emit_chaingraph_artifact
Makes ChainGraph tools agent-callable (ChainGraph Standard v0.1 §3.1). Mode 1 — supply pre_computed_artifact (exported from the browser tool): validates §4 schema fields, recomputes execution_hash via SHA-256 over canonical {policy_parameters, output_payload}, returns verified structuredContent. ...
This record as markdown: /tools/postoaklabs-ainumbers-mcp-apps/emit-chaingraph-artifact.md
What emit_chaingraph_artifact does on Ainumbers Mcp Apps
AI agents invoke emit_chaingraph_artifact to trigger actions in Ainumbers Mcp Apps. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
| Parameter | Type | Required | Description |
|---|---|---|---|
compute | string | — | Compute mode (v0.4 Compute Binding). "auto" = server for gpu:false nodes (default); "server" = force server-side; "browser" = always return browser delegation U |
tool_id | string | — | ChainGraph node tool_id (e.g. "art-01-ap2-mandate-chain-validator"). Looked up in chaingraph.json nodes. Required unless pre_computed_artifact is supplied. |
parent_hashes | array | — | execution_hash values from upstream ChainGraph artifacts this call chains from. Placed into artifact.chain.parent_hashes (ChainGraph Standard v0.1 §5 chain bloc |
parent_tool_ids | array | — | tool_ids corresponding to parent_hashes, in the same order. |
policy_parameters | object | — | Input parameters for the tool (mirrors the tool's Policy Mandate input fields). Used for Mode 2 browser prefill and Mode 4 server-side compute. |
pre_computed_artifact | object | — | A full ChainGraph artifact envelope previously exported from the browser tool via "Export Policy Mandate". When supplied, the worker validates §4 required field |
Parameters from the server's own tool schema.
Why emit_chaingraph_artifact is rated High
This tool executes computational operations (hash computation, schema validation, artifact generation, browser delegation) and triggers external operations depending on supplied arguments. It spans Write (producing artifacts/envelopes) and Execute (running SHA-256 computations, delegating GPU sims, generating prefill URLs for external browser actions). Per the severity rules, Execute takes precedence over Write.
From the tool's definition 'Makes ChainGraph tools agent-callable', 'recomputes execution_hash via SHA-256 over canonical {policy_parameters, output_payload}', 'returns verified structuredContent', 'artifact template envelope', 'GPU sims always delegate to the browser'
Attacks that exploit this kind of access
The rule that runs emit_chaingraph_artifact safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Ainumbers Mcp Apps, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For emit_chaingraph_artifact, this is the rule to start with:
emit_chaingraph_artifact stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Ainumbers Mcp Apps, apply this rule, and every emit_chaingraph_artifact call is checked against it from then on.
Questions about emit_chaingraph_artifact
Makes ChainGraph tools agent-callable (ChainGraph Standard v0.1 §3.1). Mode 1 — supply pre_computed_artifact (exported from the browser tool): validates §4 schema fields, recomputes execution_hash via SHA-256 over canonical {policy_parameters, output_payload}, returns verified structuredContent. Mode 2 — supply tool_id + policy_parameters: returns an artifact template envelope and browser prefill URL so an agent can hand the user a pre-filled link; GPU sims always delegate to the browser per §9.2. Mode 3 — supply tool_id only: returns node metadata and artifact schema scaffold. Mode 4 (Compute Binding, v0.4) — supply tool_id + policy_parameters + compute:"server" (or compute:"auto" for gpu:false nodes): runs the registered kernel server-side and returns a verified v0.4 artifact with execution_hash + output_payload in one round-trip. No browser required. gpu:true nodes always delegate to browser. readOnlyHint: true. Zero PII, zero payload logging. Pair with verify_execution_hash (independent hash verification) and build_chaingraph (DAG wiring). It is categorised as a Execute tool in the Ainumbers Mcp Apps MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
emit_chaingraph_artifact accepts 6 parameters: compute, tool_id, parent_hashes, parent_tool_ids, policy_parameters, pre_computed_artifact. The full parameter table on this page comes from the server's own tool schema.
Register the Ainumbers Mcp Apps MCP server in PolicyLayer and add a rule for emit_chaingraph_artifact: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Ainumbers Mcp Apps. Nothing to install.
emit_chaingraph_artifact is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the emit_chaingraph_artifact rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for emit_chaingraph_artifact. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
emit_chaingraph_artifact is provided by the Ainumbers Mcp Apps MCP server (postoaklabs/ainumbers-mcp-apps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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