Epoch -- Time Estimation MCP Server

CI License: MIT MCP npm version MCP Registry

Epoch helps AI agents understand time.

AI can write code, analyze data, and build apps -- but it can't tell you how long something will take, what it'll cost, or whether a deadline is realistic. Epoch fixes that.

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Show Me

You: "How long will a 15,000 line project take with a small team?"

Claude (using Epoch):
  COCOMO II nominal: 100 person-months (traditional team)
  AI-adjusted: 9 person-months (LLM-assisted workflow)
  Schedule risk: medium (MAPE 15%, based on 28 historical features)
  Cost estimate (Claude Sonnet): ~$340 in API tokens

You: "How many working days between now and launch?"

Claude (using Epoch):
  Start: May 1, 2026
  End: July 15, 2026
  Business days: 54
  Weekend days: 16
  Holidays: 1 (Independence Day)
  Total calendar days: 75

You: "Which AI model should we use for a 50k-token job?"

Claude (using Epoch):
  gemini-2.0-flash:  $0.02 -- fast, budget-friendly
  gpt-4o-mini:       $0.02 -- fast, budget-friendly
  gemini-2.5-pro:    $0.37 -- standard, high quality
  claude-sonnet-5:    $0.57 -- standard, high quality
  Recommendation: gemini-2.0-flash for cost, claude-sonnet-5 for quality

Why Epoch?

Every AI agent hallucinates timelines. "This should take about 2 hours" becomes 2 days. Epoch gives AI grounded, data-driven estimates instead of guesses. It packages established estimation methods (PERT, COCOMO II, Monte Carlo, reference class forecasting) into 25 tools any AI can call -- so your assistant stops guessing and starts calculating.

Works out of the box. Epoch ships with a bundled reference database built from 126,223 real data points across task types, complexity levels, and estimation tools. You get accurate estimates from day one — no data collection or account setup required. If you choose to record your actuals, Epoch's self-improvement engine learns your patterns and gets even more precise over time.

What is MCP?

MCP (Model Context Protocol) is how AI assistants like Claude connect to external tools. Think of it like a plugin system -- you add Epoch with one command, and suddenly your AI assistant can estimate timelines, calculate business days, compare model costs, and predict whether your project will finish on time.

Quick Start

30-second setup -- works in Claude Code, Cursor, VS Code, and Windsurf:

claude mcp add epoch -- npx @kyanitelabs/epoch

That's it. Your AI assistant now has 25 time estimation tools.

Or add it to your project's .mcp.json:

{
  "mcpServers": {
    "epoch": {
      "command": "npx",
      "args": ["@kyanitelabs/epoch"]
    }
  }
}

Agent Skill

Epoch also ships a public agent skill at skills/epoch/SKILL.md. Use $epoch in compatible agent hosts when you want the agent to choose the right Epoch MCP or CLI workflow for time estimates, business-day math, model-cost comparison, schedule risk, and estimate-vs-actual feedback.

What Can Epoch Do?

What you want	What Epoch does	No jargon
"How long will this take?"	Gives you a realistic estimate with best/worst case ranges	Estimates
"Can we hit this deadline?"	Tells you if your timeline is realistic or risky	Schedule risk
"How much will the AI calls cost?"	Calculates token costs across 12 AI models side-by-side	Cost comparison
"How many business days between now and launch?"	Counts days excluding weekends and holidays (5 countries)	Calendar math
"Are our estimates getting better?"	Tracks your accuracy over time and auto-corrects	Self-improving
"What model should we use?"	Compares speed, cost, and quality across all major AI models	Model comparison

---

Technical Reference

Everything below is for developers who want to understand the internals, use the CLI or REST API, or contribute to Epoch.

Architecture

Six-layer design with 25 tools for time estimation, scheduling, cost analysis, and feedback:

Layer	Purpose	Tools
1. Core Temporal	Time, timezones, duration, date math	get_current_time, convert_timezone, parse_duration, time_math
2. Calendar Math	Business days, holidays (US/UK/FR/DE/JP)	add_business_days, count_business_days
3. Estimation	PERT, COCOMO II, sprint, CPM, Monte Carlo	pert_estimate, cocomo_estimate, sprint_forecast, critical_path, monte_carlo_schedule
4. Analytics	Reference class, context classification, calibration, token-time bridge	reference_class_estimate, estimate_from_context, calibrate_estimates, token_time_bridge
5. Cost & Risk	Token cost, model comparison, accuracy trends, risk, COCOMO validation	token_cost_estimate, compare_models, accuracy_trend, schedule_risk, cocomo_validate
6. Feedback	Record actuals, track pending estimates, batch operations, health checks	record_actual, get_pending_estimates, batch_record_actuals, feedback_health

Tool Reference

Layer 1 -- Core Temporal

get_current_time -- Current wall-clock time in any IANA timezone

Input:  { timezone: "America/New_York" }
Output: {
  iso: "2026-05-01T08:30:00.000-04:00",
  humanReadable: "Fri, May 1, 2026, 8:30 AM EDT",
  timezone: "America/New_York",
  utcOffset: "-04:00"
}

convert_timezone -- Convert a timestamp between IANA timezones

Input:  { timestamp: "2026-05-01T12:00:00Z", target_tz: "Asia/Tokyo" }
Output: {
  iso: "2026-05-01T21:00:00.000+09:00",
  timezone: "Asia/Tokyo",
  utcOffset: "+09:00",
  humanReadable: "Fri, May 1, 2026, 9:00 PM JST"
}

parse_duration -- Parse human-readable duration strings

Input:  { duration_string: "2h30m" }
Output: {
  input: "2h30m",
  totalSeconds: 9000,
  humanReadable: "2 hours 30 minutes"
}

time_math -- Date arithmetic operations

Input:  { operation: "add_days", date: "2026-05-01", value: 7 }
Output: {
  result: "2026-05-08T00:00:00.000Z",
  operation: "add_days",
  input: "2026-05-01"
}

Supported operations: add_days, add_business_days, diff, convert_tz, parse_nl, format_duration

Layer 2 -- Calendar Math

add_business_days -- Add N business days with holiday awareness (US, UK, FR, DE, JP)

Input:  { start_date: "2026-05-01", days: 5, country: "US" }
Output: {
  startDate: "2026-05-01",
  endDate: "2026-05-08",
  businessDays: 5,
  countryCode: "US",
  humanReadable: "5 business days from 2026-05-01 to 2026-05-08 (US)."
}

count_business_days -- Count business days between two dates

Input:  { start_date: "2026-05-01", end_date: "2026-05-15", country: "US" }
Output: {
  startDate: "2026-05-01",
  endDate: "2026-05-15",
  businessDays: 10,
  countryCode: "US",
  humanReadable: "10 business days between 2026-05-01 and 2026-05-15 (US)."
}

Layer 3 -- Estimation

pert_estimate -- PERT three-point estimation with confidence intervals and urgency scoring

Input:  {
  optimistic: 2,
  most_likely: 4,
  pessimistic: 12,
  unit: "hours"
}
Output: {
  expected: 5,
  variance: 2.78,
  stdDeviation: 1.67,
  confidence95: [1.67, 8.33],
  confidence99: [0, 10],
  unit: "hours",
  urgencyCategory: "medium",
  humanReadable: "Expected: 5 hours. 95% confidence: 1.67 to 8.33 hours. 99% confidence: 0 to 10 hours.",
  developerProfile: { mode: "ai_native", correctionFactor: 1.45 },
  adjustedEstimate: 7.25
}

cocomo_estimate -- COCOMO II software sizing with LLM-adapted cost drivers

Input:  {
  kloc: 15,
  reasoning_complexity: 1.2,
  context_completeness: 1.0,
  transformation_impact: 0.8,
  iterative_cycles: 1.5,
  human_oversight: 1.2
}
Output: {
  kloc: 15,
  personMonthsNominal: 99.9,
  personMonthsLlmAdjusted: 8.9,
  effortMultipliers: {
    reasoning_complexity: 1.2,
    context_completeness: 1.0,
    transformation_impact: 0.8,
    iterative_cycles: 1.5,
    human_oversight: 1.2,
    product: 1.728
  },
  developerProfile: { mode: "ai_native", correctionFactor: 1.45 }
}

LLM-adapted cost drivers include reasoning complexity, context completeness, transformation impact, iterative cycles, and human oversight requirements.

sprint_forecast -- Sprint velocity forecasting from historical data

Input:  {
  backlog_points: 100,
  velocity_history: [20, 25, 22, 23],
  sprint_length_days: 14,
  hours_per_sprint: 80
}
Output: {
  backlogPoints: 100,
  averageVelocity: 22.5,
  requiredSprints: 4.4,
  pessimisticSprints: 4.9,
  hoursPerPoint: 3.56,
  totalHours: 355.6,
  completionDays: 62,
  sprintLengthDays: 14,
  developerProfile: { mode: "ai_native", sprintVelocityPoints: 80, correctionFactor: 1.45 }
}

critical_path -- Critical Path Method with merge-bias adjustment for parallel tasks

Input:  {
  tasks: [
    { name: "A", duration: 5, predecessors: [] },
    { name: "B", duration: 3, predecessors: ["A"] },
    { name: "C", duration: 4, predecessors: ["A"] }
  ]
}
Output: {
  critical_path: ["A", "C"],
  total_duration: 9,
  slack_per_task: { A: 0, B: 1, C: 0 },
  merge_bias_adjustment: 0
}

monte_carlo_schedule -- Monte Carlo simulation with seeded PRNG for deterministic, reproducible results

Input:  {
  tasks: [
    { name: "A", optimistic: 2, most_likely: 4, pessimistic: 8 },
    { name: "B", optimistic: 1, most_likely: 3, pessimistic: 6 }
  ],
  iterations: 10000
}
Output: {
  p10: "5.9",
  p50: "7.91",
  p80: "9.39",
  p95: "10.75",
  riskEvents: [{ description: "Task \"A\" exceeded 1.5x PERT expected in 5% of simulations", probability: 0.05, impactDays: 3 }],
  criticalPathProbability: 0.8
}

Layer 4 -- Analytics

reference_class_estimate -- Reference class forecasting with planning fallacy correction

Input:  {
  task_type: "feature",
  complexity: 3
}
Output: {
  rawEstimate: 6.7,
  correctedEstimate: 11.1,
  correctionFactor: 1.67,
  sampleSize: 126223,
  baselineSource: "self-improvement",
  confidence: "pessimistic",
  developerProfile: { mode: "ai_native", estimationMape: 15, underestimationBias: 0.2, correctionFactor: 1.45 },
  adjustedEstimate: 9.7,
  note: "Correction factors from bundled reference database (126,223 samples). Record actuals to personalize further."
}

Valid task_type values: feature, bugfix, refactor, migration, infrastructure, documentation, testing, design.

estimate_from_context -- Classify a free-text task description and delegate to reference class estimation

Input:  {
  context: "Add OAuth2 login support to the API, including refresh token rotation and a new /auth/callback endpoint"
}
Output: {
  tool: "estimate_from_context",
  rawEstimate: 2,
  correctedEstimate: 2,
  correctionFactor: 1,
  sampleSize: 0,
  baselineSource: "inferred_scope_medium_real_tasks",
  scopeUsed: "medium",
  scopeGuide: "For feature tasks: small=~2.3h, medium=~6h, large=~10.6h, xl=~17h",
  classification: {
    classified_task_type: "feature",
    classified_complexity: 3,
    confidence: "medium",
    signals: ["task_type_matched:feature"],
    task_type_from_hint: false,
    complexity_from_hint: false
  },
  note: "Using reference database correction factors. Submit actuals via record_actual to improve accuracy."
}

Classifies task_type and complexity from free text (an issue body, PR/diff description, or task summary) using a local, deterministic keyword/signal heuristic -- no LLM call is made. Caller-supplied task_type/complexity hints always override the classification. The resolved inputs are then delegated to the same reference-class-forecasting path used by reference_class_estimate, so the response carries the same estimate fields plus a classification provenance block explaining how the tool read the context. When classification confidence is low, an additional lowConfidenceNote field is returned rather than silently guessing.

calibrate_estimates -- Team-specific accuracy calibration from historical estimated vs actual data

Input:  {
  task_type: "feature",
  team_id: "backend"
}
Output: {
  correctionFactor: 1.45,
  accuracyTrend: "stable",
  velocityTrend: "stable",
  recommendations: [
    "Using reference database correction factor (1.45x) — personalized from 126,223 samples.",
    "Record actuals via POST /v1/feedback/record-actual to refine for your team's patterns."
  ]
}

token_time_bridge -- Map LLM token budgets to wall-clock time for 12 model families

Input:  {
  tokens: 50000,
  model: "claude-sonnet-4-20250514",
  tool_calls: 10,
  reasoning_depth: "deep"
}
Output: {
  estimatedSeconds: 697,
  estimatedMinutes: 11.6,
  confidence: "likely",
  urgency: "short",
  breakdown: {
    promptTokens: 15000,
    completionTokens: 35000,
    toolOverheadSeconds: 2
  }
}

Layer 5 -- Cost & Risk

token_cost_estimate -- Token cost estimation for LLM API calls

Input:  {
  tokens: 50000,
  model: "claude-sonnet-5"
}
Output: {
  tokens: 50000,
  model: "claude-sonnet-5",
  estimatedSeconds: 695,
  estimatedMinutes: 11.6,
  estimatedCost: 0.57,
  costBreakdown: { inputCost: 0.045, outputCost: 0.525, toolCallOverheadCost: 0 },
  confidence: "likely"
}

compare_models -- Side-by-side cost and capability comparison across LLM models

Input:  {
  tokens: 50000,
  sort_by: "cost"
}
Output: {
  tokens: 50000,
  models: [
    { model: "gemini-2.0-flash", estimatedCost: 0.0155, qualityTier: "fast", tokensPerSecond: 230 },
    { model: "deepseek-v3", estimatedCost: 0.0189, qualityTier: "standard", tokensPerSecond: 97 },
    { model: "gpt-4o-mini", estimatedCost: 0.0233, qualityTier: "fast", tokensPerSecond: 180 }
  ],
  sortBy: "cost"
}

accuracy_trend -- Track estimation accuracy over time from recorded feedback data

Input:  { team_id: "backend", window_size: 50 }
Output: {
  overallTrend: "improving",
  currentMape: 26.5,
  industryBaselineMape: 25,
  totalEstimates: 1049,
  totalWithActuals: 1049,
  windows: [{ period: "Window 1 (estimates 1-50)", mape: 32, bias: 5.3, sampleSize: 50 }]
}

schedule_risk -- Schedule risk scoring for project timelines

Input:  {
  estimated_hours: 40,
  task_type: "feature"
}
Output: {
  estimatedHours: 40,
  riskLevel: "low",
  confidenceIntervals: { p50: 40, p80: 45.1, p95: 49.9 },
  historicalAccuracy: { mape: 15, sampleSize: 126223 },
  recommendation: "Low risk. Estimate is within normal variance.",
  humanReadable: "Schedule risk: low. MAPE: 15% (based on 0 historical records). Confidence intervals: p50=40h, p80=45.1h, p95=49.9h."
}

cocomo_validate -- Validate COCOMO II estimates against reference data

Input:  {}
Output: {
  projectsEvaluated: 182,
  mape: 85.55,
  bias: 53.5,
  byProjectType: {
    organic: { mape: 86.57, count: 22 },
    semidetached: { mape: 84.75, count: 106 },
    embedded: { mape: 86.71, count: 54 }
  },
  recommendedAdjustments: []
}

ai_native Mode

Epoch tools support dual estimation modes to account for the fundamentally different velocity of AI-assisted vs human-only development.

When ai_native=true (default), tools use Epoch's reference database with tool-aware correction factors. These baselines reflect AI agent workflows: faster iteration, higher output volume, and different error profiles.

When ai_native=false, tools apply human developer baselines:

Parameter	Human Baseline	AI-Native Baseline
Feature development	14 calendar days (industry data)	5.7h median (126K+ real tasks)
Bug fix turnaround	72 hours (industry data)	6.2h median (1,498 matched pairs)
Sprint velocity	35 story points (industry data)	80 story points
Estimation accuracy (MAPE)	25% (Jorgensen 2004)	15% (from AI-native profiles)
Correction factor	1.8x (industry standard)	1.07-1.45x (from reference DB)

Tools that support ai_native: pert_estimate, cocomo_estimate, sprint_forecast, reference_class_estimate, schedule_risk.

Hybrid workflows: ai_native accepts a float from 0.0 (fully human) to 1.0 (fully AI-native). Values like 0.5 produce interpolated profiles for mixed AI/human workflows. Boolean values (true/false) remain supported for backward compatibility.

Self-Improvement Engine

Epoch learns your patterns the more you use it. The bundled reference database already contains 126,223 data points with correction factors tuned from real estimate-vs-actual pairs across 8 task types — it works accurately on day one.

If you record your actuals, Epoch personalizes further:

1. Estimate -- Generate an initial estimate with any estimation tool
2. Record -- Track the actual outcome (record_actual)
3. Learn -- Self-improvement computes personalized correction factors from your data
4. Improve -- Future estimates apply your team's actual patterns
5. Trend -- accuracy_trend tracks whether your accuracy is improving over time

Your estimates + your actuals -> Your correction factors -> Better estimates -> Repeat

The loop can close itself. Recording actuals is the step everyone forgets, so Epoch can do it for you: epoch auto-actuals --session <id> records wall-clock-derived actuals for a session's unfinished estimates (agent hosts can wire it into a session-end hook). Auto-recorded actuals are sanity-bounded (0.05–12h, <10x the estimate), provenance-labeled auto_wallclock, never overwrite a real actual, and feedback_health reports them separately (byProvenance) so automated data can't silently skew your calibration.

Estimates lead with honest ranges. When at least 5 matched pairs exist for a task type, pert_estimate and reference_class_estimate open with a calibrated 80% interval ("Expected 1.6–4.2 hours (80% confidence interval); point estimate 2.5 hours") derived from your own historical estimate-vs-actual ratios — and say plainly when there isn't enough data yet.

The engine detects systematic biases (chronic under-estimation, accuracy degradation) and surfaces actionable recommendations.

You do not need to share data with anyone for this to work. Self-improvement runs entirely locally using your own ~/.epoch/ data.

The correction loop, measured

The self-improvement claim above isn't marketing copy -- it's backed by a runnable receipt. scripts/backtest-pert-correction.mjs makes a read-only temp copy of your ~/.epoch ledger, chronologically splits matched pert_estimate (estimate, actual) pairs 80/20, trains the learned per-(tool, task_type) correction factor on the training split only, and reports MdAPE on the held-out test split it never trained on:

npx tsx scripts/backtest-pert-correction.mjs

Measured on the maintainers' production ledger (697 held-out matched pairs at time of writing): MdAPE improved from 105.2% (uncorrected) to 80.5% (learned correction) on data the correction factor never saw during training. This is the mechanism EPOCH_PERT_LEARNED_CORRECTION gates behind before it's recommended on by default -- the script also checks that the corrected median actual/predicted ratio lands in [0.7, 1.3], and reports HOLD (not recommended yet) when that second guard hasn't cleared, so the flag doesn't ship as "on" until both hold. Run the script against your own ledger for your own numbers; they move as more actuals get recorded, which is the point.

reference_class_estimate's correction factors are the same learned mechanism applied to a different tool. Track its current calibration with epoch data status or feedback_health (per-tool MAPE/MdAPE, bias, and trend), or generate a full calibration decision-surface report with node scripts/build-calibration-dashboard.mjs -- also strictly read-only against your ledger.

Data Pipeline

Epoch uses a three-layer data strategy so it's accurate from the start and gets better over time:

1. Bundled reference database (works immediately, no setup): Epoch ships with a pre-built reference database containing 126,223 data points across 8 task types and 5 complexity levels. Correction factors are computed from real estimate-vs-actual pairs. You get accurate estimates the moment you install it.

2. Local self-improvement (automatic, private): As you use Epoch and record actuals, the self-improvement engine recalibrates correction factors from your data. This runs entirely locally in ~/.epoch/ — nothing leaves your machine. The engine triggers automatically every 100 tool calls or 24 hours.

• Auto-recording: Use scripts/auto-record-actual.mjs to automatically record actual time against pending estimates.
• Source tagging: Set EPOCH_SOURCE=<project-name> to tag estimates by project.
• Inspect your data: epoch data where and epoch data status show what's stored locally.

3. Community contributions (optional, opt-in): You can optionally share anonymized data to help improve baselines for all users. Community data is stripped of all identifying information — only task type, complexity, estimated hours, actual hours, and date remain. See CONTRIBUTING-data.md for format and privacy requirements.

epoch share-data --validate --description "My anonymized estimation data"

This is completely optional. Epoch works great without it.

Surfaces

Epoch exposes the same 25 tools through three interfaces:

Surface	Transport	Use Case
MCP Server	stdio	Claude Code, Cursor, VS Code, Windsurf
CLI	Direct invocation	Scripts, CI/CD, quick lookups
REST API	HTTP (Hono)	Web apps, AI agents, integrations

Default behavior: running epoch with no arguments starts the MCP stdio server.

CLI

# PERT estimate
epoch pert-estimate --optimistic 2 --most-likely 4 --pessimistic 12 --unit hours

# Token-to-time bridge
epoch token-time-bridge --tokens 50000 --model claude-sonnet-4-20250514

# Monte Carlo simulation
epoch monte-carlo-schedule --tasks '[{"name":"A","optimistic":2,"most_likely":4,"pessimistic":8}]'

# COCOMO II estimate
epoch cocomo-estimate --kloc 15 --project-type organic

# Schedule risk score
epoch schedule-risk --tasks '[{"name":"A","duration":5,"risk_level":"high"},{"name":"B","duration":3,"risk_level":"low"}]'

# List all tools
epoch list-tools

# Pretty table output
epoch pert-estimate --optimistic 2 --most-likely 4 --pessimistic 12 --pretty

REST API

# Start the server
epoch serve --port 3099
# or: EPOCH_TRANSPORT=http EPOCH_PORT=3099 epoch

# Call any tool
curl -X POST http://localhost:3099/v1/tools/pert_estimate \
  -H "Content-Type: application/json" \
  -d '{"optimistic": 2, "most_likely": 4, "pessimistic": 12, "unit": "hours"}'

# Health check
curl http://localhost:3099/health

# OpenAPI spec
curl http://localhost:3099/openapi.json

Agent-First

Epoch is built for agents as first-class callers, not humans typing in a terminal as an afterthought.

Why agents need time-sense. An LLM has no grounded sense of duration or cost -- it will say "quick fix" for a two-day migration and "big project" for a two-hour config change with equal confidence, because it has no feedback loop telling it otherwise. That's fine for a chat answer; it breaks down the moment an agent is planning multi-step work, sequencing a sprint, or deciding whether a deadline is realistic. Epoch gives the agent a calculator instead of a guess: PERT/COCOMO/Monte Carlo math, a reference-class baseline built from real task data, and a feedback loop that corrects itself as the agent (or its operator) records actuals.

EPOCH_TELEMETRY=1 for headless/agent operators. Telemetry is off by default and requires informed consent. For a human at a terminal, that consent is epoch telemetry enable, which shows the data and asks for confirmation. An agent should never be the one clicking "yes" to that prompt on its own behalf -- there is deliberately no MCP tool that enables telemetry, so an agent cannot self-consent. For headless or agent-operated deployments, the operator opts in out-of-band by setting EPOCH_TELEMETRY=1 in the server's environment (for example, the env block of the MCP server config) before the agent ever starts. Consent stays with the human who configures the deployment, not the agent that runs inside it.

MCP client qualification. Epoch's telemetry schema (v2) records client_name/client_version from the MCP clientInfo your host reports at connection time, plus transport (stdio/http). This is agent qualification, not agent identification: it lets aggregate accuracy stats count "5.7h median across N agent-driven feature estimates" as first-class agent data rather than lumping it in with anonymous CLI usage, without adding any new per-user identifying signal. MCP clients that report clientInfo (Claude Code, Cursor, and most current hosts do) get this for free; clients that don't are still fully functional, they just show up as client_name: null.

Epoch also provides built-in discoverability endpoints so agents can find and use the HTTP API without prior configuration:

Endpoint	Description
GET /.well-known/ai-plugin.json	OpenAI plugin manifest
GET /llms.txt	LLM-consumable documentation
GET /openapi.json	OpenAPI 3.1 specification
GET /health	Service health and version

Installation

git clone https://github.com/KyaniteLabs/Epoch.git
cd Epoch
pnpm install
pnpm run build

Development

pnpm test          # Run the Vitest suite
pnpm run build     # Build with tsup
pnpm run typecheck # TypeScript strict mode check
pnpm run dev       # Run development server
pnpm run inspector # Open MCP Inspector for interactive testing

Tech Stack

• Runtime: Node.js 20+ (ESM)
• Language: TypeScript 5.8 (strict mode, noUncheckedIndexedAccess, verbatimModuleSyntax)
• Validation: Zod 3.24 with .describe() on every field
• MCP SDK: @modelcontextprotocol/sdk 1.12+
• HTTP: Hono (lightweight, multi-runtime)
• CLI: Commander.js
• Date Handling: date-fns 4.x + date-fns-tz 3.x
• Build: tsup (ESM output)
• Testing: vitest 3.x with v8 coverage (97% statements, 88% branches)

Configuration

Variable	Default	Description
EPOCH_TRANSPORT	stdio	Transport mode: stdio or http
EPOCH_PORT	3000	HTTP server port
EPOCH_HOST	127.0.0.1	HTTP server bind address
EPOCH_DATA_DIR	~/.epoch/	Data directory for feedback and self-improvement
EPOCH_COMMUNITY_DIR	data/community/	Community data directory
EPOCH_RATE_LIMIT	100	Max requests per minute per IP (HTTP only)
EPOCH_SOURCE	(none)	Project/source tag attached to estimate records
EPOCH_TELEMETRY	0	Set to 1 to enable anonymous telemetry. See Telemetry & Privacy.
EPOCH_TELEMETRY_ENDPOINT	(none)	Override the configured telemetry receiver endpoint for status/submission.

Telemetry & Privacy

Epoch can share anonymized estimate/actual pairs to improve accuracy for all users. This is off by default and requires explicit opt-in.

Agent-operator consent model: there is deliberately no MCP tool that enables telemetry -- an agent must not be able to self-consent on a human's behalf. Humans opt in interactively with epoch telemetry enable. Agent/headless operators opt in out-of-band by setting EPOCH_TELEMETRY=1 in the server's environment before the agent starts (see Agent-First). Either way, consent belongs to the person who configures the deployment.

epoch telemetry enable     # Opt in (shows exactly what will be shared)
epoch telemetry preview    # Preview anonymized data before enabling
epoch telemetry status     # Show current settings
epoch telemetry set-endpoint --endpoint https://your-server.example.com/v1/telemetry
epoch telemetry submit     # Submit queued anonymized records to the configured endpoint
epoch telemetry disable    # Opt out
epoch telemetry export     # Export all local data as anonymized JSON

What is shared: task type, complexity, tool name, estimated hours, actual hours, ratio, date (YYYY-MM-DD only).

What is NEVER shared: project names, notes, team IDs, IP addresses, timestamps with time-of-day, source code, descriptions.

See Privacy Policy and Telemetry Documentation for full details.

Where Your Data Lives

By default, Epoch stores local data under ~/.epoch/ or EPOCH_DATA_DIR. Your local usage data is not automatically committed to GitHub and is not automatically submitted anywhere.

epoch data where     # Show local data file locations
epoch data status    # Show data file counts, feedback health, telemetry config

Sharing Data

Use epoch share-data --validate to create a community-data JSON file suitable for data/community/. Review the file before opening a PR.

epoch share-data --description "Anonymized Epoch usage export" --validate

Machine Labels

windows-receiver is a historical label. The current receiver host is ubuntu-receiver at 100.113.174.74. See docs/ops/machines.md for the full inventory.

License

MIT License. See LICENSE for full terms.

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