pctx — MCP Aggregation & Code Mode Execution#

What is pctx?#

pctx is a local server that:

1. Aggregates MCP servers — connects to Linear, GitHub, and other MCP backends behind one endpoint
2. Code Mode — instead of sequential tool calls, agents write TypeScript that runs in a Deno sandbox; only the result comes back (up to 98% token reduction on complex workflows)

Live endpoint: http://127.0.0.1:8080/mcp Connected MCPs: Linear (42 tools), GitHub (41 tools) Config: ~/.config/pctx/pctx.json Logs: /tmp/pctx.log | /tmp/pctx.err

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When to use#

• Agent needs to call Linear or GitHub tools via MCP
• Agent is doing multi-step tool workflows (pctx batches them into one TypeScript call)
• Any workflow where sequential tool calls return large intermediate payloads

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Quick Start#

bash

# Check if pctx is running
{baseDir}/pctx-skill.sh status

# List connected MCP servers + tool counts
{baseDir}/pctx-skill.sh mcp-list

# Test a tool call
{baseDir}/pctx-skill.sh test linear linear_getOrganization
{baseDir}/pctx-skill.sh test github list_issues

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Commands#

Daemon Management#

bash

# Status — shows port, uptime
{baseDir}/pctx-skill.sh status

# Start daemon (launchd)
{baseDir}/pctx-skill.sh start

# Stop daemon
{baseDir}/pctx-skill.sh stop

# Restart
{baseDir}/pctx-skill.sh restart

MCP Server Management#

bash

# List all connected MCPs + tool counts + connection health
{baseDir}/pctx-skill.sh mcp-list

# Add an upstream MCP — examples:
# stdio MCP with npm package
{baseDir}/pctx-skill.sh mcp-add memory --command "npx" --arg "-y" --arg "@modelcontextprotocol/server-memory"

# stdio MCP with installed binary
{baseDir}/pctx-skill.sh mcp-add linear --command "mcp-linear" --env "LINEAR_API_TOKEN=your_token"

# HTTP MCP
{baseDir}/pctx-skill.sh mcp-add stripe https://mcp.stripe.com

# Remove an MCP
{baseDir}/pctx-skill.sh mcp-remove <name>

Config & Backup#

bash

# Backup pctx.json (always done automatically before mcp-add/remove)
{baseDir}/pctx-skill.sh config-backup

# Restore from backup (interactive if no timestamp given)
{baseDir}/pctx-skill.sh config-restore
{baseDir}/pctx-skill.sh config-restore 20260422-092733

Testing#

bash

# Test a specific MCP tool via pctx
{baseDir}/pctx-skill.sh test linear linear_getOrganization
{baseDir}/pctx-skill.sh test linear linear_getTeams
{baseDir}/pctx-skill.sh test github list_issues
{baseDir}/pctx-skill.sh test github get_file_contents

Install (idempotent)#

bash

# Run on new VMs or after full rollback
{baseDir}/install.sh

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Calling pctx from Agent Code#

The pctx server exposes an MCP endpoint at http://127.0.0.1:8080/mcp. Agents can call tools directly via JSON-RPC, or use Code Mode for batched TypeScript execution.

Simple tool call via curl#

bash

# Initialize + get session context
curl -s -X POST http://127.0.0.1:8080/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"my-agent","version":"1.0"}}}'

# Call a tool (Code Mode — batched TypeScript)
curl -s -X POST http://127.0.0.1:8080/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: text/event-stream" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"execute_typescript","arguments":{"script":"const org = await linear.linear_getOrganization({}); const teams = await linear.linear_getTeams({}); return { org, teams };"}}}'

Code Mode — batch multiple calls#

The execute_typescript tool is the key feature. Write one script wrapped in async function run() that calls all tools needed:

Important: field name is code (not script). Code must be wrapped in async function run() { ... }.

Namespaces: Linear (capital L), Github (capital G, no 'b').

typescript

// BAD — multiple round-trips (traditional MCP)
const org = await Linear.linearGetOrganization({});
// ... agent receives result, burns tokens ...
const teams = await Linear.linearGetTeams({});
// ... agent receives result, burns tokens ...

// GOOD — one Code Mode call, one result
async function run() {
  const org = await Linear.linearGetOrganization({});
  const teams = await Linear.linearGetTeams({});
  const issues = await Linear.linearSearchIssues({ query: "urgent" });
  return JSON.stringify({ org, teams, issues }, null, 2);
}

// GitHub example
async function run() {
  const branches = await Github.listBranches({ owner: "MJM-Agents", repo: "rolling-reno-theme" });
  return JSON.stringify(branches, null, 2);
}

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Currently Connected MCPs#

NameBinaryTransportAuthToolslinearmcp-linearstdioLINEAR_API_TOKEN42githubgithub-mcp-server stdiostdioGITHUB_PERSONAL_ACCESS_TOKEN41

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Rollback#

Full rollback instructions: ROLLBACK-MCP-PCTX.md in workspace root.

Quick rollback — remove one MCP:

bash

{baseDir}/pctx-skill.sh mcp-remove linear   # removes Linear, leaves GitHub
{baseDir}/pctx-skill.sh mcp-remove github   # removes GitHub, leaves Linear

Full nuclear rollback:

bash

{baseDir}/pctx-skill.sh stop
brew uninstall pctx github-mcp-server
npm uninstall -g @tacticlaunch/mcp-linear
rm -rf ~/.config/pctx/ ~/Library/LaunchAgents/ai.openclaw.pctx.plist

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Config#

VariableDefaultDescriptionPCTX_CONFIG``~/.config/pctx/pctx.jsonPath to pctx configPCTX_PORT``8080Port pctx listens onPCTX_HOST``127.0.0.1Host pctx binds toPCTX_BINauto-detectedPath to pctx binary

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Notes#

• pctx.json is chmod 600 — contains API keys, never commit
• Deno sandbox: 10s execution timeout, no filesystem/env/system access
• OAuth not yet supported in pctx (v0.7.1) — remote Linear/GitHub MCPs require OAuth; use stdio/local for now
• Config auto-backed-up before every mcp-add / mcp-remove
• PAT registered under mjm-dex GitHub account — swap if needed