mcp-server-dig

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MCP server for AI-powered code archaeology — explore git blame, file history, contributor patterns, and co-change analysis through the Model Context Protocol.

Tools

Workflow Integration

Tool	Description
git_review_prep	PR review briefing with risk flags, reviewer suggestions, and missing file detection
git_why	Code archaeology narrative — explains why code exists by combining blame, commits, contributors, and co-changes

Composite Analysis

Tool	Description
git_file_risk_profile	Multi-dimensional risk assessment for a single file
git_repo_health	Repository-wide health summary
git_code_ownership_changes	Compare code ownership before/after a date boundary — detects owner handoffs, bus factor changes, knowledge transfer patterns
git_impact_analysis	Blast radius analysis for a file or directory — combines co-change networks, contributor overlap, and directory coupling
git_knowledge_loss_risk	Assess knowledge loss risk per contributor — identifies directories where a single person owns most of the code (bus factor = 1) and estimates recovery cost
git_trend_analysis	Analyze trends over time by comparing metrics across multiple time periods — tracks whether hotspot count, code churn, contributor count, or commit activity is improving, stable, or worsening
git_refactor_candidates	Identify and rank refactoring candidates across the repository using 5-dimension risk assessment (change frequency, code churn, knowledge concentration, coupling, staleness)
git_release_comparison	Compare repository metrics between two git refs (tags, branches, commits) — shows how hotspots, churn, contributor count, and bus factor changed between releases
git_complexity_hotspots	Identify and rank maintenance complexity hotspots using 6-dimension assessment (change frequency, code churn, knowledge concentration, coupling, staleness, conflict frequency)
git_contributor_growth	Analyze contributor growth and retention over time — tracks new/departed contributors per period (monthly/quarterly), computes retention rates, bus factor trends, and classifies trajectory as growing/stable/shrinking
git_offboarding_simulation	Simulate the impact of a contributor leaving — recomputes bus factor per directory after removing the author's contributions, identifies new single-points-of-failure and knowledge gaps
git_coordination_bottleneck	Detect directories with high coordination cost — ranks by composite score of change frequency, unique authors, and ownership distribution to identify merge conflict hotspots
git_expertise_decay	Track expertise freshness — detect directories where dominant code owners have become inactive or are fading
git_stability_prediction	Predict file stability by combining 4 signals: revert ratio, churn trend, code age, and conflict frequency — scores each file 0-100

Data Retrieval

git_file_history

Get the commit history for a specific file with diff stats.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo
max_commits	number	no	Maximum commits to return (default: 20)
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"

git_blame_context

Semantic blame that groups consecutive lines by the same commit into blocks.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo
start_line	number	no	Start of line range
end_line	number	no	End of line range
detect_moves	boolean	no	Detect code moved from other files using git blame -M (default: false)

git_related_changes

Find files that frequently change together with a given file (co-change analysis).

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo
max_commits	number	no	How many commits to analyze (default: 100)
min_coupling	number	no	Minimum co-change count to include (default: 2)

git_contributor_patterns

Analyze contributor patterns — who has expertise in what areas.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
path_pattern	string	no	Directory or path to scope analysis, e.g. "src/api/"
since	string	no	Date filter, e.g. "2024-01-01" or "1 year ago"
max_commits	number	no	Maximum commits to analyze (default: 500)

git_search_commits

Search commit messages by keyword. Useful for finding when a feature was introduced, a bug was fixed, or locating commits related to a ticket number.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
query	string	yes	Search string to match against commit messages
max_commits	number	no	Maximum number of commits to return (default: 20)
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
author	string	no	Filter by author name or email
path_pattern	string	no	Limit search to commits touching this path

git_commit_show

Show detailed information about a specific commit: full message, changed files, and optionally the diff. Useful for drilling into a commit found via git_search_commits.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
commit	string	yes	Commit hash (short or full), branch name, or tag
show_diff	boolean	no	Include the full diff output (default: false, shows stat only)

git_diff_context

Show the diff between two commits, branches, or tags. Useful for understanding what changed between releases, branches, or any two points in history.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
commit	string	yes	Target commit, branch, or tag
compare_to	string	no	Base to compare against (default: parent commit)
file_path	string	no	Limit diff to a specific file
stat_only	boolean	no	Show only file change statistics (default: false)
context_lines	number	no	Number of context lines in unified diff (default: 3)
word_diff	boolean	no	Show word-level diffs using git diff --word-diff=plain (default: false)

git_hotspots

Identify the most frequently changed files in the repository. Files with high change frequency often indicate areas of technical debt, active development, or bug-prone code.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
path_pattern	string	no	Limit analysis to a specific directory, e.g. "src/"
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Number of commits to analyze (default: 500)
top_n	number	no	Number of top files to return (default: 20)

git_pickaxe

Search for commits that introduced or removed a specific string or regex pattern in the codebase (git's pickaxe feature). Essential for finding when a function, variable, or pattern first appeared or was removed.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
search_term	string	yes	String or regex pattern to search for in code changes
is_regex	boolean	no	Treat search_term as regex -G instead of literal -S (default: false)
max_commits	number	no	Maximum number of commits to return (default: 20)
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
author	string	no	Filter by author name or email
path_pattern	string	no	Limit search to commits touching this path

git_code_churn

Analyze code churn (lines added + deleted) per file. High churn files may indicate unstable code, frequent refactoring, or areas needing architectural attention. Complements git_hotspots by measuring change volume, not just frequency.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
path_pattern	string	no	Limit analysis to a specific directory, e.g. "src/"
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Number of commits to analyze (default: 500)
top_n	number	no	Number of top files to return (default: 20)

git_stale_files

Find files that have not been modified for a long time. Stale files may indicate dead code, forgotten configuration, or areas of technical debt that need review or removal.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
threshold_days	number	no	Minimum days since last change to consider stale (default: 180)
path_pattern	string	no	Limit analysis to a specific directory, e.g. "src/"
top_n	number	no	Maximum number of stale files to return (default: 30)

git_merge_base

Find the common ancestor (merge base) of two branches or refs and show commits on each side since divergence. Useful for understanding branch relationships and reviewing what will be merged.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
ref1	string	yes	First branch or ref (e.g. "main")
ref2	string	yes	Second branch or ref (e.g. "feature-branch")
max_commits	number	no	Maximum commits to show per side (default: 50)

git_tag_list

List tags sorted by creation date with associated messages. Useful for understanding release history and versioning patterns.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
pattern	string	no	Glob pattern to filter tags, e.g. "v1.*"
max_tags	number	no	Maximum number of tags to return (default: 50)
sort	string	no	Sort order: "newest" or "oldest" (default: "newest")

git_knowledge_map

Show who owns knowledge of each directory, including bus factor analysis. Helps identify knowledge concentration risks and areas where team cross-training is needed.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
path_pattern	string	no	Limit analysis to a specific directory, e.g. "src/"
depth	number	no	Directory depth for aggregation (default: 2)
since	string	no	Date filter, e.g. "2024-01-01" or "1 year ago"
max_commits	number	no	Maximum commits to analyze (default: 500)

git_dependency_map

Visualize implicit dependency networks between directories based on co-change patterns. Directories that frequently change together may have hidden coupling.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
depth	number	no	Directory depth for aggregation (default: 2)
since	string	no	Date filter, e.g. "2024-01-01" or "1 year ago"
max_commits	number	no	Maximum commits to analyze (default: 500)
min_coupling	number	no	Minimum co-change count to include (default: 3)

git_bisect_guide

Pre-bisect analysis for identifying bug-introducing commits. Shows commit count in range, estimated bisect steps, hotspots, and relevant commits. Does NOT run git bisect itself.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
good_ref	string	yes	Known good reference where the bug did not exist
bad_ref	string	no	Known bad reference where the bug exists (default: HEAD)
file_path	string	no	Optional file path to focus on

git_rename_history

Track the rename history of a file. Reconstructs the full rename chain showing how a file was renamed over time.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo
max_entries	number	no	Maximum number of commits to scan (default: 50)

git_commit_graph

Analyze merge patterns and branch integration topology. Calculates merge ratio, merge frequency, merge sources, and classifies the integration style.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Analysis period (default: "6 months ago")
max_commits	number	no	Maximum commits to analyze (default: 1000)

git_branch_activity

Analyze branch activity levels, classifying branches as active, stale, or abandoned based on recent commit activity.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
include_remote	boolean	no	Include remote branches (default: false)
stale_days	number	no	Days without commits to consider stale (default: 30)
abandoned_days	number	no	Days without commits to consider abandoned (default: 90)

git_author_timeline

Analyze author activity periods and team composition changes over time.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter, e.g. "2024-01-01" or "1 year ago"
path_pattern	string	no	Limit analysis to a specific path, e.g. "src/"
max_commits	number	no	Maximum commits to analyze (default: 1000)

git_commit_frequency

Analyze commit frequency over time periods. Groups commits into daily, weekly, or monthly buckets to identify development patterns.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
granularity	string	no	Time granularity: "daily", "weekly" (default), or "monthly"
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Maximum commits to analyze (default: 1000)
path_pattern	string	no	Limit analysis to a specific path, e.g. "src/"

git_release_notes

Generate release notes between two refs by aggregating commits using Conventional Commits format. Groups by type/scope, detects breaking changes, and lists contributors.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
from_ref	string	yes	Start ref (tag, branch, or commit)
to_ref	string	no	End ref (default: HEAD)
group_by	string	no	Grouping: "type" (default), "scope", or "none"
include_breaking	boolean	no	Include breaking changes section (default: true)
max_commits	number	no	Maximum commits to analyze (default: 500)

git_contributor_network

Analyze contributor collaboration network. Shows which developers work on the same files, revealing team collaboration patterns and knowledge silos.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Maximum commits to analyze (default: 500)
path_pattern	string	no	Limit analysis to a specific path, e.g. "src/"
min_shared_files	number	no	Minimum shared files to show a collaboration link (default: 1)

git_conflict_history

Detect files that frequently appear in merge commits. High-frequency merge files indicate conflict-prone areas that may need refactoring.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_merges	number	no	Maximum merge commits to analyze (default: 200)
top_n	number	no	Number of top files to return (default: 20)
path_pattern	string	no	Limit analysis to a specific path, e.g. "src/"

git_survival_analysis

Analyze code churn trends over time. Shows additions, deletions, net change, and churn rate per period. Useful for identifying refactoring phases and code instability.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
granularity	string	no	Time granularity: "daily", "weekly" (default), or "monthly"
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Maximum commits to analyze (default: 1000)
path_pattern	string	no	Limit analysis to a specific path, e.g. "src/"

git_code_age

Analyze the age distribution of code lines in a file using blame data. Groups lines into age brackets (< 1 month, 1-3 months, 3-6 months, 6-12 months, > 1 year) to visualize how old different parts of a file are.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo

git_commit_message_quality

Analyze commit message quality metrics including Conventional Commits compliance rate, average subject length, long subject violations (>72 chars), issue reference rate, and type distribution.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Maximum commits to analyze (default: 200)
path_pattern	string	no	Limit analysis to commits touching this path
author	string	no	Filter by author name or email

git_reflog_analysis

Analyze git reflog entries to understand HEAD movement history. Shows branch switches, resets, rebases, and other ref updates. Useful for recovering lost commits and understanding local workflow patterns.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
ref	string	no	The ref to show reflog for (default: HEAD)
max_entries	number	no	Maximum number of reflog entries (default: 50, max: 500)
action_filter	string	no	Filter by action type (e.g. 'commit', 'checkout', 'reset', 'rebase')

git_cherry_pick_detect

Detect cherry-picked or equivalent commits between branches using git cherry. Shows which commits have already been applied to upstream and which are unique. Useful for identifying duplicate work across branches.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
upstream	string	yes	The upstream branch to compare against (e.g. 'main')
head	string	no	The branch to check (default: current HEAD)

git_line_history

Track the evolution of specific lines or a function using git log -L. Shows how a code block changed across commits — unlike blame (snapshot) or file_history (file-level), this reveals line-level change history.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	File path relative to the repository root
start_line	number	no	Start line of the range (requires end_line)
end_line	number	no	End line of the range (requires start_line)
funcname	string	no	Function name to track (alternative to line range)
max_commits	number	no	Maximum commits to show (default: 20)

git_commit_cluster

Detect clusters of related commits by time proximity and shared files. Reveals logical changeset boundaries — groups of commits that form a coherent change.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Only include commits after this date
author	string	no	Filter commits by author name or email
max_commits	number	no	Maximum commits to analyze (default: 200)
time_window_minutes	number	no	Time window for clustering in minutes (default: 120)
min_shared_files	number	no	Minimum shared files to link commits (default: 1)
path_pattern	string	no	Filter commits by file path pattern

git_merge_timeline

Analyze merge frequency over time. Shows merge counts, branch activity, and trend direction per period.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
granularity	string	no	Time period granularity: "weekly", "monthly", "quarterly" (default: "monthly")
num_periods	number	no	Number of periods to analyze (default: 6, max: 24)
path_pattern	string	no	Filter to a specific path
since	string	no	Override start date

git_complexity_hotspots

Identify and rank maintenance complexity hotspots using 6-dimension risk assessment (change frequency, code churn, knowledge concentration, coupling, staleness, conflict frequency).

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter
max_commits	number	no	Number of commits to analyze (default: 500)
top_n	number	no	Number of top hotspots to return (default: 10, max: 100)
path_pattern	string	no	Filter files by path pattern

git_contributor_growth

Analyze contributor growth and retention over time. Tracks new/departed contributors per period (monthly or quarterly), computes retention rates, bus factor trends, and classifies overall trajectory as growing/stable/shrinking.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
period	string	no	Aggregation period: "monthly", "quarterly" (default: "monthly")
since	string	no	Date filter (e.g. "2024-01-01", "1 year ago")
path_pattern	string	no	Filter commits affecting paths matching pattern
max_commits	number	no	Maximum number of commits to analyze (default: 10000)

git_code_ownership_changes

Compare code ownership before and after a date boundary. Detects owner handoffs, bus factor changes, new/departed contributors, and knowledge transfer patterns.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
period_boundary	string	yes	Date boundary for before/after comparison (e.g. "2024-06-01", "3 months ago")
depth	number	no	Directory depth for aggregation (1-5, default: 1)
path_pattern	string	no	Limit analysis to a specific directory
max_commits	number	no	Maximum commits to analyze (default: 500)

git_impact_analysis

Analyze the blast radius of changes to a file or directory. Combines co-change networks, contributor overlap, and directory coupling to assess how far changes might ripple.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
target_path	string	yes	File or directory path to analyze impact for
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Maximum commits to analyze (default: 500)
min_coupling	number	no	Minimum co-change count to include (default: 2)

git_review_prep

Generate a PR review briefing by analyzing the diff between two refs. Combines diff stats, commit history, hotspot/churn analysis, contributor patterns, and co-change detection to surface risk flags, suggest reviewers, and warn about potentially missing files.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
base_ref	string	yes	Base ref for comparison, e.g. "main"
head_ref	string	no	Head ref for comparison (default: "HEAD")
max_commits	number	no	Number of commits to analyze (default: 500)

Example output:

PR Review Briefing: main...HEAD
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Commits (2):
  abc1234 feat: add new feature
  def5678 fix: handle edge case

Changed files (3, +35 -10):
  src/foo.ts | +25 -5
  src/bar.ts | +10 -5

Risk flags:
  src/foo.ts — HOTSPOT (15 changes), HIGH CHURN (450 lines)

Suggested reviewers:
  Alice <alice@example.com> — 12 commits to src/foo.ts

Potentially missing files:
  src/foo.test.ts — co-changes with src/foo.ts 85% of the time

git_why

Explain why code exists by combining blame, commit context, contributor patterns, and co-change analysis into a narrative. Answers the question "Why does this code look this way?" for a file or line range.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo
start_line	number	no	Start of line range
end_line	number	no	End of line range
max_commits	number	no	Maximum number of commits to show in detail (default: 10)

Example output:

Why does this code exist? — src/foo.ts L10-25
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Blame summary (3 commits, 2 authors):

[L10-15] abc1234 | 2024-06-15 | Alice
  Commit: feat: add validation logic
  Files in commit: src/foo.ts, src/foo.test.ts

[L16-25] def5678 | 2024-08-20 | Bob
  Commit: fix: handle null input (Fixes #42)
  Files in commit: src/foo.ts, src/bar.ts

File context:
  Contributors: Alice (80%), Bob (20%)
  Co-changed with: src/foo.test.ts (85%), src/types.ts (60%)

git_file_risk_profile

Comprehensive risk assessment for a single file combining change frequency, code churn, knowledge concentration, implicit coupling, and staleness into a multi-dimensional profile.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
file_path	string	yes	Relative path to the file within the repo
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Number of commits to analyze (default: 500)

Example output:

Risk profile for: src/core/engine.ts
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Change frequency:  HIGH (47 changes, top 3%)
Code churn:        HIGH (1,230 lines churned)
Knowledge risk:    MEDIUM (2 contributors, top owns 78%)
Coupling:          HIGH (12 co-changed files)
Staleness:         LOW (last changed 3 days ago)

Overall: HIGH RISK
Concerns: frequently changing, high code churn, highly coupled

git_repo_health

Repository-wide health summary combining file count, commit activity, top hotspots, highest churn files, contributor distribution, and stale file count into a single overview.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter for activity analysis
max_commits	number	no	Number of commits to analyze (default: 500)
stale_threshold_days	number	no	Days without change to consider stale (default: 180)

git_repo_statistics

Analyze repository physical structure and size metrics — object counts, pack statistics, total commits, branch/tag counts, repository age, and largest tracked files.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
top_n_files	number	no	Number of largest tracked files to include (default: 10, max: 100)

git_commit_patterns

Analyze commit distribution by day-of-week and hour-of-day — heatmap-style patterns including peak activity windows, weekday/weekend ratios, and timezone distribution.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
author	string	no	Filter by author name or email (substring match)
since	string	no	Date filter (e.g. "2024-01-01", "6 months ago")
max_commits	number	no	Maximum number of commits to analyze (default: 1000)
path_pattern	string	no	Filter commits affecting paths matching pattern

git_revert_analysis

Analyze revert patterns in the repository — detects commits created by git revert, links them to their original commits, calculates time-to-revert statistics, and identifies files that are frequently reverted (revert hotspots).

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
since	string	no	Date filter (e.g. "2024-01-01", "6 months ago")
path_pattern	string	no	Filter reverts affecting paths matching pattern
top_n	number	no	Number of hotspot entries to return (default: 10)

git_velocity_anomalies

Detect statistical anomalies (spikes and drops) in commit frequency using mean +/- N sigma threshold.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
granularity	string	no	Time granularity: "daily", "weekly" (default), or "monthly"
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
max_commits	number	no	Maximum commits to analyze (default: 1000)
threshold_sigma	number	no	Number of standard deviations for anomaly detection (default: 2)
path_pattern	string	no	Limit analysis to a specific path, e.g. "src/"

git_tag_analysis

Analyze tag-based release patterns — semver distribution, annotated vs lightweight tags, release interval statistics, frequency trend, and naming prefix distribution.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
pattern	string	no	Glob pattern to filter tags, e.g. "v1.*" or "release-*"

git_activity_drought

Detect files with prolonged periods of no development activity (droughts). Identifies stagnant code by finding consecutive time periods with zero commits.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
path_pattern	string	no	Limit analysis to a specific path
since	string	no	Start of analysis window (default: "1 year ago")
granularity	string	no	Time granularity: "weekly" or "monthly" (default)
min_drought_periods	number	no	Minimum consecutive zero-activity periods to report (default: 2)
top_n	number	no	Maximum number of files to return (default: 20)

git_stability_prediction

Predict file stability by combining 4 signals: revert ratio, churn trend, code age, and conflict frequency. Returns a stability score (0-100) for each file.

Parameter	Type	Required	Description
repo_path	string	yes	Absolute path to the git repository
path_pattern	string	no	Limit analysis to a specific path
since	string	no	Date filter, e.g. "2024-01-01" or "6 months ago"
top_n	number	no	Maximum number of files to return (default: 20)

Prompts

MCP Prompts provide guided workflows that chain multiple tools together for common use cases.

Prompt	Description	Parameters
investigate-code	Code investigation — traces why code exists using blame, pickaxe, and file history	repo_path, file_path, line_range?
review-pr	PR review workflow — generates a review briefing with risk assessment	repo_path, base_ref, head_ref?
assess-health	Repository health assessment — evaluates overall repo quality	repo_path
trace-change	Change tracing — tracks when and why a specific string was added or removed	repo_path, search_term
onboard-codebase	New contributor onboarding — guided tour of repo structure, key contributors, and active areas	repo_path
find-bug-origin	Bug origin hunting — uses bisect analysis to identify bug-introducing commits	repo_path, good_ref, bad_ref?, file_path?, symptom?
technical-debt	Technical debt analysis — identifies high-risk files, knowledge concentration, and stale areas	repo_path
onboard-area	Area-specific onboarding — knowledge owners, contributors, and change history for a directory	repo_path, directory
ai-agent-safety	Pre-flight risk check for AI agents before modifying files — chains file_risk_profile, impact_analysis, related_changes, and conflict_history	repo_path, file_path
plan-refactoring	Refactoring planning — ranks candidates by 5-dimension risk, then drills into top files with risk profile, code archaeology, and impact analysis	repo_path, path_pattern?, top_n?
assess-change-risk	Pre-change risk assessment — evaluates file risk, blast radius, knowledge distribution, and code history before making changes	repo_path, file_path, change_description?
identify-tech-debt	Multi-tool technical debt analysis — chains refactor candidates, complexity hotspots, risk profiles, code age, and knowledge loss risk for a comprehensive debt report	repo_path, path_pattern?, top_n?
diagnose-performance	Repository performance diagnosis — chains repo statistics, hotspots, stale files, trend analysis, and dependency mapping for a comprehensive performance report	repo_path, path_pattern?, top_n?
post-incident-review	Post-incident review — chains commit search, diff context, revert analysis, file risk profile, and impact analysis to identify root cause and recommend prevention measures	repo_path, incident_date, suspected_files?
plan-release	Release planning review — chains release comparison, revert analysis, file risk profile, coordination bottleneck, and trend analysis to support release decisions	repo_path, base_ref, head_ref?, release_date?
find-experts	Find domain experts — discovers knowledge owners for a specific area using knowledge map, author timeline, blame, and contributor network	repo_path, path_pattern, since?
analyze-release-cadence	Release cadence analysis — chains tag analysis, commit frequency, and trend analysis to evaluate release health	repo_path, since?
prepare-knowledge-transfer	Knowledge transfer planning — chains offboarding simulation, knowledge map, loss risk, author timeline, and contributor network for departing developer preparation	repo_path, departing_author, timeline?

Resources

URI	Description
dig://tool-guide	Tool selection guide — maps common questions to the right tool
dig://repo-summary/{path}	Dynamic repository summary — generates overview with branch, file count, contributors, and recent commits

Setup

Prerequisites

• Node.js >= 22
• Git

Install

npm install -g mcp-server-dig

Or build from source:

git clone https://github.com/nakishiyaman/mcp-server-dig.git
cd mcp-server-dig
npm install
npm run build

Configure

Add to your MCP client configuration (e.g. Claude Desktop claude_desktop_config.json):

{
  "mcpServers": {
    "dig": {
      "command": "mcp-server-dig"
    }
  }
}

Or if running from source:

{
  "mcpServers": {
    "dig": {
      "command": "node",
      "args": ["./build/index.js"]
    }
  }
}

Zed

Add to your Zed settings.json:

{
  "context_servers": {
    "dig": {
      "command": {
        "path": "mcp-server-dig",
        "args": []
      }
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project root:

{
  "mcpServers": {
    "dig": {
      "command": "mcp-server-dig"
    }
  }
}

Windsurf

Add to your Windsurf MCP configuration:

{
  "mcpServers": {
    "dig": {
      "command": "mcp-server-dig"
    }
  }
}

Configuration

Timeout

All 54 tools accept an optional timeout_ms parameter (default: 30000ms, max: 300000ms) for large repositories.

Output Format

All 54 tools accept an optional output_format parameter:

• "text" (default) — human-readable formatted output
• "json" — structured JSON for programmatic consumption

Tool Annotations

All 54 tools declare MCP Tool Annotations (readOnlyHint: true, openWorldHint: false), enabling clients to understand that dig tools are read-only git analysis operations.

Streamable HTTP Transport

By default, dig runs on stdio. To use Streamable HTTP transport:

# Via CLI flag
mcp-server-dig --http

# Via environment variable
DIG_TRANSPORT=http mcp-server-dig

HTTP mode listens on http://127.0.0.1:3000/mcp. Change the port with DIG_PORT:

{
  "mcpServers": {
    "dig": {
      "command": "mcp-server-dig",
      "args": ["--http"],
      "env": {
        "DIG_PORT": "8080"
      }
    }
  }
}

Auto-completion

Prompt arguments and resource URI paths support MCP completion protocol for interactive clients.

Structured Logging

Logging uses the MCP Logging Protocol when connected to a client, with stderr fallback.

Set DIG_LOG_LEVEL environment variable to control log verbosity:

{
  "mcpServers": {
    "dig": {
      "command": "mcp-server-dig",
      "env": {
        "DIG_LOG_LEVEL": "debug"
      }
    }
  }
}

Available levels: debug, info (default), warn, error.

When DIG_LOG_LEVEL=debug, every git command execution logs its duration, and the analysis cache logs hit/miss events. This enables performance profiling and bottleneck identification.

Development

npm install
npm run build        # Compile TypeScript
npm run typecheck    # Type check without emitting
npm run lint         # ESLint
npm test             # Run tests (vitest)
npm run test:watch   # Watch mode

License

MIT