a4sx sessions
Search coding-agent sessions and load one as starting context; save your own to your library.
Should I use this
Quality & Safety
Findings (1)
- LOWTool 'fetch_session_context' suggests web access but openWorldHint=falsein fetch_session_context
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"sessions": {
"url": "https://session-exchange.com/mcp"
}
}
}Remote endpoints
https://session-exchange.com/mcpstreamable-httpWhat it can do
Tool inventory
Tools (7)
🟢search_sessions(query, scope, tags, sort, limit, ...)
Search vetted, published coding-agent sessions on a4sx (reviewed marketplace listings), or your own saved sessions with scope=library. Returns ids to use with the other tools.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"maxLength": 200,
"description": "Free-text search. Empty = browse."
},
"scope": {
"type": "string",
"enum": [
"public",
"library"
],
"default": "public",
"description": "`public`: vetted marketplace listings (no sign-in needed). `library`: your own saved sessions (needs library:read)."
},
"tags": {
"type": "array",
"items": {
"type": "string",
"maxLength": 64
},
"maxItems": 10
},
"sort": {
"type": "string",
"enum": [
"relevance",
"imports",
"rating",
"recent"
],
"default": "relevance"
},
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 50,
"default": 10
},
"offset": {
"type": "integer",
"minimum": 0,
"maximum": 10000,
"default": 0
},
"harness": {
"type": "array",
"maxItems": 5,
"items": {
"type": "string",
"enum": [
"claude-code",
"codex-cli",
"gemini-cli",
"opencode",
"unknown"
]
},
"description": "Only sessions recorded with these harnesses (claude-code, codex-cli, gemini-cli, opencode; unknown = not identified). Only Claude Code sessions can be resumed today; the others are view & buy."
}
},
"additionalProperties": false
}🟢get_session_summary(id, source, tenant)
Describe one session before using it: what it did, outline, price, and whether you already have access. source=marketplace (default) or library.
Input Schema
{
"type": "object",
"properties": {
"id": {
"type": "string",
"minLength": 1,
"maxLength": 200,
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:@-]*$"
},
"source": {
"type": "string",
"enum": [
"marketplace",
"library"
],
"default": "marketplace"
},
"tenant": {
"type": "string",
"maxLength": 64,
"pattern": "^[a-z0-9-]*$",
"description": "Owning workspace of a marketplace listing (from search results). Optional."
}
},
"required": [
"id"
],
"additionalProperties": false
}🟡acquire_session(id, tenant, version)
Add a marketplace session you are entitled to (free, bought, or granted) to your private library. Never buys anything: for a paid listing it returns status=payment_required with the price and the listing URL.
Input Schema
{
"type": "object",
"properties": {
"id": {
"type": "string",
"minLength": 1,
"maxLength": 200,
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:@-]*$",
"description": "Marketplace listing id (from search_sessions)."
},
"tenant": {
"type": "string",
"maxLength": 64,
"pattern": "^[a-z0-9-]*$",
"description": "Owning workspace of a marketplace listing (from search results). Optional."
},
"version": {
"type": "string",
"maxLength": 64,
"pattern": "^[A-Za-z0-9._-]*$",
"default": "latest"
}
},
"required": [
"id"
],
"additionalProperties": false
}🟢fetch_session_context(id, version, max_tokens, include_tool_calls)
Load a session from your library (saved, or added with acquire_session) as starting context for this conversation, sized to max_tokens.
Input Schema
{
"type": "object",
"properties": {
"id": {
"type": "string",
"minLength": 1,
"maxLength": 200,
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:@-]*$",
"description": "Library id: one of your saved sessions, or the library_id acquire_session returned for a marketplace listing."
},
"version": {
"type": "string",
"maxLength": 64,
"pattern": "^[A-Za-z0-9._-]*$"
},
"max_tokens": {
"type": "integer",
"minimum": 500,
"maximum": 100000,
"default": 8000,
"description": "Context budget. Long sessions keep the opening request and the newest turns that fit; the middle is elided."
},
"include_tool_calls": {
"type": "boolean",
"default": false,
"description": "Add one-line stubs for tool calls and results."
}
},
"required": [
"id"
],
"additionalProperties": false
}🟡publish_session(transcript, content_sha256, title, label, parent, ...)
Save a session transcript (JSONL) to your private a4sx library. The server scrubs token-shaped secrets before storing. Private: it is never listed publicly by this tool.
Input Schema
{
"type": "object",
"properties": {
"transcript": {
"type": "string",
"minLength": 2,
"description": "The session transcript as JSONL (Claude Code format)."
},
"content_sha256": {
"type": "string",
"pattern": "^[0-9a-fA-F]{64}$",
"description": "Hex SHA-256 of the transcript's UTF-8 bytes; checked."
},
"title": {
"type": "string",
"maxLength": 200
},
"label": {
"type": "string",
"maxLength": 64
},
"parent": {
"type": "string",
"minLength": 1,
"maxLength": 200,
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:@-]*$",
"description": "Library id this session continues from (lineage)."
},
"visibility": {
"type": "string",
"enum": [
"private"
],
"default": "private",
"description": "Always private. Listing publicly is a separate step in the web app."
},
"client_scrubbed": {
"type": "boolean",
"description": "The client scrubbed before sending. The server scrubs again regardless."
},
"idempotency_key": {
"type": "string",
"minLength": 1,
"maxLength": 128,
"pattern": "^[\\x21-\\x7e]+$"
}
},
"required": [
"transcript"
],
"additionalProperties": false
}🟢request_purchase(id, tenant, version)
Start buying a paid marketplace listing for the account holder to confirm. Nothing is charged and you never pay: it returns a verify_url and a user_code to give to the account holder, who checks the code, confirms and pays. Then poll get_purchase_request.
Input Schema
{
"type": "object",
"properties": {
"id": {
"type": "string",
"minLength": 1,
"maxLength": 200,
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:@-]*$",
"description": "Marketplace listing id (from search_sessions)."
},
"tenant": {
"type": "string",
"maxLength": 64,
"pattern": "^[a-z0-9-]*$",
"description": "The listing's workspace (from search_sessions).",
"minLength": 1
},
"version": {
"type": "string",
"maxLength": 64,
"pattern": "^[A-Za-z0-9._-]*$",
"default": "latest",
"description": "The version you expect; must be the one on sale."
}
},
"required": [
"id",
"tenant"
],
"additionalProperties": false
}🟢get_purchase_request(purchase_request_id)
Status of a purchase you requested: pending, completed (with acquired_copy_id to load with fetch_session_context), declined or expired.
Input Schema
{
"type": "object",
"properties": {
"purchase_request_id": {
"type": "string",
"pattern": "^pr_[A-Za-z0-9_-]{10,64}$"
}
},
"required": [
"purchase_request_id"
],
"additionalProperties": false
}Community
Evidence