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feat(server): in-server MCP endpoint over Streamable HTTP (rmcp), RFC-003

Browse source 
Adds POST /mcp: a stateless, JSON-only MCP (Model Context Protocol) endpoint
served by rmcp 1.7's StreamableHttpService, mounted inside per_graph_protected
so it inherits the bearer-auth and graph-handle middleware (single mode serves
/mcp; multi mode nests it to /graphs/{graph_id}/mcp).

rmcp's stateless mode (stateful_mode=false, json_response=true) provides
GET/DELETE 405, loopback Host validation, and MCP-Protocol-Version checking
(400 on unsupported, default 2025-03-26) without extra code. The handler
advertises the tools capability and answers the initialize handshake; the
tool catalog, resources, and stored-query projection land in the following
phases. Auth stays decoupled (RFC-003 5.8): the handler consumes the
already-resolved ResolvedActor and branches on nothing about how the token
was verified.

Tests (tests/server.rs): initialize handshake, GET 405, and bearer required
(401 without a token, 200 with). The docs/user/server.md MCP section is
deferred to the docs phase per the RFC-003 rollout, since the endpoint
exposes an empty tool list until the tools phase.

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Ragnor Comerford 2026-06-08 15:27:01 +02:00
parent 69fae71870
commit 9df9f394c0
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5 changed files with 321 additions and 5 deletions
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@ -25,7 +25,7 @@ checksum = "b169f7a6d4742236a0a00c541b845991d0ac43e546831af1249753ab4c3aa3a0"
dependencies = [
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"cipher",
"cpufeatures",
"cpufeatures 0.2.17",
]
[[package]]
@ -1085,7 +1085,7 @@ dependencies = [
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"constant_time_eq",
"cpufeatures",
"cpufeatures 0.2.17",
]
[[package]]
@ -1278,6 +1278,17 @@ version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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]
[[package]]
name = "chrono"
version = "0.4.44"
@ -1487,6 +1498,15 @@ dependencies = [
"libc",
]
[[package]]
name = "cpufeatures"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
dependencies = [
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[[package]]
name = "crc32c"
version = "0.6.8"
@ -2750,6 +2770,7 @@ dependencies = [
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"libc",
"r-efi 6.0.0",
"rand_core 0.10.1",
"wasip2",
"wasip3",
]
@ -3423,7 +3444,7 @@ version = "0.1.6"
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dependencies = [
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[[package]]
@ -4657,6 +4678,7 @@ dependencies = [
"omnigraph-engine",
"omnigraph-policy",
"regex",
"rmcp",
"serde",
"serde_json",
"serde_yaml",
@ -4793,6 +4815,12 @@ version = "1.0.15"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "path_abs"
version = "0.5.1"
@ -5309,6 +5337,17 @@ dependencies = [
"rand_core 0.9.5",
]
[[package]]
name = "rand"
version = "0.10.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d2e8e8bcc7961af1fdac401278c6a831614941f6164ee3bf4ce61b7edb162207"
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[[package]]
name = "rand_chacha"
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@ -5347,6 +5386,12 @@ dependencies = [
"getrandom 0.3.4",
]
[[package]]
name = "rand_core"
version = "0.10.1"
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[[package]]
name = "rand_distr"
version = "0.5.1"
@ -5579,6 +5624,35 @@ dependencies = [
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]
[[package]]
name = "rmcp"
version = "1.7.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0810a9f717d9828f475fe1f629f4c305c8464b7f496c3a854b58d29e65f4058e"
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"uuid",
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[[package]]
name = "roaring"
version = "0.11.3"
@ -5816,12 +5890,26 @@ version = "1.2.1"
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version = "1.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "scoped-tls"
version = "1.0.1"
@ -5926,6 +6014,17 @@ dependencies = [
"syn 2.0.117",
]
[[package]]
name = "serde_derive_internals"
version = "0.29.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"proc-macro2",
"quote",
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[[package]]
name = "serde_json"
version = "1.0.149"
@ -6051,7 +6150,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
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@ -6062,7 +6161,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -6241,6 +6340,19 @@ dependencies = [
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[[package]]
name = "stable_deref_trait"
version = "1.2.1"