into consistent BibTeX entries via a 4-stage clean/query/validate/format pipeline across CrossRef, PubMed, arXiv, and other sources. Use to clean up mixed-format reference lists into BibTeX, or in CI via the benchmark/doctor commands; the Google Scholar fallback is off by default and only for candidate suggestions, never authoritative output.

What it does

OneCite is a command-line tool and Python library for citation management. It resolves strong identifiers - DOIs, PMIDs, arXiv IDs, ISBNs, GitHub URLs, Zenodo DOIs, and DataCite DOIs - into formatted BibTeX entries through a 4-stage pipeline (clean, query, validate, format) that queries source-specific APIs (CrossRef, PubMed, arXiv, Semantic Scholar, DataCite, Zenodo, GitHub, Google Books) and fills in whatever fields each source returns (journal, volume, pages, authors, abstract). It handles 7+ citation types: journal articles, conference papers, books, software, datasets, theses, and preprints. Plain-text title searches, which can't be resolved with confidence, are handled by a separate onecite suggest command that returns candidate matches for human review rather than being mixed into verified BibTeX output. When automatic entry-type detection is inconclusive, YAML-based custom templates provide a fallback entry type.

When to use - and when NOT to

Use this to clean up a reference list accumulated from mixed sources - DOIs copied from browser tabs, arXiv IDs from PDFs, PMIDs, ISBNs, software URLs, data DOIs, and stray BibTeX fragments - into a single consistent, auditable BibTeX file, or to look up a candidate citation from just a title.

The optional Google Scholar fallback in suggest (enabled with --google-scholar, requiring pip install onecite[scholar]) is off by default and used only as a last resort when CrossRef and Semantic Scholar return nothing, because it scrapes a service with no public API - it may be rate-limited or CAPTCHA-blocked and isn't guaranteed reproducible, which is exactly why it's exposed only on suggest for human review and never on the authoritative process command.

Capabilities

onecite process <input> is the main pipeline command, accepting a file path, - for stdin, or a raw identifier/reference string, with options for --input-type (txt or bib, auto-detected by extension when omitted), --template (fallback entry type, default journal_article_full), --output/-o, --quiet, --json (a stable JSON envelope instead of BibTeX text), --ndjson (streaming newline-delimited JSON for automation), and --fail-on-unresolved (exit code 2 if any entry can't be resolved). onecite suggest searches for candidate matches without producing BibTeX. onecite templates lists the bundled fallback templates (journal_article_full, conference_paper, book, thesis, dataset, software). onecite benchmark runs a small deterministic regression suite across DOI, arXiv, PMID, GitHub, and Zenodo/DataCite lookups, designed for CI with a configurable --min-success-rate gate and an optional --live mode against real APIs instead of offline fixtures. onecite doctor checks local installation health - package importability, bundled templates, benchmark resources, and the repository's own OneCite Skill - emitting a stable JSON envelope for automation. Exit codes are 0 success, 1 error, and 2 for unresolved entries under --fail-on-unresolved.

How to install

Install from PyPI with pip install onecite (Python 3.10+); the optional Google Scholar fallback needs pip install onecite[scholar]. It can also be used directly as a Python library via process_references(). The repository includes a self-contained skill package at skills/onecite/SKILL.md giving automation and contributor workflows a repeatable procedure for reference cleanup plus benchmark and doctor checks - it does not install itself into any local tool memory. The project is MIT-licensed.

Who it's for

Researchers and academic writers cleaning up mixed-format reference lists into consistent BibTeX, and CI/automation workflows that need a scriptable, JSON-friendly citation-resolution pipeline with deterministic pass/fail checks.

# Recommended: Install from PyPI
pip install onecite
Source README

OneCite Logo

OneCite

Auditable citation normalization for research workflows

Downloads
Awesome CLI Apps

Tests
codecov
PyPI
Python
MIT
Docs
Awesome LaTeX

FeaturesQuick StartPrivacy & External Services📖 Advanced Usage🗺️ Roadmap🤝 Contributing


OneCite is a command-line and Python toolkit that turns messy, mixed-format references - DOIs, PMIDs, arXiv IDs, ISBNs, URLs, and BibTeX fragments - into auditable BibTeX or CSL-JSON records. Strong identifiers follow documented metadata-service routes; ordinary ambiguous plain-text references are returned as candidates for review and are not auto-promoted by process.


AI-assisted writing, automated literature pipelines, and copy-paste research habits produce ever more reference objects in ever more formats - and ever more chances for wrong, fabricated, or mismatched bibliographic data. Reference managers (Zotero), parsers (AnyStyle, GROBID), format converters (Citation.js), and identifier-to-BibTeX helpers (doi2bib, Manubot) each solve one slice of the problem. OneCite targets the under-served step before references enter a manuscript, systematic review, or manager: an auditable normalization layer that routes strong identifiers (DOI, PMID, arXiv, ISBN, URL, data/software DOIs) to the applicable metadata services, completes available metadata, reports unresolved entries, and produces BibTeX or CSL-JSON.

OneCite is not another reference manager, and process does not auto-accept fuzzy title matches. Strong identifiers are resolved through documented source routes; explicitly labelled thesis/dissertation citations have a separate OpenAIRE/BASE route and can fall back to fields parsed from the input. Ordinary ambiguous text is returned as ranked candidates through onecite suggest for human review rather than silently emitted as source-resolved output. That process/suggest separation, together with machine-readable JSON/NDJSON, exit codes, and deterministic offline checks, makes OneCite a scriptable building block for agents, batch jobs, and reproducible reviews rather than a GUI library. Source resolution does not establish that a work is authentic, unretracted, or correctly described by upstream metadata.


Features

Feature Description
Candidate Suggestions Search incomplete plain-text references with onecite suggest without promoting them to resolved bibliography output.
Multiple Formats Input .txt/.bib → Output BibTeX or CSL-JSON.
4-stage Pipeline A 4-stage process (parse → identify → enrich → format) with explicit unresolved entries.
Field Completion Fill available fields returned by metadata sources, such as journal, volume, pages, authors, and abstract.
🎓 7+ Citation Types Handles journal articles, conference papers, books, software, datasets, theses, and preprints.
Input-Routed Lookup Uses source-specific routes for Crossref, arXiv, PubMed, Semantic Scholar, Google Books, and others. Not every source is queried for every input.
Many Identifier Types Resolves DOI, PMID, arXiv ID, ISBN, GitHub URL, Zenodo DOI, and DataCite DOI inputs.
Custom Templates YAML-based presets that provide a fallback BibTeX entry type when auto-detection is inconclusive.

🌐 Data Sources

CrossRef
Semantic Scholar
PubMed
arXiv
DataCite
Zenodo
Google Books

Quick Start

Install and try OneCite in a few steps.

1. Installation

The current public PyPI release is 0.1.1. This working tree documents the
unreleased 0.2.0 candidate, so install from the checkout when verifying
candidate-only behavior:

# Current stable public release
pip install onecite

# Unreleased 0.2.0 candidate, from the repository checkout
python -m pip install -e .

2. Create an Input File

Create a file named references.txt with your mixed-format references:

# references.txt
# Add blank lines between entries to avoid misidentification

10.1038/nature14539

arXiv:1706.03762

ISBN:9780262035613

https://github.com/tensorflow/tensorflow

10.5281/zenodo.3233118

arXiv:2103.00020

Smith, J. (2020). Neural Architecture Search. PhD Thesis. Stanford University.

3. Run OneCite

Execute the command to process your file and generate a clean .bib output.

onecite process references.txt -o results.bib --quiet

4. View Output

Your results.bib file now contains entries of different types.

View Complete Output (results.bib)
@article{LeCun2015Deep,
  doi = "10.1038/nature14539",
  title = "Deep learning",
  author = "LeCun, Yann and Bengio, Yoshua and Hinton, Geoffrey",
  journal = "Nature",
  year = 2015,
  volume = 521,
  number = 7553,
  pages = "436-444",
  publisher = "Springer Science and Business Media LLC",
  url = "https://doi.org/10.1038/nature14539",
  type = "journal-article",
  abstract = "Deep learning allows computational models that are composed of multiple processing layers to learn representations of data with multiple levels of abstraction...",
}
@inproceedings{Vaswani2017Attention,
  arxiv = "1706.03762",
  title = "Attention Is All You Need",
  author = "Vaswani, Ashish and Shazeer, Noam and Parmar, Niki and Uszkoreit, Jakob and Jones, Llion and Gomez, Aidan N. and Kaiser, Lukasz and Polosukhin, Illia",
  year = 2017,
  booktitle = "Advances in Neural Information Processing Systems (NeurIPS)",
  url = "https://arxiv.org/abs/1706.03762",
}
# ... and 5 more entries ...

📖 Advanced Usage

Direct String and Stdin Input
onecite process "10.1038/nature14539"
onecite suggest "Attention is all you need, Vaswani et al., NIPS 2017"
echo "10.1038/nature14539" | onecite process -
🐍 Use as a Python Library

Use OneCite directly in your Python scripts.

from onecite import process_references

result = process_references(
    input_content="10.1038/nature14539",
    input_type="txt",
    template_name="journal_article_full",
    output_format="bibtex",
)

print('\n\n'.join(result['results']))
💻 CLI Commands & Options

OneCite provides a command-line interface with the following commands and options:

onecite process

The main command for processing references through the OneCite pipeline.

Usage:

onecite process <input_file> [OPTIONS]

Arguments:

  • input_file - Input file path, - for stdin, or a strong identifier/reference string

Options:

Option Short Description Default
--input-type Input format: txt or bib txt
--template Fallback BibTeX entry-type preset when auto-detection is inconclusive journal_article_full
--output-format Output format: bibtex or csl-json for downstream tools that consume CSL-JSON bibtex
--output -o Output file path (default: stdout) -
--quiet -q Suppress verbose logging output False
--json Print a stable JSON envelope instead of BibTeX text False
--ndjson Print newline-delimited JSON events for streaming automation workflows False
--fail-on-unresolved Return exit code 2 when any entry cannot be resolved False

Examples:

# Process a text file
onecite process references.txt -o results.bib

# Process a BibTeX file with auto-detection
onecite process references.bib

# Use stdin
echo "10.1038/nature14539" | onecite process -

# Process a direct string (DOI)
onecite process "10.1038/nature14539"

# Process with custom template
onecite process references.txt --template conference_paper

# Quiet mode for scripts
onecite process references.txt -o results.bib --quiet

# Automation-friendly JSON with unresolved-entry exit-code handling
onecite process references.txt --json --fail-on-unresolved

# Streaming NDJSON for automation
onecite process references.txt --ndjson

# CSL-JSON item output (a development fixture verifies Pandoc 3.10 consumption)
onecite process references.txt --output-format csl-json -o references.json

The development evidence verifies Pandoc 3.10 consumption of representative
emitted items. Quarto, standalone citeproc, and reference-manager import
workflows are not separately validated in this release.

Report fields. Beyond results and failed_entries, the processing
report carries two audit signals:

  • warnings - non-blocking review warnings on resolved entries. Most
    importantly text_metadata_mismatch: the input text around a resolved DOI
    appears to describe a different work (the classic hallucinated
    title+DOI pairing). The DOI remains the resolved identifier and the entry resolves,
    but it is flagged for review instead of silently emitted as clean output.
  • duplicates - the same work appeared more than once in the batch (bare
    DOI, PMID, formatted citation). It is emitted once; repeats are reported
    with the emitted entry's cite key.

Failed entries carry the original input excerpt (raw_text) and a reason
code - doi_not_found (no registry record was returned after the implemented
fallback), no_strong_identifier (ambiguous text; use onecite suggest),
source_error (a source/identity failure surfaced on that route), and more.
These codes make important cases distinguishable, but they are not a complete
provider trace: some PMID, ISBN, and DataCite request errors currently collapse
into the same unresolved reason as a lookup miss.

onecite suggest

Search for candidate matches without producing BibTeX or returning a
validation passed status.

onecite suggest "Attention is all you need, Vaswani et al., NIPS 2017" --json

Candidates are for review, not source-resolved citations. Each suggestion
discloses the health of the consulted scholarly indexes in a sources
list. If a source was rate-limited or errored, the suggestion status becomes
candidates_found_incomplete / no_candidates_incomplete - the correct
match may be missing from the list entirely, and the candidate list must
not be treated as exhaustive. Candidates whose year contradicts the year
cited in the query are penalized and flagged with year_conflict. To turn
a reviewed candidate into source-resolved BibTeX, resolve its DOI through
onecite process "<doi>".

Optional Google Scholar fallback. suggest accepts --google-scholar
(requires the optional scholarly package: pip install onecite[scholar]).
It is consulted only as a best-effort fallback when CrossRef and Semantic
Scholar return nothing. Because it scrapes a service with no public API, it
is off by default, may be rate-limited or blocked by a CAPTCHA, and is not
guaranteed to be reproducible
- it is exposed only on suggest (candidates
for human review), never on process.

pip install onecite[scholar]
onecite suggest "some obscure title" --google-scholar

onecite --version

Display the installed OneCite version.

Usage:

onecite --version

onecite version

Alternative command to display version information.

Usage:

onecite version

onecite templates

List the bundled fallback BibTeX templates and the fields they request.

Usage:

onecite templates
onecite templates --json

onecite benchmark

Run a small deterministic regression suite for covered DOI lookup, arXiv
lookup, PMID/PubMed lookup, GitHub software URLs, Zenodo/DataCite dataset
DOIs, and mixed valid/invalid batches. The command is designed for CI and
automation workflows that need a machine-readable pass/fail check; it is not
a comprehensive citation-accuracy benchmark.

Usage:

onecite benchmark [OPTIONS]

Options:

Option Description Default
--cases Path to a custom benchmark suite JSON file bundled golden cases
--min-success-rate Minimum covered-case pass rate required for exit code 0 1.0
--json Print the benchmark report as JSON False
--live Use live external APIs instead of bundled offline fixtures False
--anti-hallucination Run the labelled non-fabrication evaluation instead of the golden cases False

Examples:

onecite benchmark
onecite benchmark --json
onecite benchmark --live --json
onecite benchmark --cases my_cases.json --min-success-rate 1.0 --json
onecite benchmark --anti-hallucination
onecite benchmark --anti-hallucination --json

The repository baseline record is stored at benchmarks/leaderboard.json, with
reproduction instructions in benchmarks/README.md.

Anti-hallucination evaluation

onecite benchmark --anti-hallucination runs a labelled, fully-offline
evaluation of OneCite's core safety property. It resolves real strong
identifiers (class A) into source-resolved BibTeX, leaves ambiguous
plain-text references (class B) and fabricated, non-existent DOIs (class
C - the kind a language model may hallucinate) unresolved rather than
emitting a wrong citation, and flags mismatched pairings (class D - a real
DOI attached to a different paper's title, the most common hallucinated-citation
shape) with a text_metadata_mismatch warning instead of silently emitting them
as clean source-resolved output. It reports three metrics:

  • resolution rate - fraction of class-A inputs correctly resolved;
  • non-fabrication rate - fraction of class-B/C inputs correctly left
    unresolved (not fabricated). 100% means OneCite invented no citations;
  • mismatch detection rate - fraction of class-D inputs resolved with
    the mismatch warning attached.

A pipeline crash is recorded as error and never counts as correct for any
metric - a clean rejection and a broken pipeline are different outcomes.

The dataset lives at src/onecite/benchmarks/anti_hallucination_cases.json, and the
evaluation is also available from Python via
onecite.run_anti_hallucination_eval().

onecite doctor

Check the local installation health for automation and CI. The doctor
command checks package importability, bundled templates, packaged benchmark
resources, the repository-contained OneCite Skill, and the offline benchmark
regression check.

Usage:

onecite doctor
onecite doctor --json

The JSON output is a stable envelope with schema_version, tool,
command, status, environment, summary, and checks fields.

OneCite Skill for Automated Workflows

The repository includes a local skill package at skills/onecite/SKILL.md.
It gives automation and contributor workflows a repeatable procedure for
reference cleanup, benchmark and doctor checks, and explicit
reporting of unresolved entries.
The skill is repository-contained and does not install itself into any local
tool memory.

Input Type Auto-Detection

When --input-type is not specified, OneCite automatically detects the input type:

  • Files ending with .bib are treated as BibTeX format
  • All other files and strings are treated as plain text

Available Templates

OneCite supports several template presets for different entry types:

  • journal_article_full - Full journal article entry (default)
  • conference_paper - Conference proceedings paper
  • book - Book entry
  • thesis - Thesis/dissertation entry
  • dataset - Dataset entry
  • software - Software/code entry

Exit Codes

  • 0 - Success
  • 1 - Error occurred (invalid input, processing failure, etc.)
  • 2 - One or more entries were unresolved when --fail-on-unresolved was used

For onecite benchmark and onecite doctor, exit code 0 means the
configured checks passed and exit code 1 means at least one check failed.

🗺️ Roadmap

  • OneCite Skill - Repository-contained operating guide for local citation-cleanup workflows
  • Benchmarking - Small deterministic regression suite, configurable pass-rate gate, and baseline record
  • Enhanced CLI - Automation-friendly JSON, NDJSON, summaries, and exit codes for reference processing
  • Anti-hallucination evaluation - Labelled offline eval of the non-fabrication property (resolution, non-fabrication, and mismatch detection rates), gated in CI
  • Audit-grade reports - Text/DOI mismatch warnings, failure reason codes with original input, DOI-level deduplication, and suggest source-health disclosure
  • CSL-JSON output - --output-format csl-json emits CSL-JSON items for downstream tools that consume the format; a development fixture verifies Pandoc 3.10 consumption, while Quarto, standalone citeproc, and reference-manager imports are not separately validated
  • Expanded suggest sources - Direct arXiv candidate search covers the CS venues that CrossRef does not index
  • Concurrent batch resolution - Parallel source lookups for large reference lists (currently sequential; latency depends on the selected routes and external services)
  • Larger anti-hallucination dataset - More labelled cases per class and a published live-mode baseline

🤝 Contributing

Contributions are always welcome! Please see CONTRIBUTING.md for development guidelines and instructions on how to submit a pull request.

📄 License

This project is licensed under the MIT License. See the LICENSE file for details.

FAQ

Common questions

Discussion

Questions & comments · 0

Sign In Sign in to leave a comment.