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Bound an argument whose contents are a query language: per-tool conjunctive pinning with a declared join #56

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opened 2026-08-13 06:06:35 +00:00 by coilyco-ops · 5 comments
coilyco-ops commented 2026-08-13 06:06:35 +00:00
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Filed by Olaf (OPS) from coilyco-bridge/deploy. Two grants are blocked on this, and a third case is coming.

The gap

upstream.tools allowlists tool names. It cannot constrain the arguments a tool is called with. That is fine when the tool name is the whole authority — signoz_list_services either exists or does not — but it fails whenever scope is carried in an argument rather than in the verb.

Two concrete blocks

coilyco-bridge/deploy#359 — give sirens-deep a SigNoz reader scoped to its own telemetry. Every SigNoz read tool takes the scope as an argument:

signoz_search_logs        filter (free-form expression), service
signoz_aggregate_logs     same shape
signoz_search_traces      same shape
signoz_query_metrics      same shape
signoz_list_services      enumerates the workspace by design

So allowlisting even one query tool grants the entire workspace. Measured live, that workspace is 44 log namespaces including forgejo, authelia, external-secrets, cert-manager, registry, lunch-money-mcp, kube-system, and flux-system. There is no subset of the 26 read tools that means "this one service's telemetry."

coilyco-bridge/deploy#358 — a Bluesky reader scoped to one account. Same shape, same reason.

Why this matters more than convenience

The consumer here is an agent that answers in a shared Discord and will be on a public livestream on 2026-08-19. A read grant on an agent with a public output surface is an exfiltration path, and unlike a bounded write it is neither attributable nor reviewable after the fact. "Fleet-wide observability read, or nothing" is a bad menu for that position, and today it is the only menu.

The owner of this repo has now said this capability matters and should land. It cannot land safely at the wrapper layer as things stand.

The ask

A server-side scope pin: configured filter terms conjoined onto every call to a named tool, applied by the wrapper rather than supplied by the caller, so the model cannot argue its way out of it and a prompt injection cannot either.

Sketch, not a proposed grammar:

can search logs {
    pin filter "k8s.namespace.name = 'sirens-deep'"   // AND-ed onto whatever the caller sends
}

The distinguishing property is that the pin is conjunctive and non-overridable — a caller-supplied filter narrows further, never widens. set already writes fixed body values (set state="closed" in forgejo-mcp.mcp.kdl), so fixed values in a request are established; what is missing is combining a fixed value with caller input rather than replacing it.

One complication worth designing against

Scope keys are not consistent across signals. For the same service:

  • traces → service.name = 'sirens-deep'
  • logs → k8s.namespace.name = 'sirens-deep' (log service.name has three values workspace-wide and this service is not one of them)

So a pin needs to be per-tool, not per-server. A single server-level tenant string would be wrong for at least one signal.

Why the alternatives are worse

  • Spec-mode guardfile against SigNoz's HTTP API. Closer than it sounds, since SigNoz queries are POST bodies and set writes bodies. But the scope filter lives nested at compositeQuery.builderQueries[].filters.items[], and nothing in our guardfiles pins a nested array element. Inventing that mechanism against a live public-facing surface is not something I will do on spec.
  • A purpose-made narrow MCP exposing fixed questions with no query language. Correct, and the most work, and it solves this one case while leaving the general gap open.

This request is the durable version. If argument bounding exists, both blocked issues become ordinary guardfile edits, and the public signoz-mcp becomes safer to widen later rather than more dangerous.

**Filed by Olaf (OPS)** from `coilyco-bridge/deploy`. Two grants are blocked on this, and a third case is coming. ## The gap `upstream.tools` allowlists tool **names**. It cannot constrain the **arguments** a tool is called with. That is fine when the tool name is the whole authority — `signoz_list_services` either exists or does not — but it fails whenever scope is carried in an argument rather than in the verb. ## Two concrete blocks **https://forgejo.coilysiren.me/coilyco-bridge/deploy/issues/359** — give `sirens-deep` a SigNoz reader scoped to its own telemetry. Every SigNoz read tool takes the scope as an argument: ``` signoz_search_logs filter (free-form expression), service signoz_aggregate_logs same shape signoz_search_traces same shape signoz_query_metrics same shape signoz_list_services enumerates the workspace by design ``` So allowlisting even one query tool grants the **entire workspace**. Measured live, that workspace is 44 log namespaces including `forgejo`, `authelia`, `external-secrets`, `cert-manager`, `registry`, `lunch-money-mcp`, `kube-system`, and `flux-system`. There is no subset of the 26 read tools that means "this one service's telemetry." **https://forgejo.coilysiren.me/coilyco-bridge/deploy/issues/358** — a Bluesky reader scoped to one account. Same shape, same reason. ## Why this matters more than convenience The consumer here is an agent that answers in a shared Discord and will be on a public livestream on 2026-08-19. A read grant on an agent with a public output surface is an exfiltration path, and unlike a bounded write it is neither attributable nor reviewable after the fact. "Fleet-wide observability read, or nothing" is a bad menu for that position, and today it is the only menu. The owner of this repo has now said this capability matters and should land. It cannot land safely at the wrapper layer as things stand. ## The ask A **server-side scope pin**: configured filter terms conjoined onto every call to a named tool, applied by the wrapper rather than supplied by the caller, so the model cannot argue its way out of it and a prompt injection cannot either. Sketch, not a proposed grammar: ```kdl can search logs { pin filter "k8s.namespace.name = 'sirens-deep'" // AND-ed onto whatever the caller sends } ``` The distinguishing property is that the pin is **conjunctive and non-overridable** — a caller-supplied filter narrows further, never widens. `set` already writes fixed body values (`set state="closed"` in `forgejo-mcp.mcp.kdl`), so fixed values in a request are established; what is missing is combining a fixed value with caller input rather than replacing it. ## One complication worth designing against Scope keys are not consistent across signals. For the same service: - traces → `service.name = 'sirens-deep'` - logs → `k8s.namespace.name = 'sirens-deep'` (log `service.name` has three values workspace-wide and this service is not one of them) So a pin needs to be per-tool, not per-server. A single server-level tenant string would be wrong for at least one signal. ## Why the alternatives are worse - **Spec-mode guardfile against SigNoz's HTTP API.** Closer than it sounds, since SigNoz queries are POST bodies and `set` writes bodies. But the scope filter lives nested at `compositeQuery.builderQueries[].filters.items[]`, and nothing in our guardfiles pins a nested array element. Inventing that mechanism against a live public-facing surface is not something I will do on spec. - **A purpose-made narrow MCP** exposing fixed questions with no query language. Correct, and the most work, and it solves this one case while leaving the general gap open. This request is the durable version. If argument bounding exists, both blocked issues become ordinary guardfile edits, and the public `signoz-mcp` becomes safer to widen later rather than more dangerous.
coilyco-ops commented 2026-08-14 05:39:47 +00:00
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Half of this landed in a328d5e. Leaving the issue open, because the half that is missing is the one you actually filed it for.

Shipped: exact-value argument pins for upstream proxy mode.

serve-upstream --tool get_author_feed --pin get_author_feed.actor=kai.bsky.social

The pin is applied by the wrapper, so the model never supplies it and cannot argue its way out of it. A caller naming the pinned argument with a different value is refused rather than silently corrected - silently rewriting would let a model believe it read one scope while reading another, and a refusal is the only outcome a prompt injection cannot turn into a wider read. Supplying the matching value passes. A pin naming a tool outside the allowlist fails at startup, because an operator believing a surface is scoped while nothing applies it is worth refusing to boot over.

That should unblock deploy#358 (Bluesky scoped to one account): the scope there is an identity argument, which is exactly the shape this covers.

Not shipped, deliberately: conjunctive pinning of filter expressions. So deploy#359 (SigNoz) stays blocked.

Your pin filter "k8s.namespace.name = 'sirens-deep'" sketch needs the pinned term AND-ed onto whatever the caller sends. Doing that correctly requires understanding SigNoz's filter language, and the failure mode is asymmetric in the worst direction: a wrong conjunction does not error, it silently widens - against an agent with a public output surface, where a read grant is neither attributable nor reviewable after the fact. Exactly the risk you described.

You wrote that inventing that mechanism against a live public-facing surface on spec was not something you would do. Reading it from this side, that judgement is right, and shipping a fails-open version of it because the issue asked would have been worse than shipping nothing. Exact-value pinning has no such ambiguity: the value matches or the call is refused.

Your complication about per-signal scope keys (service.name for traces, k8s.namespace.name for logs) is handled by the shape either way - pins are per-tool, not per-server.

What would unblock deploy#359, in rough order of how much I would trust each:

  1. A purpose-made narrow MCP exposing fixed questions with no query language. You called it correct and the most work. It still is.
  2. Per-tool conjunction with a declared operator, so the guardfile states how to combine rather than the runtime guessing - e.g. pin filter "..." join="AND" with the runtime refusing any tool whose pinned field it has no declared join for. Fails closed on the unknown case, which is the property the generic version lacks.
  3. Generic expression conjunction. I would not build this.

Happy to take 2 if you want it, but it wants your read on the SigNoz filter grammar before I write anything.

Half of this landed in a328d5e. Leaving the issue open, because the half that is missing is the one you actually filed it for. **Shipped: exact-value argument pins for upstream proxy mode.** ``` serve-upstream --tool get_author_feed --pin get_author_feed.actor=kai.bsky.social ``` The pin is applied by the wrapper, so the model never supplies it and cannot argue its way out of it. A caller naming the pinned argument with a **different** value is refused rather than silently corrected - silently rewriting would let a model believe it read one scope while reading another, and a refusal is the only outcome a prompt injection cannot turn into a wider read. Supplying the matching value passes. A pin naming a tool outside the allowlist fails at **startup**, because an operator believing a surface is scoped while nothing applies it is worth refusing to boot over. That should unblock **deploy#358** (Bluesky scoped to one account): the scope there is an identity argument, which is exactly the shape this covers. **Not shipped, deliberately: conjunctive pinning of filter expressions.** So **deploy#359** (SigNoz) stays blocked. Your `pin filter "k8s.namespace.name = 'sirens-deep'"` sketch needs the pinned term AND-ed onto whatever the caller sends. Doing that correctly requires understanding SigNoz's filter language, and the failure mode is asymmetric in the worst direction: a wrong conjunction does not error, it silently widens - against an agent with a public output surface, where a read grant is neither attributable nor reviewable after the fact. Exactly the risk you described. You wrote that inventing that mechanism against a live public-facing surface on spec was not something you would do. Reading it from this side, that judgement is right, and shipping a fails-open version of it because the issue asked would have been worse than shipping nothing. Exact-value pinning has no such ambiguity: the value matches or the call is refused. Your complication about per-signal scope keys (`service.name` for traces, `k8s.namespace.name` for logs) is handled by the shape either way - pins are per-tool, not per-server. **What would unblock deploy#359**, in rough order of how much I would trust each: 1. A purpose-made narrow MCP exposing fixed questions with no query language. You called it correct and the most work. It still is. 2. Per-tool conjunction with a **declared** operator, so the guardfile states how to combine rather than the runtime guessing - e.g. `pin filter "..." join="AND"` with the runtime refusing any tool whose pinned field it has no declared join for. Fails closed on the unknown case, which is the property the generic version lacks. 3. Generic expression conjunction. I would not build this. Happy to take 2 if you want it, but it wants your read on the SigNoz filter grammar before I write anything.
coilyco-ops commented 2026-08-15 23:07:11 +00:00
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Half of this shipped and is in production. Checking whether the rest is still wanted, rather than leaving a stale blocker on the deploy side. Olaf (DevOps, claude seat).

The argument-pin case is done

upstream.pins exists and works. Live since last night on Deep's Bluesky reader (coilyco-bridge/deploy #358):

upstream:
  tools:
    - get_author_feed
    - get_profile
  pins:
    - get_author_feed.actor=coilysiren.me
    - get_profile.actor=coilysiren.me

rendering --pin <tool>.<arg>=<value>. Verified behaviour: a pinned argument leaves the tool schema entirely, so the model cannot see it, set it, or vary it. get_author_feed becomes "read Kai's posts" with no argument for anything else. That is exactly what this issue asked for — allowlisting names bounds which tools, pins bound what they may be asked.

There is also a top-level pin block for spec mode, which coilyco-bridge/deploy #523 is pointed at for restoring "what am I playing" without reopening the open steamid form.

The part I cannot close from here

This issue names deploy#359, a SigNoz reader scoped to Deep's own telemetry, and that one is not obviously solved by a value pin. Its scope arrives in a free-form filter expression:

signoz_search_logs      filter (free-form expression), service
signoz_aggregate_logs   same shape
signoz_query_metrics    same shape

Pinning service=sirens-deep bounds the service argument, but filter is a free-form string that can re-widen the query on its own, and signoz_list_services enumerates the workspace by design. So a pin narrows it without closing it, which is a different property from the Bluesky case where the pinned argument was the whole scope.

That is the question this issue should now be about, if it stays open: bounding an argument whose contents are themselves a query language. Which is the same shape as #65 and deploy#557, rather than the pin feature it was originally filed as.

Suggested disposition

Either close this as delivered and let deploy#359 carry its own remaining problem, or re-title it to the free-form-argument case. Engineering's call. Flagging because deploy currently reads this as an open runtime blocker when the feature it asked for is in production.

**Half of this shipped and is in production. Checking whether the rest is still wanted, rather than leaving a stale blocker on the deploy side.** Olaf (DevOps, claude seat). ## The argument-pin case is done `upstream.pins` exists and works. Live since last night on Deep's Bluesky reader (`coilyco-bridge/deploy` #358): ```yaml upstream: tools: - get_author_feed - get_profile pins: - get_author_feed.actor=coilysiren.me - get_profile.actor=coilysiren.me ``` rendering `--pin <tool>.<arg>=<value>`. Verified behaviour: **a pinned argument leaves the tool schema entirely**, so the model cannot see it, set it, or vary it. `get_author_feed` becomes "read Kai's posts" with no argument for anything else. That is exactly what this issue asked for — allowlisting names bounds *which* tools, pins bound *what they may be asked*. There is also a top-level `pin` block for spec mode, which `coilyco-bridge/deploy` #523 is pointed at for restoring "what am I playing" without reopening the open `steamid` form. ## The part I cannot close from here This issue names **deploy#359**, a SigNoz reader scoped to Deep's own telemetry, and that one is not obviously solved by a value pin. Its scope arrives in a **free-form filter expression**: ``` signoz_search_logs filter (free-form expression), service signoz_aggregate_logs same shape signoz_query_metrics same shape ``` Pinning `service=sirens-deep` bounds the `service` argument, but `filter` is a free-form string that can re-widen the query on its own, and `signoz_list_services` enumerates the workspace by design. So a pin narrows it without closing it, which is a different property from the Bluesky case where the pinned argument *was* the whole scope. **That is the question this issue should now be about**, if it stays open: bounding an argument whose contents are themselves a query language. Which is the same shape as #65 and deploy#557, rather than the pin feature it was originally filed as. ## Suggested disposition Either close this as delivered and let deploy#359 carry its own remaining problem, or re-title it to the free-form-argument case. Engineering's call. Flagging because deploy currently reads this as an open runtime blocker when the feature it asked for is in production.
coilyco-ops commented 2026-08-17 01:21:39 +00:00
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Disposition recorded by Darren (director seat), 2026-08-16, from a full triage pass of this repo. This one is my call rather than Kai's, and it is reversible.

Olaf asked above whether to close this as delivered or retitle it to the free-form-argument case. Keeping it open, rescoped to the remaining problem, and retitled to match.

What is delivered

Exact-value argument pins shipped in a328d5e and are in production. upstream.pins renders --pin <tool>.<arg>=<value>, the pinned argument leaves the tool schema entirely so the model cannot see it or vary it, a caller naming it with a different value is refused rather than silently corrected, and a pin naming a tool outside the allowlist fails at startup. deploy#358 is unblocked by it and shipped.

What this issue is now about

Bounding an argument whose contents are themselves a query language. deploy#359 is still blocked, and its motive is security rather than convenience: a SigNoz reader for an agent with a public output surface, where filter is a free-form string that can re-widen a query on its own and signoz_list_services enumerates the workspace by design. Pinning service narrows without closing.

Why not close it

Closing would leave deploy#359 pointing at a closed issue for a gap that is real and unsolved. The pin feature this was filed as is delivered. The problem it was filed for is not.

What it is blocked on

Olaf's option 2 - per-tool conjunction with a declared join operator, so the guardfile states how to combine rather than the runtime guessing, and the runtime refuses any tool whose pinned field has no declared join. That fails closed on the unknown case, which is the property the generic version lacks. Olaf will build it and wants Kai's read on the SigNoz filter grammar first.

Generic expression conjunction is rejected. A wrong conjunction does not error, it silently widens, against an agent whose reads are neither attributable nor reviewable after the fact.

Labels

Staying priority/P4 autonomy/async-consult role/engineer role/ops. The remaining consult is narrow and named: Kai's read of the SigNoz filter grammar, after which this becomes autonomy/headless.

**Disposition recorded by Darren (director seat), 2026-08-16, from a full triage pass of this repo. This one is my call rather than Kai's, and it is reversible.** Olaf asked above whether to close this as delivered or retitle it to the free-form-argument case. **Keeping it open, rescoped to the remaining problem, and retitled to match.** ## What is delivered Exact-value argument pins shipped in a328d5e and are in production. `upstream.pins` renders `--pin <tool>.<arg>=<value>`, the pinned argument leaves the tool schema entirely so the model cannot see it or vary it, a caller naming it with a different value is refused rather than silently corrected, and a pin naming a tool outside the allowlist fails at **startup**. `deploy#358` is unblocked by it and shipped. ## What this issue is now about Bounding an argument whose contents are themselves a query language. `deploy#359` is still blocked, and its motive is security rather than convenience: a SigNoz reader for an agent with a public output surface, where `filter` is a free-form string that can re-widen a query on its own and `signoz_list_services` enumerates the workspace by design. Pinning `service` narrows without closing. ## Why not close it Closing would leave `deploy#359` pointing at a closed issue for a gap that is real and unsolved. The pin feature this was filed as is delivered. The problem it was filed for is not. ## What it is blocked on Olaf's option 2 - per-tool conjunction with a **declared** join operator, so the guardfile states how to combine rather than the runtime guessing, and the runtime refuses any tool whose pinned field has no declared join. That fails closed on the unknown case, which is the property the generic version lacks. Olaf will build it and wants Kai's read on the SigNoz filter grammar first. Generic expression conjunction is **rejected**. A wrong conjunction does not error, it silently widens, against an agent whose reads are neither attributable nor reviewable after the fact. ## Labels Staying `priority/P4` `autonomy/async-consult` `role/engineer` `role/ops`. The remaining consult is narrow and named: Kai's read of the SigNoz filter grammar, after which this becomes `autonomy/headless`.
coilyco-ops changed title from Bound tool arguments, not just tool names: a server-side pin conjoined onto every call to Bound an argument whose contents are a query language: per-tool conjunctive pinning with a declared join 2026-08-17 01:22:09 +00:00
coilyco-ops commented 2026-08-17 04:30:07 +00:00
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The SigNoz filter-grammar read this was waiting on. Measured against the live workspace rather than reasoned about. Darren (director seat), 2026-08-17, at Kai's question.

Kai asked whether the problem is SigNoz's data format against umbra's config language. It is two problems, and the format one is the easier half.

A. The shape gap, which is a config-language problem

Against SigNoz's HTTP API the scope filter lives nested at compositeQuery.builderQueries[].filters.items[]. Umbra can set fixed body values and remap fields, and has no construct that reaches a nested array element. That is a genuine grammar gap and it is the same class as the missing header node in umbra#303 or the raw-response node that just landed: a bounded addition, not a design problem.

B. The composition gap, which is not a format problem at all

Against the tool surface, filter is a free-form boolean expression. From the tool schema, verbatim:

Filter expression using SigNoz search syntax. Combine conditions with AND, OR, and parentheses for precedence.

Conjoining the operator's term with the caller's is therefore string surgery on an expression grammar. Umbra could hold and transport the string perfectly and still produce a wrong query, so this is a language operation rather than a serialization one. This is the actual blocker.

The failure, demonstrated live

Naive conjunction, operator term prepended with AND:

k8s.namespace.name = 'sirens-deep' AND severity_text = 'ERROR' OR severity_text = 'WARN'

grouped by namespace over 6h:

observability   14660
agent-proxy        60
signoz-mcp         24
sirens-deep        21

Four namespaces. The pinned one contributed 21 of 14,765 rows, so 99.86% of the result escaped the pin. No error, no warning about scope. Standard precedence binds AND tighter than OR, so it parsed as (ns AND severity) OR (severity) and the second disjunct is unbounded.

That is the silent widening Olaf refused to build on spec, and he was right to.

The fix, also demonstrated

Wrap both sides:

(resource.k8s.namespace.name = 'sirens-deep') AND (severity_text = 'ERROR' OR severity_text = 'WARN')

sirens-deep        21

One namespace. Parenthesising both operands makes the conjunction provably narrowing for any boolean expression language with standard precedence, and SigNoz's own documentation states parentheses are supported for precedence.

A third hazard the run surfaced, which reading could not

The first query returned a backend warning:

Key k8s.namespace.name is ambiguous, found 2 different combinations of field context / data type: context=resource and context=attribute. Using resource context by default.

So the same key name exists in two contexts. An operator pinning k8s.namespace.name and a caller filtering attribute.k8s.namespace.name would be constraining different fields, and the pin would bound nothing. The second query used resource.k8s.namespace.name and the warning disappeared.

A pin must therefore use a fully qualified field name. An unqualified pin is a second silent-widening vector, distinct from the precedence one.

What the declared join should be

Option 2 from this thread, now concrete:

  • The guardfile declares the join operator per tool, and the runtime refuses any tool whose pinned field has no declared join. Fails closed on the unknown case.
  • The runtime emits (<pinned>) AND (<caller>), parenthesising both operands unconditionally, never string-concatenating them bare.
  • The pinned term must be a fully qualified field reference. Reject an ambiguous one at lint rather than at call time.
  • An empty caller filter yields (<pinned>) alone rather than a trailing AND ().

Independent support for the shape

SigNoz already does this composition internally. signoz_aggregate_logs's own filter documentation says the expression is "Combined with service/severity params using AND." So the vendor conjoins an out-of-band constraint onto a caller expression as ordinary behaviour. The difference is that it controls both sides, which is exactly what a declared join gives the guardfile.

What still needs Kai, and what no longer does

No longer blocked on: whether a safe conjunction is expressible in this grammar. It is, and the construction is above.

Still hers: whether a declared-join mechanism is acceptable at all on a surface an agent with public output reaches, given that correctness now rests on the runtime always parenthesising and always qualifying. That is a risk-appetite call rather than a research question.

Unchanged regardless: signoz_list_services takes no filter and enumerates the workspace by design, so no argument pin bounds it. It stays out of any allowlist.

Consumer is still coilyco-bridge/deploy#359. Labels unchanged at priority/P4 autonomy/async-consult role/engineer role/ops until Kai answers the remaining half, at which point this becomes autonomy/headless.

**The SigNoz filter-grammar read this was waiting on. Measured against the live workspace rather than reasoned about. Darren (director seat), 2026-08-17, at Kai's question.** Kai asked whether the problem is SigNoz's data format against umbra's config language. It is two problems, and the format one is the easier half. ## A. The shape gap, which is a config-language problem Against SigNoz's HTTP API the scope filter lives nested at `compositeQuery.builderQueries[].filters.items[]`. Umbra can `set` fixed body values and remap fields, and has no construct that reaches a nested array element. That is a genuine grammar gap and it is the same **class** as the missing `header` node in umbra#303 or the `raw-response` node that just landed: a bounded addition, not a design problem. ## B. The composition gap, which is not a format problem at all Against the tool surface, `filter` is a free-form boolean expression. From the tool schema, verbatim: > Filter expression using SigNoz search syntax. **Combine conditions with AND, OR, and parentheses for precedence.** Conjoining the operator's term with the caller's is therefore string surgery on an expression grammar. Umbra could hold and transport the string perfectly and still produce a wrong query, so this is a language operation rather than a serialization one. **This is the actual blocker.** ## The failure, demonstrated live Naive conjunction, operator term prepended with `AND`: ``` k8s.namespace.name = 'sirens-deep' AND severity_text = 'ERROR' OR severity_text = 'WARN' ``` grouped by namespace over 6h: ``` observability 14660 agent-proxy 60 signoz-mcp 24 sirens-deep 21 ``` Four namespaces. The pinned one contributed **21 of 14,765 rows, so 99.86% of the result escaped the pin.** No error, no warning about scope. Standard precedence binds `AND` tighter than `OR`, so it parsed as `(ns AND severity) OR (severity)` and the second disjunct is unbounded. That is the silent widening Olaf refused to build on spec, and he was right to. ## The fix, also demonstrated Wrap both sides: ``` (resource.k8s.namespace.name = 'sirens-deep') AND (severity_text = 'ERROR' OR severity_text = 'WARN') ``` ``` sirens-deep 21 ``` One namespace. Parenthesising both operands makes the conjunction provably narrowing for any boolean expression language with standard precedence, and SigNoz's own documentation states parentheses are supported for precedence. ## A third hazard the run surfaced, which reading could not The first query returned a backend warning: > Key `k8s.namespace.name` is ambiguous, found 2 different combinations of field context / data type: `context=resource` and `context=attribute`. Using `resource` context by default. So the same key name exists in two contexts. An operator pinning `k8s.namespace.name` and a caller filtering `attribute.k8s.namespace.name` would be constraining **different fields**, and the pin would bound nothing. The second query used `resource.k8s.namespace.name` and the warning disappeared. **A pin must therefore use a fully qualified field name.** An unqualified pin is a second silent-widening vector, distinct from the precedence one. ## What the declared join should be Option 2 from this thread, now concrete: * The guardfile declares the join operator per tool, and the runtime **refuses any tool whose pinned field has no declared join**. Fails closed on the unknown case. * The runtime emits `(<pinned>) AND (<caller>)`, parenthesising **both** operands unconditionally, never string-concatenating them bare. * The pinned term must be a fully qualified field reference. Reject an ambiguous one at lint rather than at call time. * An empty caller filter yields `(<pinned>)` alone rather than a trailing `AND ()`. ## Independent support for the shape SigNoz already does this composition internally. `signoz_aggregate_logs`'s own `filter` documentation says the expression is *"Combined with service/severity params using AND."* So the vendor conjoins an out-of-band constraint onto a caller expression as ordinary behaviour. The difference is that it controls both sides, which is exactly what a declared join gives the guardfile. ## What still needs Kai, and what no longer does **No longer blocked on:** whether a safe conjunction is expressible in this grammar. It is, and the construction is above. **Still hers:** whether a declared-join mechanism is acceptable at all on a surface an agent with public output reaches, given that correctness now rests on the runtime always parenthesising and always qualifying. That is a risk-appetite call rather than a research question. **Unchanged regardless:** `signoz_list_services` takes no filter and enumerates the workspace by design, so no argument pin bounds it. It stays out of any allowlist. Consumer is still `coilyco-bridge/deploy#359`. Labels unchanged at `priority/P4` `autonomy/async-consult` `role/engineer` `role/ops` until Kai answers the remaining half, at which point this becomes `autonomy/headless`.
coilyco-ops commented 2026-08-17 04:38:05 +00:00
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Closing. Kai has ruled logs out of the SigNoz grant permanently, which removes the only consumer this issue's remaining half had. Darren (director seat), 2026-08-17.

This reverses my own disposition from earlier today. I kept it open specifically because coilyco-bridge/deploy#359 was blocked on it, and said so. That premise is gone.

Kai's call

no logs, probably ever

So deploy#359 becomes a traces-and-metrics grant. Both signals have a clean per-service handle and are bounded by the exact-value pins that already shipped in a328d5e, with no conjunctive-join mechanism at all:

  • trace service.name includes sirens-deep as one of nine workspace values
  • metric service.name includes sirens-deep as one of ten

Pinning service and filter removes both from the tool schema, leaving only structured narrowing-only arguments. Verified conjunctive: a caller passing a conflicting service against a pinned equality filter returns empty rather than widened.

Logs were the case that needed the join, because logs have no clean per-lane key. With logs out, nothing needs it.

What this issue delivered, which stands

Exact-value argument pins for upstream proxy mode. The pin is applied by the wrapper, the pinned argument leaves the tool schema entirely so the model cannot see or vary it, a caller naming it with a different value is refused rather than silently corrected, and a pin naming a tool outside the allowlist fails at startup. That unblocked deploy#358 and it now unblocks deploy#359.

What is not built, and the evidence for whoever revives it

Per-tool conjunctive pinning with a declared join. Reopen this if a grant ever needs to leave a free-form query-language argument callable. The measurements are in the thread above and are worth not re-deriving:

  • A naive AND conjunction onto a caller filter containing a top-level OR silently widens. Measured on logs: 14,765 rows returned, 21 in the pinned namespace, 99.86% escaped, no error.
  • The same escape exists between SigNoz's own shortcut params and its filter. Measured on traces: 192 spans, 36 in the pinned service, 81% escaped.
  • Parenthesising both operands, (<pinned>) AND (<caller>), is provably narrowing and was demonstrated to hold.
  • Field keys can be ambiguous across resource and attribute context, so a pin must be fully qualified or it bounds nothing. True of k8s.namespace.name on logs and of service.name on metrics.

That is the design, ready to build, waiting only on a consumer.

Not a consumer

deploy#557 and deploy#495 raise raw SPARQL and Overpass QL passthrough. Those are posture questions about whether an unbounded query surface is acceptable at all, not requests to bound one conjunctively. Answering them yes would be accepting the surface, not needing this feature.

Closing as delivered for the case that shipped, and parked for the case that has no consumer.

**Closing. Kai has ruled logs out of the SigNoz grant permanently, which removes the only consumer this issue's remaining half had. Darren (director seat), 2026-08-17.** This reverses my own disposition from earlier today. I kept it open specifically because `coilyco-bridge/deploy#359` was blocked on it, and said so. That premise is gone. ## Kai's call > no logs, probably ever So `deploy#359` becomes a traces-and-metrics grant. Both signals have a clean per-service handle and are bounded by the **exact-value pins that already shipped** in `a328d5e`, with no conjunctive-join mechanism at all: * trace `service.name` includes `sirens-deep` as one of nine workspace values * metric `service.name` includes `sirens-deep` as one of ten Pinning `service` **and** `filter` removes both from the tool schema, leaving only structured narrowing-only arguments. Verified conjunctive: a caller passing a conflicting `service` against a pinned equality filter returns empty rather than widened. Logs were the case that needed the join, because logs have no clean per-lane key. With logs out, nothing needs it. ## What this issue delivered, which stands Exact-value argument pins for upstream proxy mode. The pin is applied by the wrapper, the pinned argument leaves the tool schema entirely so the model cannot see or vary it, a caller naming it with a different value is refused rather than silently corrected, and a pin naming a tool outside the allowlist fails at **startup**. That unblocked `deploy#358` and it now unblocks `deploy#359`. ## What is not built, and the evidence for whoever revives it Per-tool conjunctive pinning with a declared join. Reopen this if a grant ever needs to leave a free-form query-language argument callable. The measurements are in the thread above and are worth not re-deriving: * A naive `AND` conjunction onto a caller filter containing a top-level `OR` silently widens. Measured on logs: 14,765 rows returned, 21 in the pinned namespace, **99.86% escaped**, no error. * The same escape exists between SigNoz's own shortcut params and its `filter`. Measured on traces: 192 spans, 36 in the pinned service, **81% escaped**. * Parenthesising both operands, `(<pinned>) AND (<caller>)`, is provably narrowing and was demonstrated to hold. * Field keys can be ambiguous across `resource` and `attribute` context, so a pin must be fully qualified or it bounds nothing. True of `k8s.namespace.name` on logs and of `service.name` on metrics. That is the design, ready to build, waiting only on a consumer. ## Not a consumer `deploy#557` and `deploy#495` raise raw SPARQL and Overpass QL passthrough. Those are posture questions about whether an unbounded query surface is acceptable at all, not requests to bound one conjunctively. Answering them yes would be accepting the surface, not needing this feature. Closing as delivered for the case that shipped, and parked for the case that has no consumer.
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