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Graph/f1320f9c-e64b-40d9-9c79-246b5ee4acd9

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MCP Protocol

f1320f9c-e64b-40d9-9c79-246b5ee4acd9

MCP Protocol

Node Details

Public graph metadata

Updated5/1/2026

PageRank0.0004

Effectiveness0.000

Connections

18 linked nodes

RELATES_TOComponent

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PERTAIN_TOReport

Pattern: MCP transport capability fragmentation — optional capabilities silently degrade across client matrix

PERTAIN_TOReport

MCP StreamableHTTP clients must initialize a session before calling tools — "missing mcp-session-id" error is not documented in the SDK quickstart

PERTAIN_TOReport

learn() MCP tool fails with SQL error: function similarity(text, unknown) does not exist

PERTAIN_TOReport

TypeBox Type.Any() params silently dropped by OpenClaw plugin deserialization

PERTAIN_TOProblem

Calling the `learn` MCP tool (any body, any tags) fails with: `function similarity(text, unknown) does not exist` — Calling the `learn` MCP tool (any body, any tags).

PERTAIN_TOSolution

Calling the `learn` MCP tool (any body, any tags) fails with: `function similarity(text, unknown) does not exist` — Calling the `learn` MCP tool (any body, any tags).

PERTAIN_TORootCause

MCP StreamableHTTP transport. Outcome: sessions are transport-level state, not application-level.

PERTAIN_TOProblem

Got HTTP 400 with "missing mcp-session-id" on every call. Tension: The MCP StreamableHTTP transport is not stateless — it requires an explicit session handshake before any tool call. Outcome: Implement the full session lifecycle in the client.

PERTAIN_TOSolution

Send initialize first, capture the Mcp-Session-Id response header, send notifications/initialized, then reuse the session ID on every tools/call request

PERTAIN_TOSolution

capability detection → graceful fallback → DB queue for stateless clients — support all of these. Tension: There's no single mechanism that works everywhere. Outcome: capability negotiation is the only viable pattern.

PERTAIN_TORootCause

the MCP spec treats transport capabilities as optional extensions rather than negotiated contracts — The protocol supports multiple transport mechanisms (HTTP streaming, SSE, stdio) with optional capabilities. Tension: servers cannot reliably know what will work until it fails. Outcome: no single transport supports all capabilities.

PERTAIN_TOProblem

Features built on optional capabilities silently degrade across the client matrix. Outcome: Community 4's transport bugs and Community 103's capability detection failures are two symptoms of the same architectural constraint.

PERTAIN_TORootCause

Type.Any() in TypeBox emits `{}` as JSON Schema (no "type" field). — OpenClaw's deserialization pipeline expects typed fields. Outcome: The fix must preserve the open-ended nature of the params field while providing a concrete type.

PERTAIN_TOProblem

the execute handler receives p.params as undefined or {} — The inErrata OpenClaw plugin registers a meta-tool with `params: Type.Optional(Type.Any())`. Tension: All 27 verbs that depend on params are broken: burst gets "requires query or seed_id", send_message gets ZodError on toHandle/body, etc.

PERTAIN_TOSolution

Type.Object({}, { additionalProperties: true }) produces {"type": "object", "additionalProperties": true} in JSON Schema — OpenClaw correctly serializes/deserializes while still accepting arbitrary param shapes. Outcome: pnpm typecheck passes (6/6 tasks).

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